WBK 08 S - 01 A WBK 25 DF - 31H. Accessories. (For light load) (For high speed and heavy load) 3. Reference number coding

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1 3. Reference number coding (For light load) xample: Product code for support unit ominal size code * WK 8 S - 1 ounting code o code: Fixed support unit S: Simple support unit SF: Simple support unit (for FSS and VF) R: Fixed support unit (support kit for miniature ball screws) o code or : For general use : Low-profile type (only for square type) C: For clean environment use : iniature general-purpose use W: Lost-wax product 1: Square type 11: Round type *) In case of simple support unit, please note that the nominal size code of 12 or less does not strictly represent internal bore of bearing in millimeters. Please refer to the dimensional table for internal bore of bearing. (1) Support Units for Light Load and Small quipment s for light load and small equipment provide both fixed and support side bearing assemblies to support screw shafts. They provide all required parts such as bearing locknuts so that you can mount them directly to SK standard ball screws, of which shaft ends are machined. Please refer to the dimensions listed on the dimension table for the configuration of standard screw shaft ends for SK standard ball screws with blank shaft ends. For ball screws for transfer equipment, you require optional spacers when mounting fixed support side support units. (a) Features Prompt delivery s are standard products. est selection of bearings for your application use support units for fixed support side are equipped with highly rigid angular contact ball bearings that have been assembled with proper preload, and packed with the appropriate volume of grease. On the other hand, clean support units for fixed support side uses low dust emission grease, and low torque special bearings. Sealed deep groove ball bearings are used for simple support side units for both general and clean environment use. (For high speed and heavy load) xample: Product code for support unit WK 25 DF - 31 ominal size code (internal bore of bearing) : igh speed type earing combination code DF: Face to face duplex combination DFD: Face to face triplex combination DFF: Face to face quadruplex combination

2 ccessories s provide everything necessary for mounting ball screws to machines. (Please refer to the table below.) * Do not disassemble fixed support side units as they are equipped with bearings and oil seals. 4, (b) Features of Clean Support Unit Outstanding low dust emission Clean support unit uses "SK clean grease LG2" which has a proven feature of low dust emission. It reduces dust emission to 1/1 of general support units. Low torque It features low torque characteristics because of special bearings. (5% lower than general support unit.) Particle count no./cf Particle size:.1 μm or over, rotational speed: 1 min -1 1 WK1-1 1 WK1-1C Time, hr igh antirust specification Low temperature chrome plating is applied to bearing housings, retaining plates, locknuts and spacers to improve antirust properties. oreover, bolts and snap rings are made of stainless steel. The table below shows the surface treatment of the bearing housing and material of small parts. earing grease Surface treatment and snap ring material Clean support unit Special bearings, LG2 Low temperature chrome plating Stainless steel Dynamic torque, cm Rotational speed: 1 min -1 3 WK1-1 WK1-1C Time, sec ntirust treatment The table on the right shows the surface treatment for the bearing housing, and material of small parts. Fixed support side Simple support side Part o. ame of parts Part o. ame of parts 1 earing housing 5 earing housing 2 Spacer 6 earing 3 Locknut 7 Snap ring 4 with brass pad support unit earings and grease Surface treatment Screws and snap rings ngular contact ball bearings, PS2 lack oxide Standard material

