![[THK] — FK Support Unit (Fixed Side, Circular Type, for Ball Screw)](https://prosourcemro.com/wp-content/uploads/2026/05/001-893-1024x791.png)
Ball Screws
THK
[THK] — FK Support Unit (Fixed Side, Circular Type, for Ball Screw)
Family ID: THK-FK
THK FK-type Ball Screw Support Unit (fixed side, circular housing). High-rigidity low-torque angular contact bearing optimized for ball screw rigidity balance. Two mounting methods available (A and B). Compact and simple mounting. Shaft diameter range φ4~30mm.
10 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| FK4 | THK FK4, Fixed Side Support Unit, φ4mm | THK | Shaft Diameter: φ4mm | Housing Length L: 15mm | H: 6mm | F: 9mm | E: 17.5mm | Housing OD D: 18mm | Inner Dia A: 32mm | PCD: 24mm | Width B: 25mm | Bearing: 704 equivalent (DF P5) | Mass: 0.05kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK5 | THK FK5, Fixed Side Support Unit, φ5mm | THK | Shaft Diameter: φ5mm | Housing Length L: 16.5mm | H: 6mm | F: 10.5mm | E: 18.5mm | Housing OD D: 20mm | Inner Dia A: 34mm | PCD: 26mm | Width B: 26mm | Bearing: 705 equivalent (DF P5) | Mass: 0.06kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK6 | THK FK6, Fixed Side Support Unit, φ6mm | THK | Shaft Diameter: φ6mm | Housing Length L: 20mm | H: 7mm | F: 13mm | E: 22mm | Housing OD D: 22mm | Inner Dia A: 36mm | PCD: 28mm | Width B: 28mm | Bearing: 706 equivalent (DF P5) | Mass: 0.08kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK8 | THK FK8, Fixed Side Support Unit, φ8mm | THK | Shaft Diameter: φ8mm | Housing Length L: 23mm | H: 9mm | F: 14mm | E: 26mm | Housing OD D: 28mm | Inner Dia A: 43mm | PCD: 35mm | Width B: 35mm | Bearing: 798 equivalent (DF P5) | Mass: 0.15kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK10 | THK FK10, Fixed Side Support Unit, φ10mm | THK | Shaft Diameter: φ10mm | Housing Length L: 27mm | H: 10mm | F: 17mm | E: 29.5mm | Housing OD D: 34mm | Inner Dia A: 52mm | PCD: 42mm | Width B: 42mm | Bearing: 7000 equivalent (DF P5) | Mass: 0.21kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK12 | THK FK12, Fixed Side Support Unit, φ12mm | THK | Shaft Diameter: φ12mm | Housing Length L: 27mm | H: 10mm | F: 17mm | E: 29.5mm | Housing OD D: 36mm | Inner Dia A: 54mm | PCD: 44mm | Width B: 44mm | Bearing: 7001 equivalent (DF P5) | Mass: 0.22kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK15 | THK FK15, Fixed Side Support Unit, φ15mm | THK | Shaft Diameter: φ15mm | Housing Length L: 32mm | H: 15mm | F: 17mm | E: 36mm | Housing OD D: 40mm | Inner Dia A: 63mm | PCD: 50mm | Width B: 52mm | Bearing: 7002 equivalent (DF P5) | Mass: 0.39kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK20 | THK FK20, Fixed Side Support Unit, φ20mm | THK | Shaft Diameter: φ20mm | Housing Length L: 52mm | H: 22mm | F: 30mm | E: 50mm | Housing OD D: 57mm | Inner Dia A: 85mm | PCD: 70mm | Width B: 68mm | Bearing: 7204 equivalent (DF P5) | Mass: 1.09kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK25 | THK FK25, Fixed Side Support Unit, φ25mm | THK | Shaft Diameter: φ25mm | Housing Length L: 57mm | H: 27mm | F: 30mm | E: 60mm | Housing OD D: 63mm | Inner Dia A: 98mm | PCD: 80mm | Width B: 79mm | Bearing: 7205 equivalent (DF P5) | Mass: 1.49kg | Type: Fixed Side, Circular Housing (FK) | ||
| FK30 | THK FK30, Fixed Side Support Unit, φ30mm | THK | Shaft Diameter: φ30mm | Housing Length L: 62mm | H: 30mm | F: 32mm | E: 61mm | Housing OD D: 75mm | Inner Dia A: 117mm | PCD: 95mm | Width B: 93mm | Bearing: 7206 equivalent (DF P5) | Mass: 2.32kg | Type: Fixed Side, Circular Housing (FK) |
