![[THK] — Change Screw Shaft CT (Multi-start, 45° Lead Angle)](https://prosourcemro.com/wp-content/uploads/2026/05/001-1044-1024x768.png)
Ball Screws
THK
[THK] — Change Screw Shaft CT (Multi-start, 45° Lead Angle)
Family ID: THK-CT
THK CT type multi-start screw shaft with 45° lead angle. 11 sizes CT8T~CT50, outer diameter Dk = 9~52mm. Dynamic allowable torque T = 3.24~681 N·m; thrust F = 863~28500 N. CT40/45/50: order basis only. Standard lengths available; specify T (rolled) type when ordering.
11 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| CT8T | THK Change Screw Shaft CT8T, Dk=9mm, lead=24mm, T=3.24N·m | THK | Outer Diameter (Dk): 9 mm | Effective Diameter (D0): 7.6 mm | Root Diameter (Dr): 6.2 mm | Lead: 24 mm | Lead Angle: 45° | Number of Starts (Z): 6 | Standard Lengths: 500,1000 mm | Max Length: 1000 mm | Dynamic Allowable Torque (T): 3.24 N·m | Dynamic Allowable Thrust (F): 863 N | Flange Static Allowable Load (P): 1800 N | Nut Mass: 5 g | Shaft Mass: 0.36 kg/m | Availability: Standard stock | ||
| CT12T | THK Change Screw Shaft CT12T, Dk=13.3mm, lead=36mm, T=12.7N·m | THK | Outer Diameter (Dk): 13.3 mm | Effective Diameter (D0): 11.5 mm | Root Diameter (Dr): 9.7 mm | Lead: 36 mm | Lead Angle: 45° | Number of Starts (Z): 7 | Standard Lengths: 500,1000 mm | Max Length: 1500 mm | Dynamic Allowable Torque (T): 12.7 N·m | Dynamic Allowable Thrust (F): 1370 N | Flange Static Allowable Load (P): 2800 N | Nut Mass: 10 g | Shaft Mass: 0.82 kg/m | Availability: Standard stock | ||
| CT15T | THK Change Screw Shaft CT15T, Dk=15.8mm, lead=44.4mm, T=16.7N·m | THK | Outer Diameter (Dk): 15.8 mm | Effective Diameter (D0): 13.7 mm | Root Diameter (Dr): 11.6 mm | Lead: 44.4 mm | Lead Angle: 45° | Number of Starts (Z): 8 | Standard Lengths: 500,1000 mm | Max Length: 1500 mm | Dynamic Allowable Torque (T): 16.7 N·m | Dynamic Allowable Thrust (F): 2300 N | Flange Static Allowable Load (P): 13800 N | Nut Mass: 60 g | Shaft Mass: 1.2 kg/m | Availability: Standard stock | ||
| CT17T | THK Change Screw Shaft CT17T, Dk=17.8mm, lead=50mm, T=20.6N·m | THK | Outer Diameter (Dk): 17.8 mm | Effective Diameter (D0): 15.7 mm | Root Diameter (Dr): 13.6 mm | Lead: 50 mm | Lead Angle: 45° | Number of Starts (Z): 9 | Standard Lengths: 500,1000 mm | Max Length: 1500 mm | Dynamic Allowable Torque (T): 20.6 N·m | Dynamic Allowable Thrust (F): 2600 N | Flange Static Allowable Load (P): 28100 N | Nut Mass: 95 g | Shaft Mass: 1.5 kg/m | Availability: Standard stock | ||
| CT20T | THK Change Screw Shaft CT20T, Dk=21.2mm, lead=60mm, T=40.2N·m | THK | Outer Diameter (Dk): 21.2 mm | Effective Diameter (D0): 18.7 mm | Root Diameter (Dr): 16.2 mm | Lead: 60 mm | Lead Angle: 45° | Number of Starts (Z): 9 | Standard Lengths: 500,1000,1500 mm | Max Length: 3000 mm | Dynamic Allowable Torque (T): 40.2 N·m | Dynamic Allowable Thrust (F): 4170 N | Flange Static Allowable Load (P): 34600 N | Nut Mass: 135 g | Shaft Mass: 2.6 kg/m | Availability: Standard stock | ||
