• WON ST Compact Ball Spline WSPK Series, Square Flange Type
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WON ST Compact Ball Spline WSPK Series, Square Flange Type

WON ST Compact Ball Spline WSPK Series, Square Flange Type

Compact ball spline with a precision-ground Gothic-arch spline shaft and ball nut that carries radial and moment loads and transmits rotational torque with one nut; square flange nut.

Key features

  • Square flange nut for easy installation
  • Two rows of Gothic-arch grooves with 4-point ball contact
  • Transmits torque while bearing radial and moment loads with one nut
  • Preload possible for zero rotational clearance and high rigidity
  • Rated load about ten times that of a ball bushing of equal shaft diameter

Specifications

Nut type Square flange nut
Shaft type options S solid / H hollow
Clearance options CL no preload / CM standard / CT light preload
Precision options Normal / H precision / P super
Material options Standard / M stainless (nut and shaft)
WSPK4 Shaft diameter d: 4 mm | Nut outer diameter D: 8 mm | Nut length L1: 12 mm | Flange diameter D1: 21 mm | Flange width B: 10 mm | Bolt PCD: 15 mm | C (dynamic): 303 N | C0 (static): 382 N | T (dynamic torque): 0.686 N·m | T0 (static torque): 0.882 N·m | Nut mass: 5.1 g | Shaft mass: 9.6 g/100mm | Max. shaft length: 200 mm
WSPK5 Shaft diameter d: 5 mm | Nut outer diameter D: 10 mm | Nut length L1: 17.5 mm | Flange diameter D1: 23 mm | Flange width B: 18 mm | Bolt PCD: 17 mm | C (dynamic): 588 N | C0 (static): 637 N | T (dynamic torque): 1.764 N·m | T0 (static torque): 1.96 N·m | Nut mass: 8.9 g | Shaft mass: 14.9 g/100mm | Max. shaft length: 200 mm
WSPK6 Shaft diameter d: 6 mm | Nut outer diameter D: 12 mm | Nut length L1: 20.6 mm | Flange diameter D1: 25 mm | Flange width B: 20 mm | Bolt PCD: 19 mm | C (dynamic): 715.4 N | C0 (static): 852.6 N | T (dynamic torque): 2.45 N·m | T0 (static torque): 3.038 N·m | Nut mass: 13.9 g | Shaft mass: 19 g/100mm | Max. shaft length: 300 mm
WSPK8 Shaft diameter d: 8 mm | Nut outer diameter D: 15 mm | Nut length L1: 24.4 mm | Flange diameter D1: 28 mm | Flange width B: 22 mm | Bolt PCD: 22 mm | C (dynamic): 1176 N | C0 (static): 1372 N | T (dynamic torque): 5.488 N·m | T0 (static torque): 6.174 N·m | Nut mass: 23.5 g | Shaft mass: 39 g/100mm | Max. shaft length: 500 mm
