Compact FA Series. NSK Standard Ball Screws

Transcription

1 NSK Standard Ball s ompact Series ompact-nut ball screws with increased speed and low noise for NSK standard. They accommodate a variety of uses, from use in semiconductor equipment to various transfer equipment. xtended series

2 NSK Standard Ball s ompact Series eatures ompact Series has a broad lineup to meet various industrial needs. ow noise and space-compact design is achieved. The compact series of ball screws includes the following types to quickly and easily meet your requirements: - PSS Type which offers various sizes for general use. - USS Type for high accuracy and clean environment use. - SS Type for transfer equipment. Quick delivery Ball screws and support units in the catalog are in stock. IN UP Selection of ball screws Three types of compact Series are available. hoose optimal types for application. NSK Standard Ball s ompact PSS Type for general uses ccuracy grade: 5 grade of JIS xial play: shaft and 8 mm;.5 mm or less shaft mm or over; Page 3, 7 to 3 ompact The outside diameter of the ball nut is as much as 3% smaller than those of existing NSK products, and the low-profile support units especially compatible with the compact series are available. These contribute to more compact design of equipment and devices. 25 mm, lead 5 mm xisting Series ompact Series ompact USS Type for high-accuracy and clean environments ccuracy grade: 3 grade of JIS xial play: ompact SS type for transfer equipment ccuracy grade: t7 grade of JIS xial play:. mm or less Page 4, 31 to 3 Page 5, 37 to 44 omparison of existing Series and ompact Series 13 mm more compact (shaft 2, lead ) High-speed, low-noise Used with the end-deflector recirculation system. Maximum rotational speed of 5 min -1 is achieved, and noise reduced by db compared with the tube recirculation system. The vibration is reduced as well. Noise level db, * Microphone was positioned at a distance of 4 mm for all noise measurements shaft ombinations of screw shaft diameter and lead Unit: mm PSS type USS type SS type Thin plastic seal shafts with diameters of to 25 mm are equipped with a thin layer of sealing, which minimizes spattering of grease and helps to achieve a clean environment. * s with shaft diameters of mm or 8 mm are not sealed. rease fitting 55 5 xisting Series ompact Series eeding speed V, m/min grease fitting (M5.8) is provided as a standard equipment for shaft of to 25 mm. Two lubrication ports are provided to facilitate easy maintenance. Support Unit Shape Square type Round type pplications or general uses or clean uses Space-saving (low-profile type) or general uses or clean uses Page 45 to 5 1 2

3 ompact Series PSS Type for eneral Uses pplications Semiconductor manufacturing equipment, D manufacturing equipment, material handling equipment, measuring equipment, medical equipment etc. ccuracy grade and axial play ccuracy grade: 5 grade of JIS xial play 1) and 8 mm:.5 mm or less 2) mm or over: (Oversize ball preload) Wide variation bundant combinations of shaft diameter, lead and stroke are available to meet a wide range of customer needs. end support The low-profile support units especially compatible with the compact series are available. Since the ends of ball screw shafts are shaped to accommodate the shapes of support units, no detailed design after purchase is necessary. Support unit ompact Series USS Type for High-ccuracy and lean Uses pplications lean uses for semiconductor manufacturing equipment, D manufacturing equipment, inspection equipment etc. ccuracy grade and axial play ccuracy grade: 3 grade of JIS xial play: (Oversize ball preload) ow-dust emissions Dust particles are reduced by 9% compared with general lithium grease since NSK clean grease 2 is used as a standard. ow-dust emissions (2 rease) 1/ of dust emissions comparing with existing series Ideal for clean environmental use due to superb low-dust feature ombinations of shaft diameter, lead and stroke Stroke (overall shaft length for shaft and 8 mm) Recommended support unit Page ixed Simple 8 7 to 8 9 to xisting support unit to 13 to 14 to to to 3 WBK4-1M (square) WBK4-11M (round) WBK-1M (square) WBK-11M (round) WBK8-1B WBK8-1B WBK-1B WBK-1B WBK-1B WBK2-1 ow-profile support unit - - WBK8S-1B WBK8S-1B WBKS-1B WBKS-1B WBK2S-1 Dust particle amount (.1 μm or larger) [particles/28.3 litle] 1 1 end support ow-profile support unit especially compatible with ompact Series and support unit for clean environments are available. Ball screw 5 Rotational speed 1 min Time, h 5 Series (eneral grease) ompact USS type (2 rease) ombinations of screw shaft diameter, lead and stroke Stroke Recommended support unit Page ixed Simple pplication 31 to to to 3 Dust particle amount (.5 μm or larger) [particles/28.3 litle] 1 1 Ball screw 5 Rotational speed 1 min -1 Series (eneral grease) ompact USS type (2 rease) Time, h WBK8-1B WBK8S-1B ow WBK8-1 WBK8S-1 lean WBK8-1B WBK8S-1B ow WBK8-1 WBK8S-1 lean WBK-1B WBKS-1B ow WBK-1 WBKS-1 lean Reference number ompact PSS type shaft length (mm) Reference number ompact USS type shaft length (mm) xample PSS 5 N1D 31 xample USS 5 N1D 31 shaft diameter (mm) (mm) NSK control number shaft diameter (mm) (mm) NSK control number 3 4

