Bosch 3402 vs Baldwin B34: Oil Filter Compatibility
Compare Bosch 3402 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.
Bosch 3402 and Baldwin B34 specifications
How matching is scored| Specification | Bosch 3402 | Baldwin B34 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71 mm | 71.4 mm |
| Gasket ID | 62 mm | 62.7 mm |
| Can OD | 94.01 mm | 93.7 mm |
| Height | 95.25 mm | 98.4 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 - 16 | 8 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 0.4 mm (Bosch 3402: 71 mm, Baldwin B34: 71.4 mm).
Gasket ID differs by 0.7 mm (Bosch 3402: 62 mm, Baldwin B34: 62.7 mm).
Baldwin B34 is 3.2 mm taller (Bosch 3402: 95.25 mm, Baldwin B34: 98.4 mm) -- check clearance before substituting.
Can OD differs by 0.3 mm (Bosch 3402: 94.01 mm, Baldwin B34: 93.7 mm).
Both open their bypass valve in a comparable range: Bosch 3402 at 8-16 psi, Baldwin B34 at 8-8 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.