BNR/BER ROBUST Series High-Speed Precision Angular Contact Ball Bearings for Machine Tool Spindles

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1 BNR/BER ROBUST Series High-Speed Precision Angular Contact Ball Bearings for Machine Tool Spindles Temperature tolerance and low heat generation Smooth running even during rapid acceleration Higher speed and longer life

2 Features Bearing features indispensable to motorized main spindles temperature tolerance, seizure resistance and low heat generation have been improved to enable higher speeds with minimal thermal deformation. A major trend in the machine tool industry is for higher maximum spindle speeds. In addition, machines are being required to perform a wider variety of tasks and undergo frequent tool changes. Under such conditions, excellent high-speed performance is imperative and spindles must accelerate and decelerate faster. During periods of rapid acceleration or deceleration, spindle bearings are subjected to severe thermal load conditions. These conditions are caused by drastic changes in the ambient environment that result from heat generated by the motor, housing cooling and other factors. Performing well under such conditions and being capable of higher speeds than conventional precision bearings, the ROBUST Series bearings provide solutions for high-speed spindles of the st century. S type (balls and rings: bearing steel) H type (balls: silicon nitride, Si 3 N 4 /rings: bearing steel) These bearings are designed for motorized and non-motorized spindles and feature the optimal internal structure for minimizing heat generation and improving seizure resistance. The H type can be lubricated with grease at speeds where conventional bearings require Oil-Air lubrication. Additionally, both the S type and H type are capable of speeds 0% higher than conventional precision angular contact ball bearings. X type (balls: silicon nitride, Si 3 N 4 /rings: SHX steel) While this hybrid ceramic bearing has the same design as the S and H types, its rings are made of SHX steel, a new steel developed by NSK. SHX has excellent seizure and wear resistance during critical lubrication shortages. Also, its heat resistance is nearly equal to M steel, which is widely used in bearings for jet aircraft engines. With the X type, grease lubrication is feasible at even higher speeds than the H type. In terms of both surface and subsurface fatigue, SHX steel provides longer life. XE type (balls: silicon nitride, Si 3 N 4 /rings: SHX steel/spinshot Technology) XE bearings have the same specifications as the X type, but employ NSK s exclusive Spinshot lubrication system. While previously only oil jet lubrication has been feasible at speeds exceeding,000,000 dmn, the Spinshot lubrication system utilizes a mixture of oil and air to enable the XE type to sustain such speeds. The use of Oil-Air instead of oil jets reduces overall costs by allowing the structure of the spindle to be simplified and cutting down on the consumption of oil, an added environmental benefit. * Please note that the XE type is not dimensionally interchangeable with conventional precision angular contact ball bearings.

3 BNR/BER ROBUST Series High performance X XE Spinshot XE Type Suitable for silent operation due to reduced air-noise achieved through Oil-Air lubrication design. Material of Inner/Outer Rings: Special High speed Steel SHX Ceramic balls Cage selection based on speed requirements Outer Ring Guided Phenolic cage: up to.5 million d m n.; Outer Ring Guided PEEK cage: over.5 million d m n. ROBUST Series X Type High performance bearings demonstrating high wear and seizure resistance at ultra high speed operation. Material of Inner/Outer Rings: Special High speed Steel SHX Ceramic balls Outer Ring Guided Phenolic cage H ROBUST Series H Type High performance bearings that combine high speed operation with low heat generation. Material of Inner/Outer Rings: SUJ Ceramic balls Cage selection based on speed requirement Ball Guided Polyamide cage: up to.4 million d m n.; Outer Ring Guided Phenolic cage: over.4 million d m n. S ROBUST Series S Type Steel ball bearings for optimal cost. Material of Inner/Outer Rings: SUJ Steel balls Cage selection based on speed requirement Ball Guided Polyamide cage: up to.4 million d m n.; Outer Ring Guided Phenolic cage: over.4 million d m n. High speed

