K&N HP-1004 vs Baldwin B1425: Oil Filter Compatibility
Compare K&N HP-1004 and Baldwin B1425 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.
K&N HP-1004 and Baldwin B1425 specifications
How matching is scored| Specification | K&N HP-1004 | Baldwin B1425 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 62 mm | 64 mm |
| Gasket ID | 54 mm | 54.1 mm |
| Can OD | 80 mm | 77 mm |
| Height | 87 mm | 87.3 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 11 - 17 | 20 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 2 mm (K&N HP-1004: 62 mm, Baldwin B1425: 64 mm).
Gasket ID differs by 0.1 mm (K&N HP-1004: 54 mm, Baldwin B1425: 54.1 mm).
Baldwin B1425 is 0.3 mm taller (K&N HP-1004: 87 mm, Baldwin B1425: 87.3 mm) -- check clearance before substituting.
Can OD differs by 3 mm (K&N HP-1004: 80 mm, Baldwin B1425: 77 mm).
Both open their bypass valve in a comparable range: K&N HP-1004 at 11-17 psi, Baldwin B1425 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.