4 ompact Series SS Type for Transfer quipment pplications Transfer equipment for abundant industrial fields such as automobile, semiconductor, food and medical equipment. ccuracy grade and axial play ccuracy grade: t7 grade of JIS xial play:. mm or less asy stroke setting lexible stroke setting with fixed-simple support by means of mounting support unit (simple support side) directly onto ball screw thread outside diameter. Since corner cutting is not necessary, it is easy for customers to cut the screws, which contributes to reduction in cost and lead time. If necessary, NSK will accept orders for cutting. Precautions During the cutting process, be careful not to let metal particles or burrs fall inside the nuts. ustomers are also advised to treat the cut surface. When inserting the support unit (simple support side), apply oil or grease on the outside of the shaft and inside the bearing. end support ixed side: Simple side: Reference number ombinations of shaft diameter, lead and shaft length Overall shaft length Recommended support unit Page ixed Simple 37 to 38 WBK8-1B WBKS-1B 2 25 The low-profile support units especially compatible with the compact PSS type are available. Proprietary support units are available. Design precautions 39 to 4 WBK-1B WBKS-1B 2 41 to 42 2 WBK-1B WBK2S-1B 2 43 to 44 WBK2-1 WBK25S-1 25 ompact SS type asy stroke setting by cutting the shaft end and burring. Permissible rotational speed varies when using cut screw shaft. It is necessary to calculate two items below, and whichever smaller is the permissible rotational speed. ritical speed which is the resonance vibration of the shaft. (Refer to the technical description of the catalog "Precision Machine omponents".) Maximum rotational speed 5 min -1 xample SS N1D shaft length (mm) Design (1) If a ball screw of which left shaft end (opposite driven side) is the shape I, and is supported with the fixed-fixed" supporting method, you should be aware that the operating life of support bearings may drop due to thermal expansion of the screw shaft, depending on usage conditions. In this case, you should consider a structure that can absorb thermal expansion of the screw shaft if necessary. Please consult with NSK for a detailed examination. (2) If using an NSK linear guide, the maximum speed of a linear guide of standard specifications under ordinary conditions is limited to m/min. linear guide with high-speed specifications is available if higher operating speed is required. ontact NSK for further information. (3) or general precautions concerning ball screws, please see NSK atalog No. 312 "Precision Machine omponents." Usage and handling Ball screws are precision products and should be treated as follows: [ubrication] (1) ompact Series ball screws are packed and coated with lubrication grease at the factory, and require no further lubrication under ordinary circumstances. If the surface of the grease becomes contaminated with dirt and metal powder under operation, clean it with white kerosene and replenish with new grease of the same kind through the oil hole (grease fitting) on the ball nut. void mixing different types of grease. heck lubrication (2) ubricant should be checked after the first 2 to 3 months of operation. If excessively dirty, we recommend you wipe away the old grease and replenish with a generous quantity of grease. fter that, grease should be checked and replenished once a year under ordinary circumstances, but the period may vary depending upon the service environment. [Handling] (1) Never disassemble the ball screw, otherwise dirt may contaminate the inside of the unit and affect precision or result in equipment failure. (2) ompact Series ball screws incorporate a new ball re-circulation system. onsequently, only NSK authorized plants should conduct disassembly and reassembly. If the nut accidentally comes off the screw shaft or is dropped, NSK will check precision, problems or perform repairs at your expense. Do not disassemble (3) When the ball screw is erected upright, the screw shaft or nut could fall by force of its own weight and result in injury. If dropped, the ball grooves could be dented or recirculation parts damaged, resulting in loss of function. This would require the ball screw to be inspected by NSK. If so, be sure to send the ball screw to NSK and we will check it for a fee. Beware of dropping [Usage] (1) Ball screws should be used in a clean environment. The ball screws should be provided with a dust cover to prevent the entry of debris such as dust and metal powder. If foreign matter is allowed to contaminate the ball screw, this could not only cause the ball screw to lose some of its function, but also result in clogging and damaging the re-circulation Dust control system parts, or cause the table to fall or a similar serious accident. (2) ompact Series ball screws are designed to be used in a service temperature 8 environment of 8 or lower. Do not allow the service temperature limit to be exceeded. Max In some cases, using ball screws in temperatures above 8 might lead to damage of re-circulation system parts or seal parts. ontact NSK if 8 must be exceeded. aution max. temperature ompact Series options Precautions onsult with NSK for information about such as shaft end machining, reverse direction and alternative preload. shaft diameter (mm) (mm) NSK control number 5