4 NSK s Metallurgical Technology and Optimal Design Features of SHX material SHX has similar heat-resistant performance to M, which is used in bearings for jet engines and can operate at temperatures up to 300 C. However, SHX steel provides even better wear and seizure resistance and longer life than M. SHX is the most suitable material for high-speed bearings with EHL lubrication, such as oil-air lubrication or grease lubrication. These conditions are typical of main shaft spindles in machine tools. Bearing fatigue life test PV value, kgf/mm m/s,600, SAE 500 Cumulative failure probability, % Seizure resistance (4-ball test) SHX SAE5 Clean lubrication Test Conditions Bearing: 606 Load condition, 0 P/C: 5 Temperature: 60 C Rotation: 40 min - Oil film parameter (Λ): Life, h M SHX Material 4-ball test Load Driven ball Fixed balls Features of Optimal Internal Design Today, machining involves various cutting conditions within a wide range of speeds. Consequently, spindle temperatures vary widely and cause changes in internal bearing load. The unique design of the ROBUST Series bearings minimizes the adverse effect temperature variation has on internal bearing load. To ensure the accuracy of spindles by minimizing thermal displacement, suppression of bearing dynamic frictional loss is vital. The ROBUST series design controls dynamic frictional loss, reducing heat generation by approximately 0% when compared to conventional bearings at the same speed Temperature rise of outer ring- Measured values (bore diameter: 65 mm; grease lubrication) Conventional bearings ROBUST Series Speed, rpm ( 0 3 ) Improvement of cleanliness Special melting VIM-VAR for aircraft and high-reliability use M High clean SU EP Stee (ISD+SN Used f TAC se Features of ceramic ball angular contact ball bearings Limiting speed is 0% to % higher than steel ball bearings. 40% lower density than steel balls provides lower centrifugal force. Ceramic balls provide reduced operating preload due to lower thermal expansion and less ball slipping. Ceramic balls are % more rigid than steel balls, which provides high-rigidity for main shaft bearings. NSK s improved ceramic ball material provides high-accuracy. Temperature rise, C Test conditions Grease lubrication (Isoflex NBU5) Preload: 96N Bearing= Bore: 65mm Outer diameter: 00mm Ceramic balls Steel balls min - ( 000) Speed d n m Temperature rise of angular contact ceramic ball bearings 3

5 Long Fatigue BNR/BER ROBUST Series Subsurface type fatigue Clean lubricating environment Surface type Contaminated lubricating environment terial Heat treatment Case hardening steel Sealing technology liness Special heat treatment Control of retained Austenite JZ Mass produced steel Nitrogen reinforced solid and melting properties UR treatment Tough against contaminants TF bearings Sealed-Clean bearings for transmissions Sealed-Clean tapered and spherical roller bearings for steel mills NSK standard material l RP) SHX New Tough bearings (NTF) High Tough bearings (HTF) Super Tough bearings (STF) or B/S ries Used for ROBUST series Features of TYN Cage Ball guided polyamide cage reinforced with glass fiber. Better for keeping grease on the outer ring due to space between the cage and outer ring. Low temperature rise (up to.4 million d mn). Noise reduction (under grease lubrication). Potential for reduced run-in procedure time (under grease lubrication). Features of T Cage Phenolic material and design provide stable operation at high speeds (higher than.4 million d mn). For Oil-Air and oil-mist lubrication, an outer ring guided cage enables better oil flow. 4

6 High Speed Precision Angular Contact Ball Bearings Limiting Speed The limiting speeds listed in the Bearing Dimensional Tables are guideline values. They are based on a single bearing that is lightly preloaded by means of a spring and subjected to relatively light loads with good heat dissipation. The limiting speeds with grease lubrication are determined using high-quality grease in appropriate amounts. Those listed for oil lubrication are based on the use of Oil-Air (or oil mist) lubrication. Note: When single bearings are used in duplex, triplex, and quad combinations, or the preload is increased to improve spindle rigidity, limiting speeds will be lower than those listed. Speed Factors ( ) The limiting speed of a matched bearing set operating under position preload conditions is calculated by multiplying the limiting speed of a single bearing in the set by the appropriate adjustment factor listed in the table below. Sample Calculation A customer wants to use 70BNR0HTDBBP4Y (a quad set) at the spindle s tool-side, greased bearings, at 000 rpm. What is the approximate maximum limiting speed for the bearing set with light preload? Obtain the single bearing maximum speed (0000 rpm) for grease from the bearing tables, page 3. Calculate the approximate maximum limiting speed for the DBB set with light preload using the speed factor (5) from the table above, by multiplying the single bearing speed times the speed factor: 0000 x 5 = 00 rpm. Since the customer s spindle speed, 000 rpm, is below the allowable 00 rpm, the customer s choice of bearing and preload appears appropriate. Factors that Change Preload Preload Increase Due to Deformation of Inner Ring Spacer Caused by Nut Clamping Force Preload Increase Due to Centrifugal Force on Balls Preload Increase Due to Inner/Outer Ring Temperature Difference Preload Change Due to Heat Expansion of Balls Initial Preload of Axial Clearance 3 Preload After Mounting Necessary preload force for cutting in low speed Target K A 00N/µm (K A : Axial Stiffness) Proper Preload to Ensure High-Speed Operation Stability in High Speed P x V Criteria P: Contact Pressure Between Balls and Raceway V: Gyro Slip + Spin Slip Velocity Fatigue Life Preload Increase Due to Interference Fits Between Inner Ring and Shaft Preload Increase Due to Expansion of Inner Ring Raceway Due to Centrifugal Force Preload Decrease Due to Deformation of Outer Ring Spacer Due to Compression by Front Cover Preload Decrease Due to a Decrease of Interference Fits by Expansion of Inner Ring and Shaft due to Centrifugal Force ( ) CAUTION: Preload means the preload values after the bearing has been mounted on the spindle. These after mounted pre-load values will change as a result of the shaft fit requirement of high speed operation and spacer deformation due to nut clamping force. In such case, particular in high speed applications, it is necessary to adjust the spacer lengths relative to each other in order to compensate for the changes in preload after bearing mounting. Consult NSK for guidance. 5

