Compact ball nut heralding in the

• Ball Screws

2. Recommendation of Screw Shaft End Configuration2.1 Drive side shaft end and opposite end: P2.2 Drive side shaft end and opposite end: RScrew shaftDiameter d12152025324050Unit: mmScrew shaftTap holeDiameter d Size M Depth H12 M3×0.5 915 M4×0.7 1020 M6×1 1225 M6×1 1232 M6×1 1240 M8×1.25 1650 M8×1.25 162.3 Opposite to drive side shaft end: S( ): Reference number of bearing2.4 Opposite to drive side shaft end: T( ): Reference number of bearing2.5 Drive side shaft end: C Opposite to drive side shaft end: UUnit: mm168

2.9 Drive side shaft end: A4Unit: mm2.10 Drive side shaft end: A5Unit: mm2.11 SpacerReferencenumberBearingjournalUnit: mmSpacer dimensionsDiameter Bore Diameter Widthd d 4 D EWBK08K 8 8 11.5 5.5WBK12K 12 12 14.5 5.5WBK15K 15 15 19.5 10WBK20K 20 20 25.5 11WBK25K 25 25 32 14170

Rolled Ball Screws R-Series• Short delivery time: R Series is standardized, andavailable in stock.• Interchangeable screw shaft and ball nut: Screw shaftand nut assembly components are sold separately, andrandomly-matched. The maximum axial play after assemblyis shown in the dimension tables.• Low prices: Screw shaft is processed by rolling. This iswhy prices are lower than those of precision types.• Abundant series: There are 128 types of nut assemblycombinations in the series. Each combination has twoto three different lengths in screw shaft.14171

172

Rolled Ball Screws R-SeriesRolled Ball ScrewsNut model Picture group Recirculation system Lead classificationRNFTL Flanged, Return tube type Fine, medium leadTube projecting typeHigh helix leadRNFBL Flanged Circular Return tube type Fine, medium leadV-threadRNCT (no flange) Return tube type Fine leadProjecting tube typeRNSTL Square type Return tube type Small, mediumleadsRNFCL Flanged Circular End cap type High helix leadUltra high helix lead• Short delivery time: R Series is standardized, and available instock.• Interchangeable screw shaft and ball nut: Screw shaft andnut assembly components are sold separately, and randomlymatched.The maximum axial play after assembly is shownin the dimension tables.• Low prices: Screw shaft is processed by rolling. This is whyprices are lower than those of precision types.• Abundant series: There are 128 types of nut assembly combinationsin the series. Each combination has two to threedifferent lengths in screw shaft.173

Rolled Ball Screws R-Series 175

176

Rolled Ball Screws R-Series 177

178

Rolled Ball Screws R-SeriesStandardstockdmφdrφdφL sUnit: mmBall nut dimensionsArborScrew shaftOutsidedia.DFlangeA G BLengthL nBolt holeWXOil holeQProjecting tubeU V R d 0Bore24 44 17 8 44 34 4.5 M3 × 0.5 17 16 5 10.1 8.1 400 800 RS1212A**30 55 22 10 50 43 6.6 M6 × 1 22 22 7 13.6 11.6 500 1000 1500 RS1616A**Outsidedia.d iStandard lengthL sScrew shaft No.35 68 25 12 59 52 9 M6 × 1 25 27 8 17.3 14.9 500 1000 2000 RS2020A**45 80 31 12 69 63 9 M6 × 1 31 32 10 22.0 19.6 1000 2000 2500 RS2525A**55 100 37 15 84 80 11 M6 × 1 37 40 12 28.0 25.6 1000 2000 3000 RS3232A**70 120 46 18 103 95 14 M6 × 1 46 49 15 35.0 31.8 2000 3000 4000 RS4040A**Remarks 4. Nut assembly with arbor and the screw shaft are separated at time of delivery.5. At the end of the screw shaft reference number where marked with "**", fill with the value obtained by dividing thestandard screw shaft length by 100 mm.6. Items in stock are not applied surface treatment. NSK provides treatment such as phosphate coating on request.179

Oil hole QTSeals (both ends)45 °45 °4-X drill thru.DφArborAφdiφ φdodmφdrφBCL nHW 180