3 Support Unit (Support Units for Light Load and Small quipment) Support Units for Light Load and Small quipment WK**-1 rass pad K d1 S 2-j drill thru T U Tightening torque (reference) [ cm] Locknut WK4-** 1 69 (3) WK6-** (3) WK8-** (3) WK1-** (4) WK12-** (4) WK15-** (4) WK17-** (4) WK2-** (4) WK25-** (6) WK**-1* cf Retaining cover rass pad S C -.5 D d1 W Fixed support side support unit (square type) K L 2-j drill thru 4-j drill thru View S (WK6 15) View S (WK17 2) Q P Q 4-j drill thru Q P Q View S (WK25) 2-j7.8 drill thru (For j8 reamer) Use d 1 C D F L K R 395 WK WK WK6-1 * WK8-1 * WK8-1 Low type WK8-1C * WK WK1-1 Low type WK1-1C WK WK12-1 Low type WK12-1C WK WK15-1 Low type WK15-1C WK WK WK25-1W otes: 1. 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. 4. Deep groove ball bearing and snap ring are also provided for simple support side. (except WK4-1, WK6-1 and WK6-1) T U Counterbore dimensions ass Locknut ttached bearing for screw support side P Q W Y Z (kg) ZZ ZZ VV ZZ ZZ VV ZZ ZZ VV ZZ ZZ VV ZZ ZZ ZZ 5. earings for WK4-1 and WK6-1 are equipped with non-contact metal shield. *1) For retaining cover side of WK6-1, WK8-1 and WK8-1C, there are no seals. 6. Contact SK if the rotational speed is 5 min -1 and below. 396

4 Support Unit (Support Units for Light Load and Small quipment) WK** drill thru. rass pad L K Set piece Q P PCD W D2 d1 jd1g6 d1 C Tightening torque (reference) [ cm] Locknut WK**-11* 45 U 4- drill thru. Y c bore, Z deep PCD W Retaining cover rass pad F L K Set piece Q P Retaining cover WK4-** 1 69 (3) WK6-** (3) WK8-** (3) WK1-** (4) WK12-** (4) WK15-** (4) WK17-** (4) U C d1 jd1g6 jd1 WK2-** (4) WK25-** (6) / 2 / 2 F View - (example 1) (example 2) Fixed support side support unit (round type) Use d 1 C D 1 D 2 L K F WK WK WK6-11* WK8-11 igh-load type WK8-11* 8 WK8-11C* WK1-11 WK1-11C WK12-11 WK12-11C WK15-11 WK15-11C WK WK otes: 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. 3. Deep groove ball bearing and snap ring are also provided for simple support side. (except WK4-11, WK6-11 and WK6-11) U P Q Counterbore dimensions W Y Z ass ZZ ZZ VV ZZ 68VV ZZ 6VV ZZ 62VV ZZ ZZ (kg) Locknut screw 4. earings for WK4-11 and WK6-11 are equipped with non-contact metal shield. *For retaining cover side of WK6-11, WK8-11 and WK8-11C, there are no seals. 5. Contact SK if the rotational speed is 5 min -1 and below. ttached bearing for support side

5 Support Unit (Support Units for Light Load and Small quipment) D D.5 C W W 2-j drill thru. Simple support side support unit (square type) 2-j drill thru..5 C jd2 R/2 R/2 R Counterbore dimensions ass Use d 2 C D R W Y Z (kg) WK8S WK8S-1 Low type WK8S-1C WK1S-1 WK1S-1C WK12S WK12S-1 Low type WK12S-1C WK12SF-1 * WK12SF-1 *1 Low type WK15S WK15S-1 Low type WK15S-1C WK15SF-1 * WK15SF-1 *1 Low type WK17S WK2S WK2SF-1 Low type WK25S-1W WK25SF-1 * otes: 1. Use datum surface for mounting to machine base. 2. For reference o. 12 or lower numbers, note that the reference numbers and inner dimensions of the bearing are different. 3. WK ** SF is a type supporting screw shaft OD. 4. See page 4 for bearing reference number and the basic dynamic load rating in the radial direction. 5. *1 is exclusive for FSS type *2 is exclusive for VF type. jd R/2 R R/2 jd1 Specifications of support unit Fixed support side support unit Simple support side support unit xial direction aximum Radial direction starting earing asic dynamic load Use asic dynamic load Load limit Rigidity torque reference o. rating rating Ca [] [] [/μm] [ cm] C [] WK WK WK WK WK WK WK WK8S-1 66ZZ 2 26 WK8-1 Low type WK8S-1 66ZZ 2 26 WK12SF-1 *1 681ZZ 1 92 WK8-1C WK8S-1C 66VV 2 26 WK WK8S-1 66ZZ 2 26 WK8-11 igh load ZZ 2 26 WK8-11C WK8S-1C 66VV 2 26 WK WK1S-1 68ZZ 3 3 WK12SF-1 *2 61ZZ 5 1 WK1-1 Low type ZZ 3 3 WK1-1C WK1S-1C 68VV 3 3 WK WK1S-1 68ZZ 3 3 WK1-11C WK1S-1C 68VV 3 3 WK WK12S-1 6ZZ 4 55 WK15SF-1 *2 692ZZ 4 35 WK12-1 Low type WK12S-1 6ZZ 4 55 WK15SF-1 *1 692ZZ 4 35 WK12-1C WK12S-1C 6VV 4 55 WK WK12S-1 6ZZ 4 55 WK12-11C WK12S-1C 6VV 4 55 WK WK15S-1 62ZZ 5 6 WK15-1 Low type WK15S-1 62ZZ 5 6 WK2SF-1 *1 684ZZ 4 WK15-1C WK15S-1C 62VV 5 6 WK WK15S-1 62ZZ 5 6 WK15-11C WK15S-1C 62VV 5 6 WK WK17S-1 623ZZ 9 55 WK WK2S-1 624ZZ 12 8 WK25SF-1 *1 65ZZ 1 1 WK WK2S-1 624ZZ 12 8 WK25-1W WK25S-1W 625ZZ 14 WK WK25S-1W 625ZZ 14 WK4R WK6R otes: 1. *1 is exclusive for FSS type. 2. *2 is exclusive for VF type. 3. Permissible axial load is.7 times of limiting axial load. 4