7 BNR/BER ROBUST Series Fitting of Bearings The recommended fits under normal operating conditions (inner ring rotation) for machine-tool spindles are shown in the tables below. FITS ( ) ON SHAFTS Bearing Type Shaft O.D. Shaft O.D. ( ) Tolerance Target Interference ( )( 3 ) over incl minimum maximum minimum maximum Main Spindle Bearings T T T T T T FITS ( ) ON HOUSING Bearing Type Housing Bore Housing Bore ( ) Tolerance Target Interference ( )( 3 ) over incl minimum maximum minimum maximum Angular Contact Ball L L Bearing (Fixed side) L L L L L L L 0.00 L Angular Contact Ball L 0.0 L Bearing (Free side) L 0.0 L L 0.05 L L 0.05 L L 0.0 L Notes ( ) The fits data above are general recommendations for machine tool spindles operating under normal conditions (inner ring rotation), and for d m n values less than 800,000. Where d m n = {[(Bearing ID+OD)/]* RPM}. For high-speeds, high loads, or outer ring rotation, consult NSK for fit recommendations. ( ) Use Target Interference when the bearings can be matched to the shaft or housing. Otherwise use Shaft OD and Housing Bore min. & max. for random matching. ( 3 ) T=Interference of tight fit; L=Clearance or loose fit. Spindle Bearing Arrangement Front Cover Outer Spacer Inner Spacer Threaded Nut Housing Shaft 6

8 High Speed Precision Angular Contact Ball Bearings BNR9S, BNR9H, BNR9X Series Preloads and Axial Rigidity for Duplex Bearings Bearing bore diameter BNR9S (8, steel ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) Calculation of Radial Rigidity For duplex pairs, multiply the value of axial rigidity by the factor in TABLE A. TABLE A BNR9H, BNR9X (8, ceramic ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) Calculation for Multiple Bearing Sets For triplex or quad sets, multiply the value of preload or axial rigidity for duplex pairs by the factor in TABLE B. For radial rigidity of triplex or quad sets, first multiply the value of axial rigidity for duplex pairs by the factor in TABLE A. Then multiply this value by the factor in TABLE B. BER9S, BER9H, BER9X Series Bearing bore diameter BER9S (5, steel ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) TABLE B DBD DBB Preload.36 Axial Rigidity.48 Radial Rigidity.54 BER9H, BER9X (5, ceramic ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm)

9 BNR/BER ROBUST Series BNR0S, BNR0H, BNR0X Series Preloads and Axial Rigidity for Duplex Bearings Bearing bore diameter BNR0S (8, steel ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) Calculation of Radial Rigidity For duplex pairs, multiply the value of axial rigidity by the factor in TABLE A. TABLE A BNR0H, BNR0X (8, ceramic ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) Calculation for Multiple Bearing Sets For triplex or quad sets, multiply the value of preload or axial rigidity for duplex pairs by the factor in TABLE B. For radial rigidity of triplex or quad sets, first multiply the value of axial rigidity for duplex pairs by the factor in TABLE A. Then multiply this value by the factor in TABLE B. BER0S, BER0H, BER0X Series Bearing bore diameter BER0S (5, steel ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm) TABLE B DBD DBB Preload.36 Axial Rigidity.48 Radial Rigidity.54 BER0H, BER0X (5, ceramic ball) Preload Axial Rigidity Preload Axial Rigidity Preload Axial Rigidity (N) (N/µm) (N) (N/µm) (N) (N/µm)

