Specifications:

• FK12 (Fixed-end bearing):
• Bearing type: Angular contact bearing
• Internal bearing model: Usually 7001 or 7002
• Mounting holes: 4 holes
• Mounting pattern: Square
• Application: Mounted at the motor side (fixed support)
• FF12 (Floating-end bearing):
• Bearing type: Deep groove ball bearing
• Internal bearing model: 6001 or 6002
• Mounting holes: 4 holes
• Mounting pattern: Square
• Application: Free-end support to allow axial movement
• Compatibility: For SFU1604, SFU1605 ball screws (16mm diameter)
• Material:  Steel/aluminum
• Precision:  High for smooth, accurate linear motion
• Dimensions:  FK12 and FF12 typically have the same outer dimensions but different bearing internals.