Rolled Ball Screws R-Seriesdrill thru.StandardstockdmφdrφdφL sUnit: mmScrew shaftStandard lengthScrew shaft No.BoreBall nut dimensionsArborFlange Length Bolt hole Oil holeOutsidedia.D A H B L (C ) W X Q T d 0 d iL sOveralllength26 42 29 8 36 3 34 4.5 M3 × 0.5 5.0 8.1 6.1 400 800 RS1006A**29 45 32 8 44 3 37 4.5 M3 × 0.5 5.5 9.6 7.6 400 800 RS1208A**31 50 37 10 40 4 40 4.5 M6 × 1 5.0 11.5 9.5 500 1000 RS1404A**32 50 38 10 40 4 40 4.5 M6 × 1 5.0 11.0 9.0 500 1000 RS1405A**50 80 60 12 61 4 65 6.6 M6 × 1 6.0 13.6 11.6 500 1000 1500 RS1808A**40 60 46 10 40 4 50 4.5 M6 × 1 5.0 17.0 14.6 500 1000 2000 RS2005A**52 82 64 12 61 5 67 6.6 M6 × 1 6.0 16.2 13.8 500 1000 2000 RS2010A**Outsidedia.43 67 50 1040554 55 5.5 M6 × 1 5.0 22.0 19.6 1000 2000 2500 RS2505A**60 96 72 1566965 78 9.0 M6 × 1 7.5 19.0 16.6 1000 2000 2500 RS2510A**50 80 60 1247655 65 6.6 M6 × 1 6.0 25.0 22.6 1000 2000 2500 RS2806A**67 103 78 1567975 85 9.0 M6 × 1 7.5 27.0 24.6 1000 2000 3000 RS3210A**70 110 82 1769995 90 11.0 M6 × 1 8.5 30.0 27.6 1000 2000 3000 RS3610A**76 116 88 17 99 5 96 11.0 M6 × 1 8.5 35.0 31.8 2000 3000 4000 RS4010A**Remarks 4. Items in stock are not applied surface treatment. NSK provides treatment such as phosphate coating on request.5. Seal for those with the shaft diameter of 14 mm or less is made of synthetic resin. Seal for those with 16 mm orlarger is "Brush-seal."181

182

Rolled Ball Screws R-Series 183

184

Rolled Ball Screws R-Series 185

Oil hole QArbor30 °30 °4-X drill thru.AφdodiDφdmφdrφφφEBHML nMW 186

Rolled Ball Screws R-Series4-X drill thru.StandardstockdmφdrφdφL sUnit: mmOutsidedia.DBall nut dimensionsFlange LengthA H B E L n MOutsidedia.ArborBolt hole Oil hole BoreW X Q d 0d iStandard lengthL sScrew shaftScrew shaft No.26 44 28 6 9 30 − 35 4.5 M3 × 0.5 10.1 8.1 400 800 RS1212A**33 51 35 10 11 45−342 4.5 M6 × 1 12.2 10.2 500 1000 1500 RS1520A**−32 53 34 10 10 383−42 4.5 M6 × 1 13.6 11.6 500 1000 1500 RS1616A**3−39 62 41 10 11.5 463−50 5.5 M6 × 1 17.3 14.9 500 1000 2000 RS2020A**3−47 74 49 12 13 553−60 6.6 M6 × 1 22.0 19.6 1000 2000 2500 RS2525A**3−58 92 60 12 16 703−74 9 M6 × 1 28.0 25.6 1000 2000 3000 RS3232A**3−73 114 75 15 19.5 85 3.5 −93 11 M6 × 1 35.0 31.8 2000 3000 4000 RS4040A**3.5−90 135 92 20 21.5 107 3.5 −112 14 M6 × 1 44.0 40.8 2000 3000 4000 RS5050A**3.5Remarks 4. Items in stock are not applied surface treatment. NSK provides treatment such as phosphate coating on request.5. The entire length of the nut becomes longer by "2 x M " for those with a seal. The seal is "Brush-seal."187

Oil hole QArbor30 °30 °4-X drill thru.AdodiDφdmdrφφφφφEBHML nMW 188

Rolled Ball Screws R-Series-X drill thru.StandardstockdmφdrφdφL sBall nut dimensionsOutsidedia. Flange LengthD A H B E L n M34−332 50 34 10 10 66−366−341−338 58 40 10 11 81−381−350−341 4.5 M6 × 1 13.5 11.5 500 1000 1500 RS1632A**48 5.5 M6 × 1 17.3 14.9 500 1000 1500 2000 RS2040A**46 70 48 12 13 100 − 58 6.6 M6 × 1 22.0 19.6 1000 2000 2500 RS2550A**3100 − 3−58 92 60 12 15.5 1263−3−ArborBolt hole Oil holeOutsidedia. BoreW X Q d 074 9 M6 × 1 28.0 25.6 1000 2000 3000 4000 RS3264A**73 114 75 15 19 158 3.5 −93 11 M6 × 1 35.0 31.8 2000 3000 4000 5000 RS4080A**3.5Remarks 4. Items in stock are not applied surface treatment. NSK provides treatment such as phosphate coating on request.5. The entire length of the nut becomes longer by "2 x M " for those with a seal. The seal is "Brush-seal."d iUnit: mmScrew shaftStandard length Screw shaftNo.L s189

190

Compact FA Series – E3230Main features:Next-generation compact ball screws offer quiet, high speedoperation performance.A standard stock series assures immediate delivery.15191

