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中文Guides on bearing types, designations, standards and selection.
How to Measure a Bearing: Bore, OD and Width
How to measure a bearing with calipers: bore, OD and width — then turn three numbers into the right designation.
October 8, 20266204 vs 6304: Same Bore, Different Capacity
6204 and 6304 both fit a 20 mm shaft, but the 6304 carries roughly 20% more load. Compare dimensions, load ratings and speed limits — and learn when the heavier series is worth it.
October 6, 2026Load Ratings Explained: What C, C0, Cr and C90 Really Mean
Basic dynamic and static load ratings are ISO quantities, but every manufacturer prints its own symbols. A brand-by-brand guide to C/C0, Cr/C0r, Ca/C0a, Ce/Co and Timken's C90 — plus the C0 versus Co glyph trap.
October 1, 2026Bearing Basics: What Bearings Do and How to Use This Site
New to bearings? Learn what a bearing does, the parts it is made of, and how to find your way around Berolix.
September 26, 2026How to Read a Bearing Designation
Decode bearing numbers like 6204-2RS or 6210/C3: type codes, dimension series, bore codes, and the most common prefixes and suffixes.
September 26, 2026Understanding Internal Clearance: CN, C3 and When It Matters
What bearing internal clearance is, why it shrinks in operation, and how to choose between CN, C3 and C4 for temperature, speed and fit conditions.
September 26, 2026Open vs Shielded vs Sealed: Which Bearing Closure to Choose
Open, ZZ metal shields or 2RS rubber seals? Compare friction, speed, protection and relubrication to pick the right closure for your application.
September 26, 2026