![[THK] — Ball Spline Shaft SS](https://prosourcemro.com/wp-content/uploads/2026/05/001-1040-1024x768.png)
Ball Splines
THK
[THK] — Ball Spline Shaft SS
Family ID: THK-SS-SPLINE
THK SS type Ball Spline Shaft. Pitch diameter D0 = 12~50mm. Standard lengths 1500~3200mm; custom lengths available on order. Dynamic allowable torque T = 17.6~910 N·m. Number of ball grooves Z = 16 (SS12~SS25) or 20 (SS30~SS50).
10 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| SS12 | THK Ball Spline Shaft SS12, D0=12mm, T=17.6N·m, max 1500mm | THK | Pitch Diameter (D0): 12 mm | Major Diameter (Dk): 12.8 mm | Minor Diameter (Dr): 10.9 mm | Number of Ball Grooves (Z): 16 | Standard Length: 1500 mm | Max Length: 1500 mm | Dynamic Allowable Torque (T): 17.6 N·m | Nut Mass: 80 g | Shaft Mass: 0.9 kg/m | Custom Length: available on order | ||
| SS15 | THK Ball Spline Shaft SS15, D0=15mm, T=30.4N·m, max 2000mm | THK | Pitch Diameter (D0): 15 mm | Major Diameter (Dk): 16.1 mm | Minor Diameter (Dr): 13.5 mm | Number of Ball Grooves (Z): 16 | Standard Length: 1500 mm | Max Length: 2000 mm | Dynamic Allowable Torque (T): 30.4 N·m | Nut Mass: 70 g | Shaft Mass: 1.4 kg/m | Custom Length: available on order | ||
| SS17 | THK Ball Spline Shaft SS17, D0=17mm, T=43.1N·m, max 2000mm | THK | Pitch Diameter (D0): 17 mm | Major Diameter (Dk): 18.2 mm | Minor Diameter (Dr): 15.4 mm | Number of Ball Grooves (Z): 16 | Standard Length: 1500 mm | Max Length: 2000 mm | Dynamic Allowable Torque (T): 43.1 N·m | Nut Mass: 120 g | Shaft Mass: 1.7 kg/m | Custom Length: available on order | ||
| SS20 | THK Ball Spline Shaft SS20, D0=20mm, T=70.6N·m, max 3200mm | THK | Pitch Diameter (D0): 20 mm | Major Diameter (Dk): 21.5 mm | Minor Diameter (Dr): 18.3 mm | Number of Ball Grooves (Z): 16 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 70.6 N·m | Nut Mass: 160 g | Shaft Mass: 2.5 kg/m | Custom Length: available on order | ||
| SS25 | THK Ball Spline Shaft SS25, D0=25mm, T=152.0N·m, max 3200mm | THK | Pitch Diameter (D0): 25 mm | Major Diameter (Dk): 26.9 mm | Minor Diameter (Dr): 22.6 mm | Number of Ball Grooves (Z): 16 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 152.0 N·m | Nut Mass: 220 g | Shaft Mass: 3.8 kg/m | Custom Length: available on order | ||
| SS30 | THK Ball Spline Shaft SS30, D0=30mm, T=212.0N·m, max 3200mm | THK | Pitch Diameter (D0): 30 mm | Major Diameter (Dk): 31.8 mm | Minor Diameter (Dr): 28.2 mm | Number of Ball Grooves (Z): 20 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 212.0 N·m | Nut Mass: 400 g | Shaft Mass: 5.5 kg/m | Custom Length: available on order | ||
| SS35 | THK Ball Spline Shaft SS35, D0=35mm, T=325.0N·m, max 3200mm | THK | Pitch Diameter (D0): 35 mm | Major Diameter (Dk): 37.1 mm | Minor Diameter (Dr): 32.8 mm | Number of Ball Grooves (Z): 20 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 325.0 N·m | Nut Mass: 560 g | Shaft Mass: 7.5 kg/m | Custom Length: available on order | ||
| SS40 | THK Ball Spline Shaft SS40, D0=40mm, T=480.0N·m, max 3200mm | THK | Pitch Diameter (D0): 40 mm | Major Diameter (Dk): 42.4 mm | Minor Diameter (Dr): 37.5 mm | Number of Ball Grooves (Z): 20 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 480.0 N·m | Nut Mass: 830 g | Shaft Mass: 9.8 kg/m | Custom Length: available on order | ||
| SS45 | THK Ball Spline Shaft SS45, D0=45mm, T=680.0N·m, max 3200mm | THK | Pitch Diameter (D0): 45 mm | Major Diameter (Dk): 47.7 mm | Minor Diameter (Dr): 42.1 mm | Number of Ball Grooves (Z): 20 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 680.0 N·m | Nut Mass: 980 g | Shaft Mass: 12.4 kg/m | Custom Length: available on order | ||
| SS50 | THK Ball Spline Shaft SS50, D0=50mm, T=910.0N·m, max 3200mm | THK | Pitch Diameter (D0): 50 mm | Major Diameter (Dk): 53.0 mm | Minor Diameter (Dr): 46.8 mm | Number of Ball Grooves (Z): 20 | Standard Length: 1500 mm | Max Length: 3200 mm | Dynamic Allowable Torque (T): 910.0 N·m | Nut Mass: 1080 g | Shaft Mass: 15.4 kg/m | Custom Length: available on order |