10 Tolerances and Permissible Values for Angular Contact Ball Bearings Inner Rings (Class 4) Units : µm V dp Bs d dmp ds V dmp K ia S d S ia V Diameter Series Combined Combined Bs Single Brg 9 0& Single Brgs Brgs () over incl high low high low max max max max max high low max Inner Rings (Class 4Y) () Units : µm V dp Bs d dmp ds V dmp K ia S d S ia V Diameter Series Combined Bs Single Brg Combined 9 0& Single Brgs Brgs () over incl high low high low max max max max max high low max Inner Rings (Special Class 3) (3) Units : µm Bs d dmp ds V dp V dmp K ia S d S ia Combined V Combined Bs Single Brg Single Brgs Brgs () over incl high low high low max max max max max high low max Inner Rings (Class ) Units : µm Bs d dmp ds V dp V dmp K ia S d S ia Combined V Combined Bs Single Brg Single Brgs Brgs () over incl high low high low max max max max max high low max Notes ( ) Applicable to single bearings manufactured for combined bearings. ( ) Class P4Y is an NSK standard with tolerances tighter than class 4. ( 3 ) Class P3 is an NSK standard. Dimensional tolerances are class P4 and running accuracies are Class P. Remarks. The high tolerances for the bores of cylindrical-bore bearings and the low tolerances for the outside diameter are not applicable within a distance of. times the chamfer dimension r (max.) from the side of a ring.. The tolerances and permissible values of ABMA Standard, ABEC 7 and 9 are identical to JIS (ISO) Classes 4 and respectively. The ABMA standard is applicable to angular contact ball bearings. Dimensional tolerances are class P4 and running.

11 BNR/BER ROBUST Series Outer Rings (Class 4) Units : µm V Dp D Dmp Ds Diameter Series V Dmp K ea S D S ea Cs V Cs 9 0& over incl high low high low max max max max max max Same as the value of Bs for the inner ring of the 4 same bearing Outer Rings (Special Class 4Y) () Units : µm V Dp D Dmp Ds Diameter Series V Dmp K ea S D S ea Cs V Cs 9 0& over incl high low high low max max max max max max Same as the value of Bs for the inner ring of the same bearing ~ Outer Rings (Special Class 3) (3) Units : µm D Dmp Ds V Dp V Dmp K ea S D S ea Cs V Cs over incl high low high low max max max max max max Same as the value of Bs for the inner ring of the.5 same bearing Outer Rings (Class ) Units : µm D Dmp Ds V Dp V Dmp K ea S D S ea Cs V Cs over incl high low high low max max max max max max Same as the value of Bs for the inner ring of the.5 same bearing

12 High Speed Precision Angular Contact Ball Bearings Bearing Number 5BNR9S 5BNR9H 5BNR9X 30BNR9S 30BNR9H 30BNR9X 35BNR9S 35BNR9H 35BNR9X 40BNR9S 40BNR9H 40BNR9X 45BNR9S 45BNR9H 45BNR9X BNR9S BNR9H BNR9X BNR9S BNR9H BNR9X 60BNR9S 60BNR9H 60BNR9X 65BNR9S 65BNR9H 65BNR9X 70BNR9S 70BNR9H 70BNR9X 75BNR9S 75BNR9H 75BNR9X 80BNR9S 80BNR9H 80BNR9X 85BNR9S 85BNR9H 85BNR9X BNR9S BNR9H BNR9X 95BNR9S 95BNR9H 95BNR9X 00BNR9S 00BNR9H 00BNR9X 05BNR9S 05BNR9H 05BNR9X 0BNR9S 0BNR9H 0BNR9X 0BNR9S 0BNR9H 0BNR9X Grease Oil-Air approx Boundary Dimensions Limiting Speed (rpm) Nozzle Aim Point Effective Load Centers Abutment Fillet Dimensions Mass (kg) Basic Load Ratings (N) d D B r r Cr C 0r Diameter (A) Distance (b) a Recommended Grease Quantity () (cc/row) d a D a (max) r a (max) ISO 9 series, 8 Contact Angle BNR9S, BNR9H, BNR9X ( ) NSK recommends a 5% grease fill. The values provided reflect this recommendation.

