FRAM PH6607 vs Baldwin B1421: Oil Filter Compatibility
Compare FRAM PH6607 and Baldwin B1421 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 M20x1.5 thread.
Quick verdict
Both use a M20x1.5 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.
FRAM PH6607 and Baldwin B1421 specifications
How matching is scored| Specification | FRAM PH6607 | Baldwin B1421 |
|---|---|---|
| Thread size | M20X1,5 | M20x1.5 |
| Gasket OD | 62.5 mm | 64 mm |
| Gasket ID | 55 mm | 54.1 mm |
| Can OD | 68 mm | 77 mm |
| Height | 67 mm | 87.3 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 14.504 | 14 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 1.5 mm (FRAM PH6607: 62.5 mm, Baldwin B1421: 64 mm).
Gasket ID differs by 0.9 mm (FRAM PH6607: 55 mm, Baldwin B1421: 54.1 mm).
Baldwin B1421 is 20.3 mm taller (FRAM PH6607: 67 mm, Baldwin B1421: 87.3 mm) -- check clearance before substituting.
Can OD differs by 9 mm (FRAM PH6607: 68 mm, Baldwin B1421: 77 mm).
Both open their bypass valve in a comparable range: FRAM PH6607 at 14.504-14.504 psi, Baldwin B1421 at 14-14 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.