5 ompact Series PSS Type for eneral Uses shaft diameter mm, 8 and mm M h 2-3.4drill thru (equally spaced) PD 21 Ball /screw shaft root 1.2 / 4.9 Ball circle.2 ccuracy grade/axial play 5/.5 mm or less actory-packed grease NSK grease PS2 PSS t quenching range ross-section or drive side (ixed) WBK4-1M (square) P 45 WBK4-11M shaft ffective turns of balls shaft Basic load ratings (N) accuracy Nut dimensions Stroke length Static max. Target value rror Variation preload Mass Permissible rotational speed d l a a t 1 T e p V u (N cm) (kg) (min -1 ) 1 (cm 3 ) (cm 3 ) PSS8ND PSS8NBD or less 5 PSSND PSSNBD ontact NSK if permissible rotational speed is to be exceeded. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 48 for details. Internal spatial nut Standard grease replenishing 7 8

6 ompact Series PSS Type for eneral Uses shaft diameter 8 mm, and mm M h drill thru (equally spaced) PD 25 Ball /screw shaft root /. Ball circle 8.3 ccuracy grade/axial play 5/.5 mm or less actory-packed grease NSK grease PS2 PSS. 4 8 t quenching range ross-section or drive side (ixed) WBK-1M (square) P 45 WBK-11M shaft Internal Basic load ratings (N) accuracy Permissible ffective Nut dimensions spatial Stroke preload Mass rotational turns length Static max. Target value rror Variation speed of balls nut d l a a t 1 T e p V u (N cm) (kg) (min -1 ) 1 (cm 3 ) (cm 3 ) shaft PSS8ND PSS8NBD or less 5 PSS8ND PSS8NBD ontact NSK if permissible rotational speed is to be exceeded. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 48 for details. Standard grease replenishing 9

7 ompact Series PSS Type for eneral Uses shaft diameter mm, 5 and mm g t quenching range 5 a M h drill thru PD Preload type Oversize ball (P-preload) Ball /screw shaft root 2. / 8.2 Ball circle.3 ccuracy grade/axial play 5 / actory-packed grease NSK grease PS2 or drive side (ixed) WBK8-1B (square, low) P 45 WBK8-11 WBK8-11B (round, high-load) P 47 or opposite to drive side (Simple) WBK8S-1B (square, low) P 49 PSS PSS5N1D171 shaft Basic load ratings (N) Static Nominal Stroke Max. Nut length shaft dimensions Target value accuracy d l a a t - t a T e p V u (N cm)* 1 (kg) ixed-simple (cm 3 ) (cm 3 ) PSS5N1D to PSS5N1D to rror Variation preload Mass to PSS5N1D to PSS5N1D to PSSN1D to PSSN1D to PSSN1D to PSSN1D to Permissible rotational speed (min -1 )* 2 5 Internal spatial nut.8.7 Standard grease replenishing.4 1. Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 48 for details. 11