13 BNR/BER ROBUST Series BER9S, BER9H, BER9X rb ra Dynamic Equivalent Load P = XFr + YFa Single, DT DB or DT Nominal Cor* Contact e Fa/Fr e Fa/Fr>e Fa/Fr e Fa/Fr>e Angle ifa X Y X Y X Y X Y Db φ da φ *For i, use for DB and DF and for DT. ISO 9 series, 5 Contact Angle Static Equivalent Load Nominal Single, DT DB or DF Contact Angle X0 Y0 X0 Y P0 = X0Fr + Y0Fa Single or DT mounting when Fr>F + Y0Fa use P0 = Fr Bearing Number d Boundary Dimensions D B r r Basic Load Ratings (N) Cr C 0r Limiting Speed (rpm) Grease Oil-Air Nozzle Aim Point Diameter (A) Distance (b) Recommended Grease Quantity () (cc/row) Effective Load Centers a Abutment Fillet Dimensions d a D a (max) r a (max) Mass (kg) approx. 5BER9S 5BER9H 5BER9X 30BER9S 30BER9H 30BER9X 35BER9S 35BER9H 35BER9X 40BER9S 40BER9H 40BER9X 45BER9S 45BER9H 45BER9X BER9S BER9H BER9X BER9S BER9H BER9X 60BER9S 60BER9H 60BER9X 65BER9S 65BER9H 65BER9X 70BER9S 70BER9H 70BER9X 75BER9S 75BER9H 75BER9X 80BER9S 80BER9H 80BER9X 85BER9S 85BER9H 85BER9X BER9S BER9H BER9X 95BER9S 95BER9H 95BER9X 00BER9S 00BER9H 00BER9X 05BER9S 05BER9H 05BER9X 0BER9S 0BER9H 0BER9X 0BER9S 0BER9H 0BER9X

14 3 High Speed Precision Angular Contact Ball Bearings BNR0S, BNR0H, BNR0X ( ) NSK recommends a 5% grease fill. The values provided reflect this recommendation. Bearing Number 30BNR0S 30BNR0H 30BNR0X 35BNR0S 35BNR0H 35BNR0X 40BNR0S 40BNR0H 40BNR0X 45BNR0S 45BNR0H 45BNR0X BNR0S BNR0H BNR0X BNR0S BNR0H BNR0X 60BNR0S 60BNR0H 60BNR0X 65BNR0S 65BNR0H 65BNR0X 70BNR0S 70BNR0H 70BNR0X 75BNR0S 75BNR0H 75BNR0X 80BNR0S 80BNR0H 80BNR0X 85BNR0S 85BNR0H 85BNR0X BNR0S BNR0H BNR0X 95BNR0S 95BNR0H 95BNR0X 00BNR0S 00BNR0H 00BNR0X 05BNR0S 05BNR0H 05BNR0X 0BNR0S 0BNR0H 0BNR0X 0BNR0S 0BNR0H 0BNR0X Grease Oil-Air approx Boundary Dimensions Limiting Speed (rpm) Nozzle Aim Point Effective Load Centers Abutment Fillet Dimensions Mass (kg) Basic Load Ratings (N) d D B r r Cr C 0r Diameter (A) Distance (b) a Recommended Grease Quantity () (cc/row) d a D a (max) r a (max) ISO 0 series, 8 Contact Angle

15 BNR/BER ROBUST Series BER0S, BER0H, BER0X r b r a Dynamic Equivalent Load Nominal Contact Angle Cor* ifa e Fa/Fr e Single, DT P = XF r + YF a Fa/Fr>e Fa/Fr e DB or DT Fa/Fr>e X Y X Y X Y X Y Db φ da φ *For i, use for DB and DF and for DT. ISO 0 series, 5 Contact Angle Static Equivalent Load Nominal Contact Single, DT DB or DF Angle X0 Y0 X0 Y P 0 = X 0F r + Y0F a Single or DT mounting when Fr>F + Y0Fa use P0 = Fr Bearing Number d Boundary Dimensions D B r r Basic Load Ratings (N) Cr C 0 r Limiting Speed (rpm) Grease Oil-Air Nozzle Aim Point Diameter (A) Diameter (b) Recommended Grease Quantity () (cc/row) Effective Load Centers a Abutment Fillet Dimensions d a D a (max) r a (max) Mass (kg) approx. 30BER0S 30BER0H 30BER0X 35BER0S 35BER0H 35BER0X 40BER0S 40BER0H 40BER0X 45BER0S 45BER0H 45BER0X BER0S BER0H BER0X BER0S BER0H BER0X 60BER0S 60BER0H 60BER0X 65BER0S 65BER0H 65BER0X 70BER0S 70BER0H 70BER0X 75BER0S 75BER0H 75BER0X 80BER0S 80BER0H 80BER0X 85BER0S 85BER0H 85BER0X BER0S BER0H BER0X 95BER0S 95BER0H 95BER0X 00BER0S 00BER0H 00BER0X 05BER0S 05BER0H 05BER0X 0BER0S 0BER0H 0BER0X 0BER0S 0BER0H 0BER0X

