FRAM HP4 vs Baldwin BT344-S: Oil Filter Compatibility
Compare FRAM HP4 and Baldwin BT344-S 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
Both use a 13/16-16 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.
FRAM HP4 and Baldwin BT344-S specifications
How matching is scored| Specification | FRAM HP4 | Baldwin BT344-S |
|---|---|---|
| Thread size | 13/16-16 | 13/16-16 |
| Gasket OD | 71 mm | 71.4 mm |
| Gasket ID | 62 mm | 62.7 mm |
| Can OD | 95 mm | 94.5 mm |
| Height | 111 mm | 113.5 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 22 | 20 |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are 13/16-16.
Gasket OD differs by 0.4 mm (FRAM HP4: 71 mm, Baldwin BT344-S: 71.4 mm).
Gasket ID differs by 0.7 mm (FRAM HP4: 62 mm, Baldwin BT344-S: 62.7 mm).
Baldwin BT344-S is 2.5 mm taller (FRAM HP4: 111 mm, Baldwin BT344-S: 113.5 mm) -- check clearance before substituting.
Can OD differs by 0.5 mm (FRAM HP4: 95 mm, Baldwin BT344-S: 94.5 mm).
Both open their bypass valve in a comparable range: FRAM HP4 at 22-22 psi, Baldwin BT344-S at 20-20 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.