8 ompact Series PSS Type for eneral Uses shaft diameter mm, 5,, 2 and 3 mm g t quenching range a M h drill thru 8 c'bore 4.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root 2. /.2 Ball circle.3 ccuracy grade/axial play 5 / actory-packed grease NSK grease PS2 or drive side (ixed) WBK8-1B (square, low) P 45 WBK8-11 or opposite to drive side (Simple) WBK8S-1B (square, low) P 49 PSS WBK8-11B (round, high-load) P 47 PSS5N1D171 Basic load Stroke shaft dimensions accuracy Permissible Internal ratings (N) Nut rotational spatial preload Mass length Target speed Static Max. rror Variation Nominal value (min -1 )* 2 nut d l a a t - t a 1 T e p V u (N cm)* 1 (kg) ixed-simple (cm 3 ) (cm 3 ) shaft to PSS5N1D to PSS5N1D to PSS5N1D to PSS5N1D to 4.3. PSS5N1D to PSSN1D to PSSN1D to PSSN1D to PSSN1D to 4.3. PSSN1D to PSS2N1D to PSS2N1D to PSS2N1D to 4.9. PSS2N1D to PSS2N1D to PSS3N1D to PSS3N1D to 4.9. PSS3N1D to PSS3N1D to PSS3N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details Standard grease replenishing

9 ompact Series PSS Type for eneral Uses shaft diameter mm, 5 and mm Shape II Shape I M g. 2 thin plastic seal (synthetic plastic). 11 t quenching range a M 1..9 h ross-section drill thru 9.5 c'bore 5.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root /. Ball circle.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK-1B (square, low) P 45 WBK-11 (round) P 47 WBK-1B (square, low) P 45 WBK-11 WBKS-1B (square, low) P 49 PSS PSS5N1D211 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Permissible Nut end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 Static Max. rror Variation Nominal driven value nut d l a a t - t a side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) shaft to.9.5 PSS5N1D to.9.5 PSS5N1D to.9. PSS5N1D to PSS5N1D to PSS5N1D to PSS5N1D to PSSN1D to PSSN1D to PSSN1D to PSSN1D PSSN1D to PSSN1D to PSSN1D to PSSN1D to PSSN1D to Standard grease replenishing Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 1

10 ompact Series PSS Type for eneral Uses shaft diameter mm, 2 and 3 mm Shape II Shape I M g. 2. t quenching range M 1..9 h drill thru 9.5 c'bore 5.5 depth PD 43 2 Preload type Oversize ball (P-preload) Ball /screw shaft root /.2 Ball circle.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK-1B (square, low) P 45 WBK-11 (round) P 47 WBK-1B (square, low) P 45 WBK-11 WBKS-1B (square, low) P 49 PSS 3 a 45 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Standard Permissible Nut shaft end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 grease Static Max. rror Variation Nominal driven value nut replenishing d l side) a a t - t a 1 T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to PSS3N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

11 ompact Series PSS Type for eneral Uses shaft diameter 2 mm, 5 and mm Shape II Shape I.17 M g. 2 thin plastic seal (synthetic plastic) t quenching range a M h ross-section 4-. drill thru 11 c'bore.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root / 17.2 Ball circle 2.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK-1B (square, low) P 45 WBK-11 WBK-1B (square, low) P 45 WBK-11 WBKS-1B (square, low) P 49 PSS PSS25N1D323 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Permissible Nut end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 Static Max. rror Variation Nominal driven value nut d l a a t - t a side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) shaft to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to Standard grease replenishing Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 19 2

12 ompact Series PSS Type for eneral Uses shaft diameter 2 mm, 2 and 3 mm Shape II.17 M 1. Shape I g t quenching range a M h drill thru 11 c'bore.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root / 17.2 Ball circle 2.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK-1B (square, low) P 45 WBK-11 WBK-1B (square, low) P 45 WBK-11 WBKS-1B (square, low) P 49 PSS PSS22N1D58 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Standard Permissible Nut shaft end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 grease Static Max. rror Variation Nominal driven value nut replenishing d l a a t - t a 1 side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) to PSS22N1D to PSS22N1D to PSS22N1D to PSS22N1D to PSS22N1D PSS22N1D to PSS22N1D to PSS22N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to PSS23N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded to Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