Compact & SilentFeatures:6 dB less noiseThe noise level of ball screws has been reduced by 6 dB,about half of what is sensed by the ear. Ball screws subsequentlyproduce a quieter and gentler sound.10%–30% more compact ball nutThe outside diameter of the ball nut is as much as 30%smaller than those of NSK conventional products. This contributesto more compact design of all sorts of equipmentand devices such as thinner XY tables.High-speed operation of up to 5 000 min-1The new ball screws offer 1.6 times faster rotational speed thanconventional ball screws. They handle speeds up to 5 000 min-1.This capability dramatically expands the range of serviceconditions.Note: Please refer to the dimension table for details of permissiblerotational speed.New type of contact sealA new model high-performance contact seal minimizes greasedispersion and helps to maintain a clean work environment.Low-profile designThe low-profile support units especially compatible with thecompact FA series are available for uniquely space-savingdesign.Existing support unit — New low profi le supportGrease fitting provided as standard equipmentThe new ball screws are standardly equipped with a greasefitting (M5 × 0.8). Lubrication ports are provided in 2 placesto facilitate maintenance. The ball screws can be easily connectedto an integrated lubrication system.As much as 30%more compactShaftdiameterLeadStroke50 100 150 200 300 400 500 600 700 800 1 000 1 200 1 600 2 000Recommended support unitFixed sidesupport unitSimple sidesupport unit105 ●●●●●●●●●10WBK08-01B WBK08S-01B5 ● ● ● ● ● ●1210 ● ● ● ● ●20 ● ● ● ● ●WBK08-01B WBK08S-01B30 ● ● ● ● ●5 ● ● ● ● ● ● ●1510 ● ● ● ● ● ● ● ● ●WBK12-01BWBK10-01B WBK12S-01B20 ● ● ● ● ● ● ● ● ●30 ● ● ● ● ● ● ● ● ●5 ● ● ● ● ● ● ● ●10 ● ● ● ● ● ● ● ● ●2020 ● ● ● ● ● ● ● ● ●30 ● ● ● ● ● ● ● ● ●WBK15-01B WBK15S-01B40 ● ● ● ● ● ● ● ● ●60 ● ● ● ● ● ● ● ● ●5 ● ● ● ● ● ● ● ●10 ● ● ● ● ● ● ● ●2520 ● ● ● ● ● ● ● ●25 ● ● ● ● ● ● ● ●WBK20-01 WBK20S-0130 ● ● ● ● ● ● ● ●50 ● ● ● ● ● ● ● ●Other support units are also available. See last page of catalog for details.Noise data(Microphone was positioned at a distance of 400 mmfor all noise measurements.)192

NSK Ball Screws for standard stock Screw shaft: Ø 10 and 12Screw shaft Ø10Lead 5, 10Ball screw specificationPreload typeOversize ball preload (P-preload)Ball diameter/screw shaft root diameter 2.000/8.2Accuracy grade/axial play C5/0Factory pre-packed greaseNSK grease PS2Recommended support unitWBK08-01B (square, fixed side)WBK08S-01B (square, simple side)WBK08-11B (round, fixed side)Reference numberScrewshaftdiameterdLeadBasic load ratings (N)DynamicC aStaticC 0aStrokeMax.NominalL 1-LNutlengthLScrew shaft dimensionsLead accuracyTarget value Error VariationL 1 L 2 L 3 T e p υ uShaft runout, CDynamic preload torque(N·cm) ✽1Permissible rotationalspeed (min –1 ) ✽ 2Fixed-SimplePSS1005N1D0171 50 83 112 125 1710.020 0.018 0.030 0.7 – 3.3PSS1005N1D0221 100 133 162 175 2210.020 0.018 0.045 0.7 – 3.3PSS1005N1D0321 5 2 930 4 790 200 233 29 262 275 3210.023 0.018 0.060 0.6 – 4.3 5 000PSS1005N1D0421 300 333 362 375 4210.025 0.020 0.070 0.6 – 4.3PSS1005N1D0521 10 400 433 462 475 521 0 0.027 0.020 0.085 0.4 – 4.9PSS1010N1D0221 100 130 162 175 2210.020 0.018 0.045 0.7 – 3.3PSS1010N1D032110 1 970 3 010200 23032262 275 3210.023 0.018 0.060 0.6 – 4.35 000PSS1010N1D0421300 330362 375 4210.025 0.020 0.070 0.6 – 4.30.027 0.020 0.085 0.4 – 4.9✽ 1. Indicates ball screw preload control value. About 2.0 N·cm of torque is added due to high performance seal. ✽ 2. Contact NSK if permissible rotational speed is to be exceeded. ✽ 3. Service temperature range is -20˚C to 80˚CScrew shaft Ø12Lead 5, 10, 20, 30Ball screw specificationPreload typeOversize ball preload (P-preload)Ball diameter/screw shaft root diameter 2.000/10.2Accuracy grade/axial play C5/0Factory pre-packed greaseNSK grease PS2193

NSK Ball Screws for standard stock Screw shaft: Ø 15Screw shaft Ø15Lead 5, 10Screw shaft Ø15Lead 20, 30194

NSK Ball Screws for standard stock Screw shaft: Ø 20Screw shaft Ø20Lead 5, 10, 20, 30, 40, 60195

φNSK Ball Screws for standard stock Screw shaft: Ø 25Screw shaft Ø25Lead 5, 10, 20, 25, 30, 50196

