Japan Origin THK BF25 Ball Screw Side Support Unit Square Type

The THK BF25 is a square-type fixed-end or supported-side ball screw support unit designed for a 25mm shaft diameter, utilizing a deep-groove ball bearing to stabilize rotating machine components

Model:

BF 25

Inner Diameter (ID):

25 mm

Outer Diameter (OD):

30 mm

Width:

106 mm

Structure:

Ball screw side support

Cage:

Steel cage

Clearance Class:

C3 enlarged radial clearance

Design:

Angular contact

Material:

High carbon chromium bearing steel

Seal Type:

Open type

Basic Dynamic Load Cr:

14 KN

Basic Static Load C0r:

7.85 N

Limiting Speed:

12900 r/min

Weight:

1.42 kg

👉 Full technical data and drawings available upon request

• Separable inner/outer ring for convenient installation, disassembly and maintenance
• E reinforced roller structure greatly improves heavy radial load capacity
• Solid brass M1A cage stable under high speed and high temperature operation
• C4 enlarged clearance adapts high temperature expansion and heavy interference fit
• XL optimized internal structure reduces friction, lowers running heat
• Precision ground raceway and rollers ensure low vibration stable rotation
• Custom clearance, precision grade and cage materials are available

This bearing is widely used in:

• Industrial speed reducer and gearbox assemblies
• Medium-large drive motor rotary components
• Conveyor, crusher and heavy transmission machinery
• General heavy-load industrial rotary equipment with thermal expansion demand

• 25+ years experience in industrial cylindrical roller bearing manufacturing
• Exported to 50+ countries worldwide
• Rich experience in OEM special code custom bearing projects
• Strict dimension, hardness and dynamic load inspection before shipment
• Fast response within 24 hours
• Stable supply for long‑term cooperation

• Raw bearing steel incoming inspection
• Ultra-precision superfinishing for rollers and raceway
• Strict heat treatment hardness control
• Clearance grouping, rotation noise and durability testing
• Full dimension tolerance inspection before delivery

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