13 ompact Series PSS Type for eneral Uses shaft diameter 2 mm, 4 and mm Shape II.17 M 1. Shape I g t quenching range a M h drill thru 11 c'bore.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root / 17.2 Ball circle 2.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK-1B (square, low) P 45 WBK-11 WBK-1B (square, low) P 45 WBK-11 WBKS-1B (square, low) P 49 PSS PSS24N1D58 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Standard Permissible Nut shaft end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 grease Static Max. rror Variation Nominal driven value nut replenishing d l side) a a t - t a 1 T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) PSS24N1D to PSS24N1D to.8 2. PSS24N1D to PSS24N1D to PSS24N1D to PSS24N1D to PSS2N1D to PSS2N1D to PSS2N1D to to PSS24N1D to PSS24N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to PSS2N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

14 ompact Series PSS Type for eneral Uses shaft diameter 25 mm, 5 and mm Shape II Shape I M g t quenching range a M h drill thru PD 51 PD 47 Preload type Oversize ball (P-preload) Ball /screw shaft root / 22.2 Ball circle 25.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK2-1 (square) P 45 WBK2-11 WBK2-1 (square) P 45 WBK2-11 WBK2S-1 (square) P 49 PSS PSS255N1D349 Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Permissible Nut end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 Static Max. rror Variation Nominal driven value nut d l a a t - t a side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) shaft to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to PSS25N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 5 Standard grease replenishing

15 ompact Series PSS Type for eneral Uses shaft diameter 25 mm, 2 and 25 mm Shape II Shape I M g 2 thin plastic seal (synthetic plastic).11 7 t quenching range a M h ross-section -. drill thru PD 51 PD 47 Preload type Oversize ball (P-preload) Ball /screw shaft root / 22.2 Ball circle 25.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK2-1 (square) P 45 WBK2-11 WBK2-1 (square) P 45 WBK2-11 WBK2S-1 (square) P 49 PSS Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Standard Permissible Nut shaft end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 grease Static Max. rror Variation Nominal driven value nut replenishing d l a a t - t a 1 side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) PSS252N1D to PSS252N1D to PSS252N1D to PSS252N1D to PSS252N1D to PSS252N1D to PSS252N1D to PSS252N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to PSS2525N1D to Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 28

16 ompact Series PSS Type for eneral Uses shaft diameter 25 mm, 3 and 5 mm Shape II Shape I M g 2 thin plastic seal (synthetic plastic).11 7 t quenching range a M h ross-section -. drill thru PD 51 PD 47 Preload type Oversize ball (P-preload) Ball /screw shaft root / 22.2 Ball circle 25.5 ccuracy grade/axial play 5 / actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (ixed) (Simple) WBK2-1 (square) P 45 WBK2-11 WBK2-1 (square) P 45 WBK2-11 WBK2S-1 (square) P 49 PSS Basic load ratings (N) Stroke shaft dimensions eft shaft accuracy Internal Permissible Nut end spatial preload Mass rotational speed length (opposite Target (min -1 )* 2 Static Max. rror Variation Nominal driven value nut d l a a t - t a 1 side) T e p V u (N cm)* 1 (kg) ixed-simple ixed-ixed (cm 3 ) (cm 3 ) shaft PSS253N1D to PSS253N1D to PSS253N1D to PSS253N1D to PSS253N1D to PSS253N1D to PSS253N1D to PSS253N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to PSS255N1D to Standard grease replenishing Indicates ball screw preload control value. pproximately 2. N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 29 3