NSK Ball Screws for standard stock197

Part No. Part Remarks (surface treatment, grease)Bearing housingTriiron tetroxide film➀Angular contact ball bearing PS2Oil sealCoverTriiron tetroxide film➁ Spacer➂ Lock nut Triiron tetroxide film➃Setscrew Triiron tetroxide film➄ Deep groove ball bearing Comes with support side, PS2➅ Snap ring Triiron tetroxide filmOther machine screws are either made of stainless steel or coarted withtriiron tetroxide film.Part No. Part Remarks (surface treatment, grease)➀ Bearing housing Triiron tetroxide film➁ Deep groove ball bearing PS2➂ Snap ring Triiron tetroxide film198

Low-profile Support Units for Compact FA SeriesFixed side support unit (square type)Simple side support unit199

Compact FA SeriesSquare type and Round typeFixed side support unit (round type)Specifications of support unit200

WBK Support UnitsSupport unitsq ClassificationBall screw support units are classified into categories by theirshape. Select the type that is appropriate for you to use.w Features• Short delivery time: Standardized items in stock• Use most suitable bearingsOn the fixed support side, the angular contact ball bearingis used. It has great rigidity and low friction torquewhich match the rigidity of the ball screw.The thrust angular contact ball bearing with high precisionand great rigidity is another choice for the fixedsupport side.• High dust prevention, and low friction torqueOil seal is installed in small clearance on the fixed supportside. A deep-groove ball bearing with a shield onboth sides is used on the simple support side. This minimizesfriction torque.• Lock nut is provided.A lock nut of fine grade finish is provided to fix thebearing with high precision.16201

202

WBK Support UnitsSupport units1 ClassificationBall screw support units are classified intocategories by their shape (Table I-6.6). Select thetype that is appropriate for you to use.2 Features• Short delivery time: Standardized items in stock• Use most suitable bearingsOn the fixed support side, the angular contact ballbearing is used. It has great rigidity and low frictiontorque which match the rigidity of the ball screw.The thrust angular contact ball bearing with highprecision and great rigidity is another choice for thefixed support side.• High dust prevention, and low friction torqueOil seal is installed in small clearance on the fixedsupport side. A deep-groove ball bearing with ashield on both sides is used on the simple supportside. This minimizes friction torque.• Lock nut is provided.A lock nut of fine grade finish is provided to fix thebearing with high precision.3 Reference number and applicable ball screwSupport unit product code(For light load) WBK 08 S-01Nominal sizeSupport side code No code:Fixed support sideSSF:Simple support sideR:Fixed support side (support kit)Design serial numberNominal size(For heavy load) WBK 25 DF-31Bearing combinationDF (duplex), DFD (triplex), DFF (quadruple)Design serial numberDetails for the new NSK Low Profile Support Units you willfind on page 154 and following.203

The table below show "shaft diameter/lead combinations" of standard ball screws that are applicable tosupport units.Support units for light load and applicable "shaft diameter/lead combinations"Support unit / reference number"Shaft diameter/lead combinations"SquareRoundof standard ball screwsFixed support side Simple support sidethat are applicable to support unitFixed support side(driving motor side) (opposite to driving motor)WBK06-01A − WBK06-11 φ4 × 1, φ6 × 1Light load / small equipmentWBK08-01A WBK08S-01 WBK08-11 φ8 × 1, φ8 × 1.5, φ8 × 2, φ10 × 2, φ10 × 2.5WBK10-01A WBK10S-01 WBK10-11 φ10 × 4, φ12 × 2, φ12 × 2.5, φ12 × 5, φ12 × 10WBK12-01A WBK12S-01 WBK12-11φ14 × 5, φ14 × 8, φ15 × 10, φ15 × 20, φ16 × 2φ16 × 2.5, φ16 × 5, φ16 × 16, φ16 × 32WBK15-01A WBK15S-01 WBK15-11 φ20 × 4, φ20 × 5, φ20 × 10, φ20 × 20, φ20 × 40WBK20-01 WBK20S-01 WBK20-11φ20 × 4, φ20 × 5, φ20 × 6, φ20 × 10, φ20 × 20φ25 × 25, φ25 × 50, φ28 × 5, φ28 × 6WBK25-01 WBK25S-01 WBK25-11φ32 × 5, φ32 × 6, φ32 × 8, φ32 × 10φ32 × 25, φ32 × 32,Remarks 1. Reference number is based on the bearing bore on the fixed support side.2. Please note that the reference numbers 12 or below on the simple-support side do not match the bore ofthe deep-groove ball bearing in use.Support units for heavy load and applicable "shaft diameter/lead combinations"Support unit / reference numberHeavy load / machine toolsFixed support side(drive motor side)Fixed support side(opposite to drive motor)WBK30DF-31 WBK25DF-31 φ36 × 10WBK30DFD-31 WBK25DFD-31 φ36 × 10, φ40 × 10"Shaft diameter/lead combinations"of standard ball screwsthat are applicable to the support unitWBK30DF-31 WBK30DF-31 φ40 × 5, φ40 × 8, φ40 × 10, φ40 × 12WBK30DFD-31 WBK30DFD-31 φ40 × 12WBK35DF-31 WBK35DF-31 φ45 × 10WBK40DF-31 WBK40DF-31 φ50 × 10WBK40DFD-31 WBK40DFD-31 φ50 × 10204

