Baldwin B252 vs FRAM HPH1: Oil Filter Compatibility
Compare Baldwin B252 and FRAM HPH1 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 3/4-16 thread.
Quick verdict
Both use a 3/4-16 thread.
- 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 B252 and FRAM HPH1 specifications
How matching is scored| Specification | Baldwin B252 | FRAM HPH1 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 71.1 mm |
| Gasket ID | 62.7 mm | 62.5 mm |
| Can OD | 93.7 mm | 93.7 mm |
| Height | 138.9 mm | 142.1 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 20 | 22 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.3 mm (Baldwin B252: 71.4 mm, FRAM HPH1: 71.1 mm).
Gasket ID differs by 0.2 mm (Baldwin B252: 62.7 mm, FRAM HPH1: 62.5 mm).
FRAM HPH1 is 3.2 mm taller (Baldwin B252: 138.9 mm, FRAM HPH1: 142.1 mm) -- check clearance before substituting.
Can OD is identical at 93.7 mm.
Both open their bypass valve in a comparable range: Baldwin B252 at 20-20 psi, FRAM HPH1 at 22-22 psi -- these ranges do not overlap.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.