Baldwin B30 vs Champ PH51A: Oil Filter Compatibility
Compare Baldwin B30 and Champ PH51A 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 13/16-16 thread.
Quick verdict
Candidate adds ADBV
- 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 B30 and Champ PH51A specifications
How matching is scored| Specification | Baldwin B30 | Champ PH51A |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 69.9 mm | 70.6 mm |
| Gasket ID | 60.9 mm | 62.2 mm |
| Can OD | 76.2 mm | 74.68 mm |
| Height | 130.2 mm | 78.99 mm |
| Internal bypass valve | No | No |
| Bypass PSID | Not applicable | Not applicable |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 0.7 mm (Baldwin B30: 69.9 mm, Champ PH51A: 70.6 mm).
Gasket ID differs by 1.3 mm (Baldwin B30: 60.9 mm, Champ PH51A: 62.2 mm).
Baldwin B30 is 51.2 mm taller (Baldwin B30: 130.2 mm, Champ PH51A: 78.99 mm) -- check clearance before substituting.
Can OD differs by 1.5 mm (Baldwin B30: 76.2 mm, Champ PH51A: 74.68 mm).
Anti-drainback valve differs: Champ PH51A has one, Baldwin B30 does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.