WBK Support Units 205

Square type Reference number: WBK06-01A1 23 4 5 6(22)9.5φ6φ3.5101020Section X-XRound type Reference number: WBK06-111 23 4 5 63.59.5(22)X4-2.9 drill thru.,C'bore 5.5 X 3.5PCD 28 (For M2.5 bolt)45 °-0.007-0.02022g6φ9.5φ6φφX3514 1413712 SpannerAssembly example 120(5.5)28Section X-X206

WBK Support UnitsWBK06(12)3018Unit: mmStandardstock2-5.5 drill thru.,C'bore 9.5 X 11X130-0.05255712X12 SpannerA424.5(22)2.5Parts listNumber Name of part Quantity Remarks(1.5)7 13 (6.5) Assembly example 2123456Bearing housing 1 With oil sealBearingRetaining cover 1Spacer 1One set 706ATYDFC7P5Lock nut 1 For M6, tightening torque 245N •cm {25kgf •cm}Set screw 1 M3, with a set piece (pad)Remarks 1. When installing a square support unit, place A side to thebase. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 6 after adjustment.207

Square type Reference number: WBK08-01A (fixed support side); WBK08S-01(simple support side)(13.5)3825Y9 8 72-6.6 drill thru.,C'bore 11 X 122617326φ0-0.05YSimple support sideB""5215WBK08S-01Section Y-YRound type Reference number: WBK08-118 71 23 4 5 64 (26)10Z4-3.4 drill thru.,C'bore 6.5 X 4PCD 35 (For M3 bolt)45 °17.56φ-0.007-0.02028g6φ11.5φ8φφZ4317.514914 SpannerAssembly example 123(7) 35Section Z-Z208

WBK Support UnitsWBK08Unit: mmStandardstock1 23 4 5 6(13.5)3825(26)2-6.6 drill thru.,C'bore 11 X 12X411.5811.5 11.5X239156φφFixed support side14 Spanner0-0.051732A52Section X-XWBK08-01AParts list5(26)Number Name of part Quantity Remarks41Bearing housing 1 With oil seal on fixed support side2BearingOne set 706ATYDFC7P53Retaining cover 14Spacer 15Lock nut 1 For M8, tightening torque 490N •cm {50 kgf •cm}6Set screw 1 M3, with a set piece (pad)7Bearing 1 606ZZ9141.58Assembly example 289Retaining ring 1Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 6 after adjustment.209

Square type Reference number: WBK10-01A (fixed support side); WBK10S-01 (simple support side)521098(17)36Y2-9 drill thru.,C'bore 14 X 1135438φ0-0.0525Simple support sideYB""7020WBK10S-01Section Y-YRound type Reference number: WBK10-119 81 25 6 75 (29.5)124-4.5 drill thru.,C'bore 8 X 4PCD 42 (For M4 bolt)45 °Z8φ-0.009-0.02534g6φ14φ10φ20 °Zφ52212143 4171017 SpannerAssembly example 127(7.5)42Section Z-Z210

WBK Support UnitsWBK1012525 6 752Unit: mmStandardstock(17) (29.5)36(17)36X 11X2-9 drill thru.,C'bore 14 X 11X0-0.0543254314101010181888φφFixed support side0-0.05256124X17 Spanner34AX17 SpannerA246(5.5) 7070Section X-XWBK10-01A6 (29.5)40.5Assembly example 210 17 (8.5)Assembly example 212345678910Parts listNumber Name of part Quantity RemarksBearing housing 1 With oil seal on fixed support sideBearingRetaining cover 1One set 7000ATYDFC8P5Hexagon socket head capscrew or cross recessedpan head screw4 M4Spacer 1Lock nut 1 For M10, tightening torque 930N •cm {95 kgf •cm}Set screw 1 M4 with a set piece (pad)Bearing 1 608ZZRetaining ring 1Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 7 after adjustment.211

Square typeReference umber: WBK12-01 (fixed support side); WBK12S-01 (simple support side)521098(17)36Y2-9 drill thru.,C'bore 14 X 114310φ350-0.0525Simple support sideBY70"20"WBK12S-01Section Y-YRound type Reference number: WBK12-119 81 25 6 75 (29.5)124-4.5 drill thru.,C'bore 8 X 4PCD 44 (For M4 bolt)45 °Z2210φ-0.009-0.02536g6φ15φ12φ20 °Zφ5422171043419 SpannerAssembly example 127(7.5)44Section Z-Z212

WBK Support UnitsWBK12Unit: mmStandardstock12525 6 752(29.5) 36(17)362-9 drill thru.,C'bore 14 X 11X43151281018φφ43Fixed support side0-0.052564123A4X19 SpannerA246(5.5)70Section X-XWBK12-01AParts listNumber Name of part Quantity Remarks6(29.5)1Bearing housing 1 With oil seal on fixed support side42BearingOne set 7001ATYDFC8P534Retaining cover 1Hexagon socket head capscrew or cross recessed 4 M4pan head screw5Spacer 16Lock nut 1 For M12, tightening torque 1370N •cm {140 kgf •cm}7Set screw 1 M4 with a set piece (pad)10170.5(8.5)Assembly example 28910Bearing 1 6000ZZRetaining ring 1Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 7 after adjustment.213