17 ompact Series USS Type for High-ccuracy and lean Uses shaft diameter mm, 5 mm g Basic load ratings (N) Stroke shaft dimensions accuracy Permissible Internal rotational spatial preload Mass Target speed Static Max. rror Variation Nominal value (min -1 )* 2 nut d l a a t - t a T e p V u (N cm)* 1 (kg) ixed-simple (cm 3 ) (cm 3 ) shaft t quenching range 5 a M h drill thru 8 c'bore 4.5 depth USS5N1D to USS5N1D to 2..3 USS5N1D to PD Standard grease replenishing Preload type Oversize ball (P-preload) Ball /screw shaft root 2. / 8.2 Ball circle.3 ccuracy grade/axial play 3 / actory-packed grease NSK clean grease 2 or drive side (ixed) or opposite to drive side (Simple) WBK8-1B (square, low) P 45 WBK8S-1B (square, low) P 49 WBK8S-1 (square, clean) WBK8-11 P 49 WBK8-1 (square, clean) P 45 WBK8-1 (round, clean) P 47 USS 1. Indicates ball screw preload control value. pproximately.5 N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

18 ompact Series USS Type for High-ccuracy and lean Uses shaft diameter mm, 5 mm g. 2 thin plastic seal (synthetic plastic) t quenching range a M h ross-section drill thru 8 c'bore 4.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root 2. /.2 Ball circle.3 ccuracy grade/axial play 3 / actory-packed grease NSK clean grease 2 or drive side (ixed) or opposite to drive side (Simple) WBK8-1B (square, low) P 45 WBK8S-1B (square, low) P 49 WBK8S-1 (square, clean) WBK8-11 P 49 WBK8-1 (square, clean) P 45 WBK8-1 (round, clean) P 47 USS Basic load ratings (N) Stroke shaft dimensions accuracy Permissible Internal rotational spatial preload Mass Target speed Static Max. rror Variation Nominal value (min -1 )* 2 nut d l a a t - t a T e p V u (N cm)* 1 (kg) ixed-simple (cm 3 ) (cm 3 ) shaft USS5N1D to USS5N1D to 2..3 USS5N1D to 3..7 Standard grease replenishing Indicates ball screw preload control value. pproximately.5 N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

19 ompact Series USS Type for High-ccuracy and lean Uses shaft diameter mm, 5 mm g..8 2 thin plastic seal (synthetic plastic) t quenching range a M 1..9 h ross-section drill thru 9.5 c'bore 5.5 depth PD Preload type Oversize ball (P-preload) Ball /screw shaft root /. Ball circle.5 ccuracy grade/axial play 3 / actory-packed grease NSK clean grease 2 or drive side (ixed) or opposite to drive side (Simple) WBK-1B (square, low) P 45 WBKS-1B (square, low) P 49 WBKS-1 (square, clean) WBK-11 P 49 WBK-1 (square, clean) P 45 WBK-1 (round, clean) P 47 USS USS5N1D21 Basic load ratings (N) Stroke shaft dimensions accuracy Permissible Internal rotational spatial preload Mass Target speed Static Max. rror Variation Nominal value (min -1 )* 2 nut d l a a t - t a T e p V u (N cm)* 1 (kg) ixed-simple (cm 3 ) (cm 3 ) shaft to 5..5 USS5N1D to USS5N1D to..9 USS5N1D to Standard grease replenishing Indicates ball screw preload control value. pproximately.5 N cm of is added due to thin plastic seals. 2. ontact NSK if permissible rotational speed is to be exceeded. 3. Service temperature range is to 8º. 4. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 35 3

20 ompact Series SS Type for Transfer quipment shaft diameter mm, mm g g 2 thin plastic seal (synthetic plastic) (7) 11 (8.7) t quenching range a (3) (8.1) M h drill thru 8 c'bore 4.5 depth PD Ball /screw shaft root 2. /.2 Ball circle.3 ccuracy grade/axial play t7 /. or less actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (Simple) WBK8-1B (square, low) WBKS-1B (square, low) P 45 P 5 SS ross-section shaft Basic load ratings (N) shaft dimensions accuracy Static Target value rror Variation Mass Internal spatial nut d l a a t a T e p V 3 (kg) (cm 3 ) (cm 3 ) SSN1D SSN1D SSN1D Standard grease replenishing pproximately 2. N cm of is added due to thin plastic seals. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

