Knowledge Base
Bearing Knowledge
Engineering-grounded guides assembled from a multi-source industrial research corpus — capabilities, materials, process limits and sourcing practice.
Buying Decisions
Procurement questions answered from a multi-source evidence base — what changes a quote, which process or material to pick, what to confirm before ordering.
2RS vs ZZ Bearings: How to Choose When Dust Meets Speed
Decide the environment first: if fine dust or moisture reaches the bearing, 2RS contact seals protect better, but they cost friction and 20-30% of the…
Can a Domestic Bearing Replace an Imported One? Six Parameters to Check
A matching ABEC/P class is not proof of equivalence — it fixes dimensional tolerance and running accuracy only.
Cylindrical Roller vs Deep Groove Ball Bearing: When the Load Case Decides
A cylindrical roller bearing beats a deep groove ball bearing of the same bore when the load is heavy and purely radial, because line contact carries…
Deep Groove vs Angular Contact Ball Bearings: How to Choose
Start with the axial-to-radial load ratio: if the axial component stays inside roughly 20-30% of the radial rating and reverses direction, a deep groove…
GCr15 vs 52100: What to Verify Before You Accept the Substitution
Published chemistry says GCr15 and 52100 are near-identical, but no source in this evidence set maps GB/T 18254 to ASTM A295, so the grade name alone cannot…
High-Speed Motor Bearings: How to Choose Type, Cage, Clearance and Shaft-Current Protection
Start with the bearing family: ball bearings, not roller, because point contact runs cooler and reaches a higher limiting speed.
How to Combine Bearing Steel, Clearance, Seal and Grease for a Hot Position
Specify the combination against the true bearing temperature, not the housing reading, and treat the grease as the element that expires first.
How to Replace a Bearing Model: Decode, Match, Verify
Start by decoding the designation; if it is unreadable, measure bore, outside diameter and width and route the match through a cross-reference.
How to Size a Bearing from Load Rating and L10 Life
Size the bearing from the equivalent dynamic load of the duty cycle, not the peak load, then back-calculate the minimum dynamic load rating C that meets…
P0 vs P6 vs P5 vs P4 Bearings: What the Step-Up Actually Buys
A tighter ISO class (P6, P5, P4) tightens boundary-dimension and runout tolerance bands — nothing else.
Tapered Roller Bearings for Combined Loads: When to Specify Them and How to Configure the Pair
Specify a tapered roller bearing when the combined load is heavy and the axial component acts in one direction, then check the speed ceiling before you…
What a Bearing RFQ Must Contain for an Accurate Quote
A bearing RFQ that carries only a part number will come back with a price for the wrong part.
When Should You Specify C3 Instead of CN Bearing Clearance?
Specify C3 when the interference fit and the inner-ring-to-outer-ring temperature differential together would drive the operating clearance to zero or…
Why Do Visually Identical Bearings Differ in Price?
Two quotes for the same bearing part number usually differ for one of six reasons: precision class, material, cage/seal/lubrication configuration, source…