Square type Reference number: WBK15-01A (fixed support side); WBK15S-01(simple support side)60109819.5 41Y2-9 drill thru.,C'bore 14 X 1130504015φ0-0.05Simple support sideBY80""20WBK15S-01Section Y-YRound type Reference number: WBK15-119 81 25 6 76 (38)114-5.5 drill thru.,C'bore 9.5 X 6PCD 50 (For M5 bolt)45 °Z2615φ-0.009-0.02540g6φ19.5φ15φ20 °Zφ6326176153422 SpannerAssembly example 132(12)52Section Z-ZWBK15-11214

WBK Support UnitsWBK15Unit: mmStandardstock1 25 6 7(38)2-11 drill thru.,C'bore 17 X 15(19.5)X60415019.515102010φφFixed support side0-0.05305 312.5(12)4 X22 Spanner80ASection X-XWBK15-01AParts listNumber Name of part Quantity Remarks8(38)1Bearing housing 1 With oil seal on fixed support side72BearingOne set 7002ATYDFC8P53Retaining cover 14Hexagon socked headcap screw4 M415174(14)Assembly example 25678910Spacer 1Lock nut 1 For M15, tightening torque 2350N •cm {240 kgf •cm}Set screw 1 M4 with a set piece (pad)Bearing 1 6002ZZRetaining ring 1Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 7 after adjustment.215

Square typeReference number: WBK20-01 (fixed support side); WBK20S-01 (simple support side)751098(19.5)56Y2-11 drill thru.,C'bore 17 X 1545305820φ0-0.05YSimple support sideB95""26Section Y-YWBK20S-01Round type Reference number: WBK20-119 81 25 6 710 (52)204-6.6 drill thru.,C'bore 11 X 10PCD 70 (For M6 bolt)45 °Z20φ-0.010-0.02957g6φ2520φφ22.5 °Zφ8534341034302230 SpannerAssembly example 152(10)68Section Z-ZWBK20-11216

WBK Support UnitsWBK20(17)Unit: mmStandardstock1 25 6 710(52)10 227575X 1525φX20φ56(19.5)4-11 drill thru.,C'bore 17 X 15X56(19.5)Fixed support side13151315281030-0.05305842 104 X4 X30 SpannerSection X-XWBK20-0130 Spanner95AParts listNumber Name of part Quantity Remarks148(52)123Bearing housing 1 With oil seal on fixed support sideBearingOne set 7204ATYDFC8P5Retaining cover 14Hexagon socked headcap screw4 M65Spacer 16Lock nut 1 For M20, tightening torque 4700N •cm {480 kgf •cm}7Set screw 1 M4 with a set piece (pad)8Bearing 1 6204ZZ22 301(14)Assembly example 29 Retaining ring 110 Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 7 after adjustment.217

Square typeReference number: WBK25-01 (fixed support side); WBK25S-01 (simple support side)1098(17)8519.5 66Y2-11 drill thru.25356825φ0-0.05YSimple support sideB105""30Section Y-YWBK25S-01Round type Reference number: WBK25-119 81 25 6 710 (60)204-9 drill thru.,C'bore 15 X 13PCD 80 (For M8 bolt)45 °Z25φ-0.010-0.02963g622.5 °Z39.5φ32φ25φφ9839.53013273436 SpannerAssembly example 157(13)79Section Z-Z218

WBK Support UnitsWBK251 25 6 7(60)4830 9"4-11 drill thru.Unit: mmStandardstock"92-7.8 drill thru.(Pilot hole for 8 dia. tapered pin.)32φ25φX856619.5)Fixed support side331448133250-0.053568Section X-XWBK25-014X36 Spanner105AParts list1710(60)Number Name of part Quantity Remarks1 Bearing housing 1 With oil seal on fixed support side2 BearingOne set 7204ATYDFC8P53 Retaining cover 14Hexagon socked headcap screw4 M65Spacer 16Lock nut 1 For M25, tightening torque 8400N •cm {860 kgf •cm}7Set screw 1 M6 with a set piece (pad)27 304(20)Assembly example 289Bearing 1 6205ZZRetaining ring 110Bearing housing 1 Simple support side (only square type)Remarks 1. When installing a square support unit, place A and B sidesto the base. Use a spacer if necessary to adjust height.2. Components 1, 2, 3 are assembled into a unit. Do notdisassemble.3. An appropriate volume of grease is packed in the supportunit.4. Tighten the set screw 7 after adjustment.219

Square typeReference number: WBK12SF-01 (Simple support side: For VFA1210)Housing52362-9 drill thru.,C'bore 14 X 11(For M8 bolt)Ball bearing(6001ZZ)43120-0.05025""35φ70 20""2-C type internalretaining ring(For 28 bore)Square type Reference number: WBK15SF-01 (Simple support side: For VFA1510)Housing52362-9 drill thru.,C'bore 14 X 11(For M8 bolt)Ball bearing(6902ZZ)15430-0.05025""35φ70 20""2-C type internaretaining ring(For 28 bore220