6 Support kits for ball screws for transfer equipment Support kits are for R type ball screw. In case of R12 or larger rolled ball screws, please use support units for general use. Support Unit (Support Units for Light Load and Small quipment) Spacer When using a fixed support unit, it may require an optional spacer to have an effective shoulder surface at where the ball thread is threaded to the end of the shoulder. This is common for the R series for transporting ball screws. jc 2-j3.4 PCD W.5 jd1 rass pad G jd jd2 jdh9 jd Internal Outside Width ass pplicable diameter, d diameter, D (g) support unit WK6K WK6- ** WK8K WK8- ** WK1K WK1- ** WK12K WK12- ** WK15K WK15- ** WK17K WK17- ** WK2K WK2- ** WK25K WK25- ** cu F C d D 1 D 2 F G W U ass (kg) WK4R WK6R Locknut pplicable ball tightening torque tightening torque screw (reference) [ cm] (reference) [ cm] WK4R-11 R (2.5) R81 WK6R-11 R (3) R82 otes: 1. Oscillate bearings slowly so that they fall into place in which run-out of mounting surface is minimal, and then tighten locknut. 2. Support kit is on provisional shaft (bolt) during shipping. 3. When securing support unit on shaft, insert brass pad that is provided with support unit into lock nut hole, and then tighten set screw

7 Support Unit (Support Units for Light Load and Small quipment) Screw shaft end configuration Dimensions of the shaft end configurations for light load and small equipment support units are shown in the table below. When using a spacer with a ball screw for transporting equipment, add the width of the spacer ( from the table of spacer dimensions on page 42) to L 1 dimension below. m 1 jd1g6 jd2h9 C 2 jdn.21 jd3h7 R.2 or less *, or provide recess Fixed support side ml 1 L 1 C 1 h9 applicable zone n nl L 2 R.2 or less, or provide recess Simple support side Radius marked with * above is.15 or less for WK4R-11 and WK6R-11. Fixed support side earing journal Locknut thread Sealing part Chamfer d 1 L 1 m 1 ml 1 d 2 C 1 WK6- ** WK8- ** WK1- ** WK12- ** WK15- ** WK17- ** WK2- ** WK25- ** WK4R WK6R Simple support side earing journal Snap ring groove Chamfer d 3 L 2 n dn nl C 2 WK8S- ** WK1S- ** WK12S- ** WK15S- ** WK17S- ** WK2S- ** WK25S- **