WSPK10 Shaft diameter d: 10 mm | Nut outer diameter D: 19 mm | Nut length L1: 29.6 mm | Flange diameter D1: 36 mm | Flange width B: 28 mm | Bolt PCD: 28 mm | C (dynamic): 1862 N | C0 (static): 2156 N | T (dynamic torque): 10.78 N·m | T0 (static torque): 12.74 N·m | Nut mass: 45 g | Shaft mass: 60.5 g/100mm | Max. shaft length: 600 mm
WSPK12 Shaft diameter d: 12 mm | Nut outer diameter D: 21 mm | Nut length L1: 34.7 mm | Flange diameter D1: 38 mm | Flange width B: 30 mm | Bolt PCD: 30 mm | C (dynamic): 2156 N | C0 (static): 2646 N | T (dynamic torque): 14.70 N·m | T0 (static torque): 18.62 N·m | Nut mass: 59 g | Shaft mass: 87.5 g/100mm | Max. shaft length: 800 mm
WSPK15 Shaft diameter d: 13.6 mm | Nut outer diameter D: 23 mm | Nut length L1: 40 mm | Flange diameter D1: 40 mm | Flange width B: 31 mm | Bolt PCD: 32 mm | C (dynamic): 4214 N | C0 (static): 6076 N | T (dynamic torque): 31.36 N·m | T0 (static torque): 45.08 N·m | Nut mass: 77 g | Shaft mass: 111 g/100mm | Max. shaft length: 1000 mm
WSPK20 Shaft diameter d: 18.2 mm | Nut outer diameter D: 30 mm | Nut length L1: 50 mm | Flange diameter D1: 46 mm | Flange width B: 35 mm | Bolt PCD: 38 mm | C (dynamic): 6566 N | C0 (static): 9016 N | T (dynamic torque): 65.66 N·m | T0 (static torque): 90.16 N·m | Nut mass: 150 g | Shaft mass: 202 g/100mm | Max. shaft length: 1000 mm
WSPK25 Shaft diameter d: 22.6 mm | Nut outer diameter D: 37 mm | Nut length L1: 60 mm | Flange diameter D1: 57 mm | Flange width B: 43 mm | Bolt PCD: 47 mm | C (dynamic): 11196 N | C0 (static): 14294 N | T (dynamic torque): 138.94 N·m | T0 (static torque): 177.93 N·m | Nut mass: 255 g | Shaft mass: 310 g/100mm | Max. shaft length: 1200 mm
WSPK30 Shaft diameter d: 27.2 mm | Nut outer diameter D: 45 mm | Nut length L1: 70 mm | Flange diameter D1: 65 mm | Flange width B: 50 mm | Bolt PCD: 54 mm | C (dynamic): 15394 N | C0 (static): 19392 N | T (dynamic torque): 230.91 N·m | T0 (static torque): 291.88 N·m | Nut mass: 476 g | Shaft mass: 450 g/100mm | Max. shaft length: 1200 mm
WSPK40 Shaft diameter d: 37.2 mm | Nut outer diameter D: 60 mm | Nut length L1: 100 mm | Flange diameter D1: 93 mm | Flange width B: 73 mm | Bolt PCD: 73 mm | C (dynamic): 21291 N | C0 (static): 31587 N | T (dynamic torque): 425.83 N·m | T0 (static torque): 631.75 N·m | Nut mass: 962 g | Shaft mass: 808 g/100mm | Max. shaft length: 1200 mm
Ball SplinesWON ST
11 product codes available in this family
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WON ST Compact Ball Spline WSPK Series, Square Flange Type

