K&N HP-1004 vs Baldwin B474: Oil Filter Compatibility
Compare K&N HP-1004 and Baldwin B474 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
Candidate adds ADBV
- 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 B474 specifications
How matching is scored| Specification | K&N HP-1004 | Baldwin B474 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 62 mm | 62.7 mm |
| Gasket ID | 54 mm | 54.8 mm |
| Can OD | 80 mm | 76.2 mm |
| Height | 87 mm | 89.7 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 11 - 17 | 8 |
| Anti-drainback valve | Yes | No |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 0.7 mm (K&N HP-1004: 62 mm, Baldwin B474: 62.7 mm).
Gasket ID differs by 0.8 mm (K&N HP-1004: 54 mm, Baldwin B474: 54.8 mm).
Baldwin B474 is 2.7 mm taller (K&N HP-1004: 87 mm, Baldwin B474: 89.7 mm) -- check clearance before substituting.
Can OD differs by 3.8 mm (K&N HP-1004: 80 mm, Baldwin B474: 76.2 mm).
Both open their bypass valve in a comparable range: K&N HP-1004 at 11-17 psi, Baldwin B474 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.