21 ompact Series SS Type for Transfer quipment shaft diameter mm, and 2 mm g D1g 2 thin plastic seal (synthetic plastic) D M h drill thru 9.5 c'bore 5.5 depth PD W 2 Ball /screw shaft root / /.2 Ball circle.5 ccuracy grade/axial play t7 /. or less actory-packed grease NSK grease R3 SS B.14 (7) 11 t quenching range a (3) (8.1) (8.7) or drive side or opposite to drive side (ixed) (Simple) WBK-1B (square, low) WBKS-1B (square, low) P 45 P 5 ross-section SSN1D5 shaft Basic load ratings (N) shaft dimensions Nut dimensions accuracy Static d l a a t a 1 D 1 D 2 W B T e p V 3 (kg) (cm 3 ) (cm 3 ) SSN1D SSN1D SS2N1D SS2N1D SS2N1D Target value rror.5 Variation Mass.7.9 Internal spatial nut Standard grease replenishing pproximately 2. N cm of is added due to thin plastic seals. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details. 39 4

22 ompact Series SS Type for Transfer quipment shaft diameter 2 mm, and 2 mm g g 2 thin plastic seal (synthetic plastic).18 (7) 13 t quenching range a (3) (8.1) 2 (8.7) M h ross-section 4-. drill thru 11 c'bore.5 depth PD Ball /screw shaft root / 17.2 Ball circle 2.5 ccuracy grade/axial play t7 /. or less actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (Simple) WBK-1B (square, low) WBK2S-1B (square, low) P 45 P 5 SS SS2N1D shaft Basic load ratings (N) shaft dimensions Nut length accuracy Static Target value rror Variation Mass Internal spatial nut d l a a t a T e p V 3 (kg) (cm 3 ) (cm 3 ) SS2N1D SS2N1D SS22N1D SS22N1D SS22N1D Standard grease replenishing pproximately 2. N cm of is added due to thin plastic seals. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

23 ompact Series SS Type for Transfer quipment shaft diameter 25 mm,, 2 and 25 mm g g 2 thin plastic seal (synthetic plastic).18 (7) (3) 2 (8.1) (8.7) t quenching range a o M h ross-section -. drill thru (PD 51) PD 51 Ball /screw shaft root / 22.2 Ball circle 25.5 ccuracy grade/axial play t7 /. or less actory-packed grease NSK grease R3 or drive side or opposite to drive side (ixed) (Simple) WBK2-1 (square) P 45 WBK25S-1 (square) P 5 SS shaft Basic load ratings (N) shaft dimensions Nut length accuracy Static Target value rror Variation Mass Internal spatial nut d l a a t a 1 T e p V 3 (kg) (cm 3 ) (cm 3 ) SS25N1D SS25N1D SS25N1D SS252N1D SS252N1D SS252N1D SS2525N1D SS2525N1D SS2525N1D Standard grease replenishing pproximately 2. N cm of is added due to thin plastic seals. 2. Service temperature range is to 8º. 3. Use of NSK support unit is recommended. Refer to pages 45 to 5 for details

24 Square Type Support Unit ixed support side support unit (square type) WBK4 and WBK8 to 2 Set screw Brass pad M Retaining cover Set screw K d1 S J S N T U 2- drill thru H View S (WBK4 and ) Tightening (reference) [N cm] ocknut Set screw WBK4-** 9 (M3) WBK-** 19 9 (M3) WBK8-** 23 9 (M3) WBK-** (M4) WBK-** (M4) WBK-** (M4) WBK2-** (M4) Support Unit Brass pad B d1.5 D M W K J N 2- drill thru Y c'bore Z depth H View S (WBK8 to ) 4- drill thru Y c'bore Z depth Q P Q View S (WBK2) Use ounterbore dimensions 45. or WBK4-1M and WBK-1M, non-contact metal seals are installed in both sides of bearings. 4 Mass Basic dynamic load rating Specification d 1 B D J K R T U N H P Q W Y Z (kg) a (N) a (N) (N/µm) (N cm) M WBK4-1M eneral oad limit Rigidity Maximum starting ocknut screw M4.5 - WBK-1M eneral M.75 - WBK8-1 eneral WBK8-1B ow type WBK8-1 lean VV WBK-1 eneral WBK-1B ow type M8 1 ttached bearing for support side ZZ M 1 8ZZ WBK-1 lean VV WBK-1 eneral WBK-1B ow type M 1 ZZ WBK-1 lean VV WBK-1 eneral WBK-1B ow type M 1 2ZZ WBK-1 lean VV WBK2-1 eneral Use datum surface for mounting to machine base. 2. Tighten set screw after locknut has been adjusted and tightened. 3. Insert brass pad provided with unit into locknut set screw hole, then insert and tighten the set screw M2 1 24ZZ 4. Deep groove ball bearing and snap ring are also provided for simple support side. (except WBK4-1M, WBK- 1M) 5. or retaining cover side of WBK8-1 and WBK8-1, there are no seals.