Brand WON ST·Ball Splines

Available part numbers (11)

WSPK4, WSPK5, WSPK6, WSPK8, WSPK10, WSPK12, WSPK15, WSPK20, WSPK25, WSPK30 + 1 more — see full table ↓

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Product codeSpec
WSPK4Shaft diameter d: 4 mm | Nut outer diameter D: 8 mm | Nut length L1: 12 mm | Flange diameter D1: 21 mm | Flange width B: 10 mm | Bolt PCD: 15 mm | C (dynamic): 303 N | C0 (static): 382 N | T (dynamic torque): 0.686 N·m | T0 (static torque): 0.882 N·m | Nut mass: 5.1 g | Shaft mass: 9.6 g/100mm | Max. shaft length: 200 mm
WSPK5Shaft diameter d: 5 mm | Nut outer diameter D: 10 mm | Nut length L1: 17.5 mm | Flange diameter D1: 23 mm | Flange width B: 18 mm | Bolt PCD: 17 mm | C (dynamic): 588 N | C0 (static): 637 N | T (dynamic torque): 1.764 N·m | T0 (static torque): 1.96 N·m | Nut mass: 8.9 g | Shaft mass: 14.9 g/100mm | Max. shaft length: 200 mm
WSPK6Shaft diameter d: 6 mm | Nut outer diameter D: 12 mm | Nut length L1: 20.6 mm | Flange diameter D1: 25 mm | Flange width B: 20 mm | Bolt PCD: 19 mm | C (dynamic): 715.4 N | C0 (static): 852.6 N | T (dynamic torque): 2.45 N·m | T0 (static torque): 3.038 N·m | Nut mass: 13.9 g | Shaft mass: 19 g/100mm | Max. shaft length: 300 mm
WSPK8Shaft diameter d: 8 mm | Nut outer diameter D: 15 mm | Nut length L1: 24.4 mm | Flange diameter D1: 28 mm | Flange width B: 22 mm | Bolt PCD: 22 mm | C (dynamic): 1176 N | C0 (static): 1372 N | T (dynamic torque): 5.488 N·m | T0 (static torque): 6.174 N·m | Nut mass: 23.5 g | Shaft mass: 39 g/100mm | Max. shaft length: 500 mm
WSPK10Shaft diameter d: 10 mm | Nut outer diameter D: 19 mm | Nut length L1: 29.6 mm | Flange diameter D1: 36 mm | Flange width B: 28 mm | Bolt PCD: 28 mm | C (dynamic): 1862 N | C0 (static): 2156 N | T (dynamic torque): 10.78 N·m | T0 (static torque): 12.74 N·m | Nut mass: 45 g | Shaft mass: 60.5 g/100mm | Max. shaft length: 600 mm
WSPK12Shaft diameter d: 12 mm | Nut outer diameter D: 21 mm | Nut length L1: 34.7 mm | Flange diameter D1: 38 mm | Flange width B: 30 mm | Bolt PCD: 30 mm | C (dynamic): 2156 N | C0 (static): 2646 N | T (dynamic torque): 14.70 N·m | T0 (static torque): 18.62 N·m | Nut mass: 59 g | Shaft mass: 87.5 g/100mm | Max. shaft length: 800 mm
WSPK15Shaft diameter d: 13.6 mm | Nut outer diameter D: 23 mm | Nut length L1: 40 mm | Flange diameter D1: 40 mm | Flange width B: 31 mm | Bolt PCD: 32 mm | C (dynamic): 4214 N | C0 (static): 6076 N | T (dynamic torque): 31.36 N·m | T0 (static torque): 45.08 N·m | Nut mass: 77 g | Shaft mass: 111 g/100mm | Max. shaft length: 1000 mm
WSPK20Shaft diameter d: 18.2 mm | Nut outer diameter D: 30 mm | Nut length L1: 50 mm | Flange diameter D1: 46 mm | Flange width B: 35 mm | Bolt PCD: 38 mm | C (dynamic): 6566 N | C0 (static): 9016 N | T (dynamic torque): 65.66 N·m | T0 (static torque): 90.16 N·m | Nut mass: 150 g | Shaft mass: 202 g/100mm | Max. shaft length: 1000 mm
WSPK25Shaft diameter d: 22.6 mm | Nut outer diameter D: 37 mm | Nut length L1: 60 mm | Flange diameter D1: 57 mm | Flange width B: 43 mm | Bolt PCD: 47 mm | C (dynamic): 11196 N | C0 (static): 14294 N | T (dynamic torque): 138.94 N·m | T0 (static torque): 177.93 N·m | Nut mass: 255 g | Shaft mass: 310 g/100mm | Max. shaft length: 1200 mm
WSPK30Shaft diameter d: 27.2 mm | Nut outer diameter D: 45 mm | Nut length L1: 70 mm | Flange diameter D1: 65 mm | Flange width B: 50 mm | Bolt PCD: 54 mm | C (dynamic): 15394 N | C0 (static): 19392 N | T (dynamic torque): 230.91 N·m | T0 (static torque): 291.88 N·m | Nut mass: 476 g | Shaft mass: 450 g/100mm | Max. shaft length: 1200 mm
WSPK40Shaft diameter d: 37.2 mm | Nut outer diameter D: 60 mm | Nut length L1: 100 mm | Flange diameter D1: 93 mm | Flange width B: 73 mm | Bolt PCD: 73 mm | C (dynamic): 21291 N | C0 (static): 31587 N | T (dynamic torque): 425.83 N·m | T0 (static torque): 631.75 N·m | Nut mass: 962 g | Shaft mass: 808 g/100mm | Max. shaft length: 1200 mm

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