| CT25T | THK Change Screw Shaft CT25T, Dk=25.6mm, lead=73.3mm, T=74.5N·m | THK | Outer Diameter (Dk): 25.6 mm | Effective Diameter (D0): 23.1 mm | Root Diameter (Dr): 20.6 mm | Lead: 73.3 mm | Lead Angle: 45° | Number of Starts (Z): 11 | Standard Lengths: 500,1000,1500 mm | Max Length: 3000 mm | Dynamic Allowable Torque (T): 74.5 N·m | Dynamic Allowable Thrust (F): 6370 N | Flange Static Allowable Load (P): 38500 N | Nut Mass: 175 g | Shaft Mass: 3.3 kg/m | Availability: Standard stock | ||
| CT30T | THK Change Screw Shaft CT30T, Dk=31.9mm, lead=93.3mm, T=130.0N·m | THK | Outer Diameter (Dk): 31.9 mm | Effective Diameter (D0): 29.4 mm | Root Diameter (Dr): 26.9 mm | Lead: 93.3 mm | Lead Angle: 45° | Number of Starts (Z): 14 | Standard Lengths: 500,1000,2000 mm | Max Length: 4000 mm | Dynamic Allowable Torque (T): 130.0 N·m | Dynamic Allowable Thrust (F): 8090 N | Flange Static Allowable Load (P): 55400 N | Nut Mass: 290 g | Shaft Mass: 5.3 kg/m | Availability: Standard stock | ||
| CT35T | THK Change Screw Shaft CT35T, Dk=34.1mm, lead=97.7mm, T=144.0N·m | THK | Outer Diameter (Dk): 34.1 mm | Effective Diameter (D0): 31.1 mm | Root Diameter (Dr): 28.1 mm | Lead: 97.7 mm | Lead Angle: 45° | Number of Starts (Z): 11 | Standard Lengths: 500,1000,2000 mm | Max Length: 4000 mm | Dynamic Allowable Torque (T): 144.0 N·m | Dynamic Allowable Thrust (F): 9260 N | Flange Static Allowable Load (P): 84500 N | Nut Mass: 425 g | Shaft Mass: 5.8 kg/m | Availability: Standard stock | ||
| CT40 | THK Change Screw Shaft CT40, Dk=44mm, lead=119.9mm, T=381.0N·m | THK | Outer Diameter (Dk): 44 mm | Effective Diameter (D0): 38.18 mm | Root Diameter (Dr): 33.3 mm | Lead: 119.9 mm | Lead Angle: 45° | Number of Starts (Z): 12 | Standard Lengths: 500,1000,2000 mm | Max Length: Contact THK | Dynamic Allowable Torque (T): 381.0 N·m | Dynamic Allowable Thrust (F): 20000 N | Flange Static Allowable Load (P): 85200 N | Nut Mass: 715 g | Shaft Mass: 9.0 kg/m | Availability: Order basis only | ||
| CT45 | THK Change Screw Shaft CT45, Dk=47mm, lead=129.9mm, T=474.0N·m | THK | Outer Diameter (Dk): 47 mm | Effective Diameter (D0): 41.37 mm | Root Diameter (Dr): 36.4 mm | Lead: 129.9 mm | Lead Angle: 45° | Number of Starts (Z): 13 | Standard Lengths: 1000,2000,3000 mm | Max Length: Contact THK | Dynamic Allowable Torque (T): 474.0 N·m | Dynamic Allowable Thrust (F): 22900 N | Flange Static Allowable Load (P): 115000 N | Nut Mass: 820 g | Shaft Mass: 10.6 kg/m | Availability: Order basis only | ||
| CT50 | THK Change Screw Shaft CT50, Dk=52mm, lead=149.9mm, T=681.0N·m | THK | Outer Diameter (Dk): 52 mm | Effective Diameter (D0): 47.73 mm | Root Diameter (Dr): 42.9 mm | Lead: 149.9 mm | Lead Angle: 45° | Number of Starts (Z): 15 | Standard Lengths: 1000,2000,3000 mm | Max Length: Contact THK | Dynamic Allowable Torque (T): 681.0 N·m | Dynamic Allowable Thrust (F): 28500 N | Flange Static Allowable Load (P): 108000 N | Nut Mass: 925 g | Shaft Mass: 14.0 kg/m | Availability: Order basis only |