16 Worldwide Sales Offices NSK Ltd.-Headquarters, Tokyo, Japan Americas & Europe Department tel: Asia Marketing & Sales Department tel: Africa South Africa: NSK South Africa (Pty) Ltd. Johannesburg tel: (0) Asia and Oceania Australia: NSK Australia Pty. Ltd. Melbourne tel: (03) China: NSK Hong Kong Ltd. Hong Kong tel: Kunshan NSK Co., Ltd. Kunshan tel: Guizhou HS NSK Bearings Co., Ltd. Anshun tel: NSK (Shanghai) Trading Co., Ltd. Shanghai tel: NSK representative office Beijing tel: NSK representative office Shanghai tel: NSK representative office Guangzhou tel: NSK representative office Anshun tel: India: Rane NASTECH Ltd. Chennai tel: , 6534, 65365, 6600 NSK representative office Chennai tel: Indonesia: P.T. NSK Bearings Manufacturing Indonesia Jakarta tel: Korea: NSK Korea Co., Ltd. Seoul tel: NSK Korea Co., Ltd., Changwon Plant Changwon tel: Malaysia: NSK Bearings (Malaysia) Sdn. Bhd. Kuala Lumpur tel: NSK Micro Precision (M) Sdn. Bhd. Kuala Lumpur tel: New Zealand: NSK New Zealand Ltd. Auckland tel: (09) Philippines: NSK representative office Manila tel: Singapore: NSK International (Singapore) Pte Ltd. Singapore tel: (65) NSK Singapore (Pte) Ltd. Singapore tel: (65) 78 7 Taiwan: Taiwan NSK Precision Co., Ltd. Taipei tel: Thailand: NSK Bearings (Thailand) Co., Ltd. Bangkok tel: 0-64~58 Chonburi tel: (038) SNNS Co., Ltd. Chachoengsao tel: (038) 5-343~3 Europe NSK Europe Ltd. (European Headquarters) Maidenhead, England tel: France: NSK France S.A. Paris tel: Germany: NSK Deutschland Gmbh Düsseldorf tel: NSK Steering Systems Europe Ltd. Stuttgart tel: Neuweg Fertigung Gmbh Munderkingen tel: Italy: NSK Italia S.P.A. Milano tel: Poland: NSK Europe Ltd. Warsaw Liaison Office Warsaw tel: , 56 NSK Iskra S.A. Kielce tel: Spain: NSK Spain S.A. Barcelona tel: Turkey: NSK Bearings Middle East Trading Co., Ltd. Istanbul tel: United Kingdom: NSK Bearings Europe Ltd. Peterlee, England tel: NSK European Technology Center., Ltd. Newark, England tel: NSK UK Ltd. Newark, England tel: NSK Steering Systems Europe Ltd. Coventry, England tel: North and South America NSK Americas, Inc. (American Headquarters) Ann Arbor, Michigan, U.S.A. tel: Argentina: NSK Argentina SRL Buenos Aires tel: Brazil: NSK Brasil Ltda. São Paulo tel: Canada: NSK Canada Inc. Toronto tel: Mexico: NSK Rodamientos Mexicana, S.A. de C.V. Mexico City tel: United States of America: NSK Corporation Ann Arbor, Michigan tel: Sales Offices: Ann Arbor, Michigan tel: Cerritos, California tel: NSK American Technical Center Ann Arbor, Michigan tel: NSK Precision America, Inc. Addison, Illinois tel: NSS America Bennington, Vermont tel: NSK Latin America Inc. Miami, Florida tel: (305) NSK Ltd. has a basic policy not to export any products or technology designated as controlled items by export-related laws. When exporting the products in this brochure, the laws of the exporting country must be observed. Specifications are subject to change without notice and without any obligation on the part of the manufacturer. Every care has been taken to ensure the accuracy of the data contained in this brochure, but no liability can be accepted for any loss or damage suffered through errors or omissions. We will gratefully acknowledge any additions or corrections. CAT. No.ROBUST Printed in Canada NSK 003. The contents of this publication are the copyright of the publishers.

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