Baldwin B129 vs Donaldson P550362: Oil Filter Compatibility
Compare Baldwin B129 and Donaldson P550362 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a 1-12 thread.
Quick verdict
Closest known dimensional difference: height -9.3 mm. Verify application-specific requirements before substituting.
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
Baldwin B129 and Donaldson P550362 specifications
How matching is scored| Specification | Baldwin B129 | Donaldson P550362 |
|---|---|---|
| Thread size | 1-12 | 1-12 |
| Gasket OD | 72 mm | 72 mm |
| Gasket ID | 61 mm | 62 mm |
| Can OD | 108 mm | 95 mm |
| Height | 187.3 mm | 178 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 30 | 30 - 42 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 1-12.
Gasket OD is identical at 72 mm.
Gasket ID differs by 1 mm (Baldwin B129: 61 mm, Donaldson P550362: 62 mm).
Baldwin B129 is 9.3 mm taller (Baldwin B129: 187.3 mm, Donaldson P550362: 178 mm) -- check clearance before substituting.
Can OD differs by 13 mm (Baldwin B129: 108 mm, Donaldson P550362: 95 mm).
Both open their bypass valve in a comparable range: Baldwin B129 at 30-30 psi, Donaldson P550362 at 30-42 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.