NU205ECP is a useful boundary test because the beginning of the code follows a common cylindrical roller bearing pattern, while the ECP suffix should not be expanded without manufacturer context. Use the Bearing Number Decoder to keep those two jobs separate.
Segment breakdown
| Segment | Decoder reading | Boundary |
|---|---|---|
| NU | NU type cylindrical roller bearing. | Exact ring flange arrangement and design details need catalog context. |
| 205 | NU2 series with 05 bore code, giving 25 mm bore. | Full dimensions are not derived from bore alone. |
| ECP | Manufacturer-specific design suffix. | Do not assign a universal meaning without the brand catalog. |
Bore code in NU205
The 05 at the end of the numeric part follows the common multiply-by-five rule, so the parser returns a 25 mm bore. The 2 before it is treated as part of the cylindrical roller series/base, not as the bore code.
Why ECP stays qualified
ECP can carry maker-specific design, cage, or internal construction meaning. The decoder preserves the suffix and flags it as manufacturer-specific. That is deliberate: a wrong suffix expansion is worse than a visible unresolved suffix.
Verification checklist
- Confirm the brand or catalog family.
- Verify the exact NU205ECP catalog row.
- Check dimensions, cage, internal design, load, speed, clearance, and lubrication.
- Do not substitute another NU205 variant unless the maker data supports it.
Source and limits
Sources: open-source bearing CSV tables from gumyr/cq_warehouse (Apache-2.0), plus NSK bearing designation guidance, JTEKT/Koyo bearing number tables, SKF designation guidance, ISO rolling bearing references including ISO 5753-1 for radial internal clearance, and ANSI/ABMA tapered roller bearing references; verified 2026-08-30.
- This content explains the imported bearing database first, then the parser fallback for supported patterns that are not in the exact table.
- Exact database rows preserve the imported dimensions and suffix notes, but they still do not replace the maker catalog for procurement, maintenance, or safety decisions.
- Bore code parsing does not decide outside diameter, width, cage material, lubrication, fit, load rating, or interchangeability.
- Metric tapered roller and inch-design tapered roller bearings use separate designation systems, so verify the exact catalog entry before purchase or maintenance work.
Related bearing guides
How to Read Bearing Numbers | Bearing Bore Code and Dimensions | Bearing Number Reference Set Limits