Bearing Standards
The ISO standards this bearing database is built on: which numbers come from a standard, which come from a manufacturer catalogue, and where each one is tabulated.
The standards behind this librarywhat each one fixes, and where to read it
All bearings| Standard | Edition | Title |
|---|---|---|
| ISO 15 | ISO 15:2011 | Boundary dimensions, general plan |
| ISO 5753-1 | ISO 5753-1:2009 | Radial internal clearance |
| ISO 582 | ISO 582:1995 | Chamfer dimension limits |
| ISO 492 | ISO 492:2023 | Tolerance classes and symbols |
| ISO 281 | ISO 281:2007 | Rating life, and why no ratings appear here |
| ISO 1206 | ISO 1206:2023 | Needle roller boundary dimensions |
| ISO 3245 | ISO 3245:2023 | Drawn cup boundary dimensions |
Every designation page in this library names the plan its own numbers are tabulated to, and links the rest from its sidebar. Between them those plans cover all 764 pages — ISO 15 (397), ISO 104 (41), ISO 355 (38), ISO 1206 (188) and ISO 3245 (100); ISO 104 and ISO 355 have no page of their own here yet, so they are named on the pages that use them rather than linked from the table above. Until now the citations were plain text, because the main standards index is built around fastener product standards — a page whose subject is a bore × pitch × length table. A bearing standard is a different shape of document, so it gets its own page and its own treatment here rather than being forced into that template.
Where a table is missing, and whyeach of these pages says so rather than leaving a gap
- ISO 582
- Chamfer limit values — The 1979 edition gave each minimum a single maximum; the 1995 edition made the maximum depend on bore. Two editions cannot share one column, so the page gives the ISO 15 minimums and the rule that actually governs a design, and names the edition a reader has to check.
- ISO 492
- Tolerance values — The 2023 edition replaced the 2014 one, revised the symbol system and extended the limits over larger diameters, so figures quoted without their edition disagree with each other in ways a reader cannot detect from the table itself. The page records the classes and the symbols, which are stable, and stops there.
- ISO 281
- Load ratings and the reliability factors used with them — This standard defines how a rating is calculated from internal geometry; it does not supply the number. That is the reason no load rating appears anywhere in this database.