• WON ST Compact Ball Spline WSP Series, Cylinder Type with Key Groove
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WON ST Compact Ball Spline WSP Series, Cylinder Type with Key Groove

WON ST Compact Ball Spline WSP Series, Cylinder Type with Key Groove

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; cylindrical nut with key groove.

Key features

  • Cylindrical nut with key groove for accurate rotational positioning
  • 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 Cylinder nut with key groove
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)
WSP4 Shaft diameter d: 4 mm | Nut outer diameter D: 8 mm | Nut length L1: 12 mm | C (dynamic): 304 N | C0 (static): 382 N | T (dynamic torque): 0.686 N·m | T0 (static torque): 0.882 N·m | Nut mass: 2.5 g | Shaft mass: 9.6 g/100mm | Max. shaft length: 200 mm
WSP5 Shaft diameter d: 5 mm | Nut outer diameter D: 10 mm | Nut length L1: 17.5 mm | Key groove width W: 2 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: 4.8 g | Shaft mass: 14.9 g/100mm | Max. shaft length: 200 mm
WSP6 Shaft diameter d: 6 mm | Nut outer diameter D: 12 mm | Nut length L1: 20.6 mm | Key groove width W: 2 mm | C (dynamic): 715 N | C0 (static): 853 N | T (dynamic torque): 2.45 N·m | T0 (static torque): 3.038 N·m | Nut mass: 8.9 g | Shaft mass: 19 g/100mm | Max. shaft length: 300 mm
WSP8 Shaft diameter d: 8 mm | Nut outer diameter D: 15 mm | Nut length L1: 24.4 mm | Key groove width W: 2.5 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: 15.9 g | Shaft mass: 39 g/100mm | Max. shaft length: 500 mm
WSP10 Shaft diameter d: 10 mm | Nut outer diameter D: 19 mm | Nut length L1: 29.6 mm | Key groove width W: 3 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: 31.5 g | Shaft mass: 60.5 g/100mm | Max. shaft length: 600 mm
WSP12 Shaft diameter d: 12 mm | Nut outer diameter D: 21 mm | Nut length L1: 34.7 mm | Key groove width W: 3 mm | C (dynamic): 2156 N | C0 (static): 2646 N | T (dynamic torque): 14.7 N·m | T0 (static torque): 18.62 N·m | Nut mass: 44 g | Shaft mass: 87.5 g/100mm | Max. shaft length: 800 mm
WSP15 Shaft diameter d: 13.6 mm | Nut outer diameter D: 23 mm | Nut length L1: 40 mm | Key groove width W: 3.5 mm | C (dynamic): 4241 N | C0 (static): 6076 N | T (dynamic torque): 31.36 N·m | T0 (static torque): 45.08 N·m | Nut mass: 59.5 g | Shaft mass: 111 g/100mm | Max. shaft length: 1000 mm
WSP20 Shaft diameter d: 18.2 mm | Nut outer diameter D: 30 mm | Nut length L1: 50 mm | Key groove width W: 4 mm | C (dynamic): 6566 N | C0 (static): 9016 N | T (dynamic torque): 65.66 N·m | T0 (static torque): 90.6 N·m | Nut mass: 130 g | Shaft mass: 202 g/100mm | Max. shaft length: 1000 mm
WSP25 Shaft diameter d: 22.6 mm | Nut outer diameter D: 37 mm | Nut length L1: 60 mm | Key groove width W: 5 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: 220 g | Shaft mass: 310 g/100mm | Max. shaft length: 1200 mm
WSP30 Shaft diameter d: 27.2 mm | Nut outer diameter D: 45 mm | Nut length L1: 70 mm | Key groove width W: 7 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: 430 g | Shaft mass: 450 g/100mm | Max. shaft length: 1200 mm
WSP40 Shaft diameter d: 37.2 mm | Nut outer diameter D: 60 mm | Nut length L1: 100 mm | Key groove width W: 10 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: 760 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 WSP Series, Cylinder Type with Key Groove

