How to find the right Insert Bearings AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Insert Bearings
- Bore and series
- Match the shaft diameter and the housing series. In metric 2xx inserts, the bore is the last two digits times 5 mm from 204 upward (204 = 20 mm, 205 = 25 mm, 206 = 30 mm). The bore must fit the shaft and the outer series must fit the existing housing.
- Locking method
- Use set-screw locking for one-direction, moderate loads. Use eccentric collar for one-direction rotation. Use concentric or adapter-sleeve locking for reversing loads, vibration or high speed. Set screws and eccentric collars loosen or fret the shaft under reversing or shock loads.
- Seals
- Use triple-lip or flinger seals in dirty, wet or agricultural duty, and standard contact seals for clean indoor use. Seal quality is the main difference in life between cheap and good inserts in contaminated environments.
- Shaft condition
- Use a ground or precision shaft within the maker's recommended tolerance, free of burrs and old set-screw marks. An undersized or damaged shaft lets the inner ring creep and wear the shaft.
- Relubricatable or sealed-for-life
- Choose relubricatable inserts for continuous or hot duty, and sealed-for-life for light or intermittent use. Grease life, not fatigue, usually ends an insert's life in heavy service.
Brands that matter
- SKF: Y-bearing (YAR and related) inserts with several locking options.
- NTN: Broad UC-series insert range.
- NSK: Insert bearings to standard UC dimensions.
- Koyo: JTEKT brand with standard insert bearings.
- FYH: Japanese insert and unit specialist.
- Timken: Inserts, including Fafnir-designated ranges.
- Dodge: Inserts for its mounted units, including concentric-locking types.
What to avoid
- Set-screw inserts on reversing or heavily vibrating shafts
- Eccentric collars tightened against the direction of rotation
- Re-using set screws or tightening them onto a previously marked spot on the shaft
- Unbranded inserts with thin single-lip seals for dirty duty
Questions
Can I replace just the insert and keep the housing?
Yes, if the new insert has the same series number and its spherical outer ring seats properly. Replace the housing too if its bore is worn or oval.