Baldwin B403 vs Baldwin B34: Oil Filter Compatibility
Compare Baldwin B403 and Baldwin B34 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 B403 and Baldwin B34 specifications
How matching is scored| Specification | Baldwin B403 | Baldwin B34 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 71.4 mm |
| Gasket ID | 62.7 mm | 62.7 mm |
| Can OD | 93.7 mm | 93.7 mm |
| Height | 206.4 mm | 98.4 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 50 | 8 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD is identical at 71.4 mm.
Gasket ID is identical at 62.7 mm.
Baldwin B403 is 108 mm taller (Baldwin B403: 206.4 mm, Baldwin B34: 98.4 mm) -- check clearance before substituting.
Can OD is identical at 93.7 mm.
Both open their bypass valve in a comparable range: Baldwin B403 at 50-50 psi, Baldwin B34 at 8-8 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.