WBK Support Unitsrill thru.,e 14 X 11M8 bolt)Ball bearing(6001ZZ)Unit: mmWBK12SFStandardstock12φ""202-C type internalretaining ring(For 28 bore)Number Name of part Quantity Remarks123Bearing housing 1 Simple support sideBearing 1 6001ZZRetaining ring 2Remarks 1. When installing the square support unit, place side A tothe base and install the unit in the vertical direction. Use aspacer if necessary to adjust height.2. Do not disassemble the support unit.3. An appropriate volume of grease is packed in the bearing.Applicable ball screw : VFA1210Parts list (WBK12SF-01)drill thru.,re 14 X 11r M8 bolt)Ball bearing(6902ZZ)15φ""202-C type internalretaining ring(For 28 bore)Number Name of part Quantity Remarks123Bearing housing 1 Simple support sideBearing 1 6902ZZRetaining ring 2Parts list (WBK15SF-01)Remarks 1. When installing the square support unit, place side A tothe base and install the unit in the vertical direction. Use aspacer if necessary to adjust height.2. Do not disassemble the support unit.3. An appropriate volume of grease is packed in the bearing.Applicable ball screw : VFA1510, VFA1520221

Round type Reference number: WBK04R-11212.5 5Mounting surface4514G5X612.5φφ4φ130-0.1φ2519φ1039Section X-X2-3.4 drill thru.(For M3 bolt)XRound type Reference number: WBK06R-11212.5 6.8Mounting surface4519G5X10φ17φ6φ180-0.1φ302412φ311Section X-X2-3.4 drill thru.(For M3 bolt)X222

WBK Support UnitsWBK∗∗R514Unit: mmParts list (WBK04R-11)Number Name of part Quantity RemarksStandardstock1Bearing housing 1X2Bearing One set F694ZZ3Spacer 12519φ104Lock nut 1 For M4, tightening torque 98N •cm {10 kgf •cm}5Set screw to secure the lock nut 1 M2.5 with a set piece (pad)2-3.4 drill thru.(For M3 bolt)XRemarks 1. Adjust phases of the bearing and the lock nut at time ofassembly, and secure them in the state when the run outof the flange mounting surface is minimal.2. Assembled to an arbor (M4 bolt, nut) at time of delivery.Remove it from the arbor and move to the ball screw shaftend before use.3. An appropriate volume of grease is packed into thebearing.4. Slightly tighten the set screw 5 after adjustment.Applicable ball screw : RMA060119Parts list (WBK06R-11)Number Name of part Quantity RemarksX1Bearing housing 12Bearing One set F696ZZ3024φ1234Spacer 1Lock nut 1 For M6, tightening torque 118N •cm {12 kgf •cm}5Set screw to secure the lock nut 1 M2.5 with a set piece (pad)2-3.4 drill thru.(For M3 bolt)XRemarks 1. Adjust phases of the bearing and the lock nut at time ofassembly, and secure them in the state when the run outof the flange mounting surface is minimal.2. Assembled to an arbor (M6 bolt, nut) at time of delivery.Remove it from the arbor and move to the ball screw shaftend before use.3. An appropriate volume of grease is packed into thebearing.4. Slightly tighten the set screw 5 after adjustment.Applicable ball screw : RMA0801, RMA0801.5, RMA0802223

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WBK Support Units(2) Dimensions of support unit: heavy-load / for machine toolsSupport units for heavy-load / machine tools use a thrust angular contact ballbearing (TAC Series) with high rigidity and accuracy. The thrust angular contact ballbearing has very suitable functions and structure as a ball screw support bearing.There are three combinations as shown below.DF combination DFD combination DFF combinationParts list1372 6 4 5 8Part number Part name Quantity1 Housing 12 Retaining cover 13High accuracy thrust angular contact ball bearingOne set4Dust seal 25678Collar 2Preload bolt 6 or 8ShimOne setLock nut 1BARemarks1. Mount sections A and B to the machine base.2. NSK support units are precisely preloaded andadjusted. Components 1, 2, 3, 4, 6, 7 areassembled into a unit. Do not disassemble.3. Grease is packed into support units.4. Lock nut 8 is exclusively prepared for ball screw.The end face of the nut is in strict control beingprecisely perpendicular to the V thread. Securethe lock nut using the set screw.Lock nut is also available as an accessory (Seepage 180. Refer to general catalogue E3161"Precision Machine Components" for high precisiontrust angular contact ball bearing (TAC Series).225