Brand WON ST·Ball Splines

Available part numbers (11)

WSP4, WSP5, WSP6, WSP8, WSP10, WSP12, WSP15, WSP20, WSP25, WSP30 + 1 more — see full table ↓

How to order

Send the WON ST part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

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Product codeSpec
WSP4Shaft diameter d: 4 mm | Nut outer diameter D: 8 mm | Nut length L1: 12 mm | C (dynamic): 304 N | C0 (static): 382 N | T (dynamic torque): 0.686 N·m | T0 (static torque): 0.882 N·m | Nut mass: 2.5 g | Shaft mass: 9.6 g/100mm | Max. shaft length: 200 mm
WSP5Shaft diameter d: 5 mm | Nut outer diameter D: 10 mm | Nut length L1: 17.5 mm | Key groove width W: 2 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: 4.8 g | Shaft mass: 14.9 g/100mm | Max. shaft length: 200 mm
WSP6Shaft diameter d: 6 mm | Nut outer diameter D: 12 mm | Nut length L1: 20.6 mm | Key groove width W: 2 mm | C (dynamic): 715 N | C0 (static): 853 N | T (dynamic torque): 2.45 N·m | T0 (static torque): 3.038 N·m | Nut mass: 8.9 g | Shaft mass: 19 g/100mm | Max. shaft length: 300 mm
WSP8Shaft diameter d: 8 mm | Nut outer diameter D: 15 mm | Nut length L1: 24.4 mm | Key groove width W: 2.5 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: 15.9 g | Shaft mass: 39 g/100mm | Max. shaft length: 500 mm
WSP10Shaft diameter d: 10 mm | Nut outer diameter D: 19 mm | Nut length L1: 29.6 mm | Key groove width W: 3 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: 31.5 g | Shaft mass: 60.5 g/100mm | Max. shaft length: 600 mm
WSP12Shaft diameter d: 12 mm | Nut outer diameter D: 21 mm | Nut length L1: 34.7 mm | Key groove width W: 3 mm | C (dynamic): 2156 N | C0 (static): 2646 N | T (dynamic torque): 14.7 N·m | T0 (static torque): 18.62 N·m | Nut mass: 44 g | Shaft mass: 87.5 g/100mm | Max. shaft length: 800 mm
WSP15Shaft diameter d: 13.6 mm | Nut outer diameter D: 23 mm | Nut length L1: 40 mm | Key groove width W: 3.5 mm | C (dynamic): 4241 N | C0 (static): 6076 N | T (dynamic torque): 31.36 N·m | T0 (static torque): 45.08 N·m | Nut mass: 59.5 g | Shaft mass: 111 g/100mm | Max. shaft length: 1000 mm
WSP20Shaft diameter d: 18.2 mm | Nut outer diameter D: 30 mm | Nut length L1: 50 mm | Key groove width W: 4 mm | C (dynamic): 6566 N | C0 (static): 9016 N | T (dynamic torque): 65.66 N·m | T0 (static torque): 90.6 N·m | Nut mass: 130 g | Shaft mass: 202 g/100mm | Max. shaft length: 1000 mm
WSP25Shaft diameter d: 22.6 mm | Nut outer diameter D: 37 mm | Nut length L1: 60 mm | Key groove width W: 5 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: 220 g | Shaft mass: 310 g/100mm | Max. shaft length: 1200 mm
WSP30Shaft diameter d: 27.2 mm | Nut outer diameter D: 45 mm | Nut length L1: 70 mm | Key groove width W: 7 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: 430 g | Shaft mass: 450 g/100mm | Max. shaft length: 1200 mm
WSP40Shaft diameter d: 37.2 mm | Nut outer diameter D: 60 mm | Nut length L1: 100 mm | Key groove width W: 10 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: 760 g | Shaft mass: 808 g/100mm | Max. shaft length: 1200 mm

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