![[THK] — Ball Spline Nut DP (Key Groove Type)](https://prosourcemro.com/wp-content/uploads/2026/05/001-1041-1024x768.png)
Ball Splines
THK
[THK] — Ball Spline Nut DP (Key Groove Type)
Family ID: THK-DP
THK DP type Ball Spline Nut, key groove mounting design. Outer diameter D = 22~68mm, nut length 22~67mm. Key groove dimensions b×t provided for positive torque transmission. Dynamic allowable torque contact pressure 9.8 N/mm². Rotational clearance ≤20' MAX. Compatible with SS series spline shafts (SS12~SS50). Do not install multiple spline nuts in one housing.
10 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| DP12 | THK Ball Spline Nut DP12 (key groove), D=22mm, L=22mm, T=19.6N·m | THK | Outer Diameter (D): 22 mm (0/-0.052) | Nut Length (L): 22 mm | Key Width (b): 4 mm | Key Depth (t): 2.0 mm | Key Length (ℓ): 16 mm | Mounting Type: Key groove | Compatible Shaft: SS12 | Dynamic Allowable Torque (T): 19.6 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP15 | THK Ball Spline Nut DP15 (key groove), D=22mm, L=22mm, T=33.3N·m | THK | Outer Diameter (D): 22 mm (0/-0.052) | Nut Length (L): 22 mm | Key Width (b): 4 mm | Key Depth (t): 2.0 mm | Key Length (ℓ): 16 mm | Mounting Type: Key groove | Compatible Shaft: SS15 | Dynamic Allowable Torque (T): 33.3 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP17 | THK Ball Spline Nut DP17 (key groove), D=28mm, L=26mm, T=48.0N·m | THK | Outer Diameter (D): 28 mm (0/-0.052) | Nut Length (L): 26 mm | Key Width (b): 5 mm | Key Depth (t): 2.5 mm | Key Length (ℓ): 18 mm | Mounting Type: Key groove | Compatible Shaft: SS17 | Dynamic Allowable Torque (T): 48.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP20 | THK Ball Spline Nut DP20 (key groove), D=32mm, L=31mm, T=77.5N·m | THK | Outer Diameter (D): 32 mm (0/-0.062) | Nut Length (L): 31 mm | Key Width (b): 7 mm | Key Depth (t): 2.5 mm | Key Length (ℓ): 22 mm | Mounting Type: Key groove | Compatible Shaft: SS20 | Dynamic Allowable Torque (T): 77.5 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP25 | THK Ball Spline Nut DP25 (key groove), D=36mm, L=40mm, T=169.0N·m | THK | Outer Diameter (D): 36 mm (0/-0.062) | Nut Length (L): 40 mm | Key Width (b): 7 mm | Key Depth (t): 2.5 mm | Key Length (ℓ): 26 mm | Mounting Type: Key groove | Compatible Shaft: SS25 | Dynamic Allowable Torque (T): 169.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP30 | THK Ball Spline Nut DP30 (key groove), D=44mm, L=45mm, T=238.0N·m | THK | Outer Diameter (D): 44 mm (0/-0.062) | Nut Length (L): 45 mm | Key Width (b): 10 mm | Key Depth (t): 4.0 mm | Key Length (ℓ): 32 mm | Mounting Type: Key groove | Compatible Shaft: SS30 | Dynamic Allowable Torque (T): 238.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP35 | THK Ball Spline Nut DP35 (key groove), D=52mm, L=49mm, T=362.0N·m | THK | Outer Diameter (D): 52 mm (0/-0.074) | Nut Length (L): 49 mm | Key Width (b): 12 mm | Key Depth (t): 4.5 mm | Key Length (ℓ): 40 mm | Mounting Type: Key groove | Compatible Shaft: SS35 | Dynamic Allowable Torque (T): 362.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP40 | THK Ball Spline Nut DP40 (key groove), D=58mm, L=57mm, T=547.0N·m | THK | Outer Diameter (D): 58 mm (0/-0.074) | Nut Length (L): 57 mm | Key Width (b): 15 mm | Key Depth (t): 5.0 mm | Key Length (ℓ): 42 mm | Mounting Type: Key groove | Compatible Shaft: SS40 | Dynamic Allowable Torque (T): 547.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP45 | THK Ball Spline Nut DP45 (key groove), D=64mm, L=62mm, T=767.0N·m | THK | Outer Diameter (D): 64 mm (0/-0.074) | Nut Length (L): 62 mm | Key Width (b): 15 mm | Key Depth (t): 5.0 mm | Key Length (ℓ): 48 mm | Mounting Type: Key groove | Compatible Shaft: SS45 | Dynamic Allowable Torque (T): 767.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing | ||
| DP50 | THK Ball Spline Nut DP50 (key groove), D=68mm, L=67mm, T=1020.0N·m | THK | Outer Diameter (D): 68 mm (0/-0.074) | Nut Length (L): 67 mm | Key Width (b): 15 mm | Key Depth (t): 5.0 mm | Key Length (ℓ): 52 mm | Mounting Type: Key groove | Compatible Shaft: SS50 | Dynamic Allowable Torque (T): 1020.0 N·m | Rotational Clearance: ≤20' MAX | Note: Do not install multiple nuts in one housing |