L L 34-P ∗ tap, Q(both siDg6φd1 ∗ H7φdφd1 ∗ H7φD2φD1φD3φMdφMl ∗l ∗L 3 L 4L 5L 1 L 2L6-X driC'boreLock nutDimensions of bearing seatSupport unitBasic dynamicSupport unitNo.load rating C ad D D 1 D 2 L L 1 L 2 A W X Y Z d 1 * l* V* P* Q* N {kgf}WBK 17DF-31 17 70 106 72 60 32 15 80 88 9 14 8.5 45 3 58 M5 10 21900 2240WBK 20DF-31 20 70 106 72 60 32 15 80 88 9 14 8.5 45 3 58 M5 10 21900 2240WBK 25DF-31 66 33 28500 291025 85 130 90 18 100 110 11 17.5 11 57 4 70 M6 12WBK 25DFD-31 81 48 46500 4700WBK 30DF-3166 33 29200 298030 85 130 9018 100 110 11 17.5 11 57 4 70 M6 12WBK 30DFD-31 81 48 47500 4850WBK 35DF-31 66 33 31000 3150WBK 35DFD-31 35 95 142 102 81 48 18 106 121 11 17.5 11 69 4 80 M6 12 50500 5150WBK 35DFF-31 96 48 50500 5150WBK 40DF-31 66 33 31500 3250WBK 40DFD-31 40 95 142 102 81 48 18 106 121 11 17.5 11 69 4 80 M6 12 51500 5250WBK 40DFF-31 96 48 51500 5250Remarks 1. RigidityValues in the Table are theoretical values obtained from the elastic deformation between the groove and the balls.2. Starting torqueStarting torque indicates torque due to the preload of the bearing. It does not include seal torque.3. The tolerance of the shaft bearing seatWe recommend "h5 grade of the fits tolerance.226

WBK Support Units45 °45 °30 °15 °15 °30 °Standardstock4-P ∗ tap, Q ∗ deep.(both sides)4-P ∗ tap, Q ∗ deep.(both sides)V ∗WV ∗W6-X drill thru.,C'bore Y X Z"A"8-X drill thru.,C'bore Y X Z"A"Bearing bore d 30=>Bearing bore d => 35Unit: mmPermissibleaxial loadPreloadAxial rigidityStarting torqueLock nutBearing seatfor unitN {kgf} N {kgf} N/μm {kgf/μm} N •m {kgf •m} M D 3 L 3 d L 4 L 526600 2710 2150 220 750 75 14.0 1.5 M17×1.0 37 18 17 81 2326600 2710 2150 220 750 75 14.0 1.5 M20×1.0 40 18 20 81 2340500 4150 3150 320 1000 100 23.0 289M25×1.5 45 20 2581500 8300 4300 440 1470 150 31.0 3 1042643000 4400 3350 340 1030 105 24.0 2.589M30×1.5 50 20 3086000 8800 4500 460 1520 155 33.0 3 1042650000 5100 3800 390 1180 120 28.0 3 92100000 10200 5200 530 1710 175 37.0 4 M35×1.5 55 22 35 107 30100000 10200 7650 780 2350 240 55.0 5.5 12252000 5300 3900 400 1230 125 28.0 3 92104000 10600 5300 540 1810 185 38.0 4 M40×1.5 60 22 40 107 30104000 10600 7850 800 2400 245 57.0 5.5 122Remarks 4. Dimensions with * (asterisk) mark*Pilot diameter and tapped screws marked with "asterisk *" are used for seal unit installation for NSK standard hollowshaft ball screws. They also can be used for dust cover and damper installation.5. Grease is packed into the bearing. It is not necessary to apply grease before use. We recommend "h5 grade of the fitstolerance.227

φIn addition to the support units, NSK has other components for the ball screw as shown below.Lock nutsBall screw support bearing must be installed with minimum inclination. NSK lock nuts exclusive forball screw help to reduce this inclination.X1-SSet screwB 1FGdφDφXBBrass padFSection X-XA Type Shapes and dimensionsA Type lock nutsUnit: mmLock nut reference number M D F B d B 1 S Tightening torque N • m (for reference)WBK06L-01 M6 × 0.75 14.5 12 5 10 2.7 M3, with brass made set piece 245WBK08L-01 M8 × 1.0 17 14 6.5 13 4 M3, with brass made set piece 490WBK10L-01 M10 × 1.0 20 17 8 16 5 M4, with brass made set piece 930WBK12L-01 M12 × 1.0 22 19 8 17 5 M4, with brass made set piece 1350WBK15L-01 M15 × 1.0 25 22 10 21 6 M4, with brass made set piece 2350WBK20L-01 M20 × 1.0 35 30 13 26 8 M4, with brass made set piece 4700WBK25L-01 M25 × 1.0 42 36 16 34 10 M6, with brass made set piece 8400Remarks: Insert a set piece (brass pad) and tighten the securing set screw.X2-SSet screwB 1d3φGφDd2φd1φ0-0.1Xφ4- d 44- d 5φBB 1Brass padSection X-XS Type Shapes and dimensionsS Type lock nutsLock nut reference number G D 0-0.1 B d 1 d 2 d 3 d 4 d 5 B 1 S Tightening torque N • m (for reference)WBK17L-31 M17 × 1.0 37 18 30 18 27 4.3 4 10 M6 5400WBK20L-31 M20 × 1.0 40 18 30 21 30 4.3 4 10 M6 7350WBK25L-31 M25 × 1.5 45 20 40 26 35 4.3 4 11 M6 13200WBK30L-31 M30 × 1.5 50 20 40 31 40 4.3 5 11 M6 19600WBK35L-31 M35 × 1.5 55 22 50 36 45 4.3 5 12 M6 29400WBK40L-31 M40 × 1.5 60 22 50 41 50 4.3 5 12 M6 39200Unit: mm228