25 Round Type Support Unit ixed support side support unit (round type) WBK4 and U 2- drill thru PD W Set screw Brass pad D J d H K Set screw Brass pad D g N H d Q P ross section - (xample 2) J Tightening (reference) [N cm] ocknut Set screw WBK4-** 9 (M3) WBK-** 19 9 (M3) WBK8-** 23 9 (M3) WBK-** (M4) WBK-** (M4) WBK-** (M4) WBK2-** (M4) Support Unit ross section - (xample 1) WBK8 to drill thru Y c'bore, Z depth W Retaining cover Set screw Brass pad K Set screw Brass pad Q P Retaining cover U d D g d M / 2 / 2 J H View - (xample 1) N H J View - (xample 2) Use ounterbore dimensions Mass Basic dynamic load rating Specification d 1 D 1 D 2 H K N U P Q J W Y Z (kg) a (N) a (N) (N/µm) (N cm) M WBK4-11M eneral M4.5 - WBK-11M eneral M.75 - WBK8-11B High-load ZZ WBK8-11 eneral M8 1 ZZ WBK8-11 lean VV WBK-11 eneral ZZ M 1 WBK-11 lean VV WBK-11 eneral ZZ M 1 WBK-11 lean VV WBK-11 eneral ZZ M 1 WBK-11 lean VV WBK2-11 eneral M2 1 24ZZ 1. Tighten set screw after locknut has been adjusted and tightened. 2. Insert brass pad provided with unit into locknut set screw hole, then insert and tighten the set screw. oad limit Rigidity Maximum starting ocknut screw 3. Deep groove ball bearing and snap ring are also provided for simple support side. (except WBK4-11M and WBK-11M) 4. or retaining cover side of WBK8-11 and WBK8-11, there are no seals. 5. or WBK4-11M and WBK-11M, non-contact metal seals are installed in both sides of bearings. ttached bearing for support side

26 Square Type Support Unit for Simple Support Side Simple support side support unit for PSS and USS types Simple support side support unit for SS type 2- drill thru Y c'bore Z depth W 2- drill thru Y c'bore Z depth W Support Unit.5.5 B d2 d1 B d Use R/2 R/2 R ounterbore Mass dimensions d 2 B R W Y Z (kg) Bearing reference no. xial direction basic dynamic load rating (N) WBK8S-1B ow ZZ 2 2 WBKS-1B ow ZZ 4 55 WBKS-1B ow ZZ 5 ounterbore Mass dimensions d B R W Y Z (kg) Bearing reference no. xial direction basic dynamic load rating (N) WBKS-1B ZZ 1 92 WBKS-1B ZZ 4 35 WBK2S-1B ZZ 4 R / 2 R Note 1. Use datum surface for mounting to machine base. Note 1. Use datum surface for mounting to machine base. 2- drill thru Y c'bore Z depth 2- drill thru Y c'bore Z depth W.5 D B D.5 d B d2 d1 Use W R/2 R/2 R ounterbore dimensions Mass d 2 B D R W Y Z (kg) Bearing reference no. xial direction basic dynamic load rating (N) WBK8S-1 eneral ZZ WBK8S-1 lean VV 2 2 WBKS-1 eneral 8ZZ WBKS-1 lean 8VV 3 3 WBKS-1 eneral ZZ WBKS-1 lean VV 4 55 WBKS-1 eneral 2ZZ WBKS-1 lean 2VV 5 WBK2S-1 eneral ZZ 8 Note ounterbore dimensions Mass d B D R W Y Z (kg) R / 2 R Bearing reference no. xial direction basic dynamic load rating (N) WBK25S ZZ 1. Use datum surface for mounting to machine base. Note 1. Use datum surface for mounting to machine base. 49 5

27 T. No Z-8 NSK td. irst edition published in NOV.29