Baldwin BT339 vs Donaldson P502503: Oil Filter Compatibility
Compare Baldwin BT339 and Donaldson P502503 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 1-16 thread.
Quick verdict
Both use a 1-16 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 BT339 and Donaldson P502503 specifications
How matching is scored| Specification | Baldwin BT339 | Donaldson P502503 |
|---|---|---|
| Thread size | 1-16 | 1-16 |
| Gasket OD | 71.4 mm | 67 mm |
| Gasket ID | 62.7 mm | 62 mm |
| Can OD | 93.7 mm | 93 mm |
| Height | 181 mm | 165 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 11 - 17 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 1-16.
Gasket OD differs by 4.4 mm (Baldwin BT339: 71.4 mm, Donaldson P502503: 67 mm).
Gasket ID differs by 0.7 mm (Baldwin BT339: 62.7 mm, Donaldson P502503: 62 mm).
Baldwin BT339 is 16 mm taller (Baldwin BT339: 181 mm, Donaldson P502503: 165 mm) -- check clearance before substituting.
Can OD differs by 0.7 mm (Baldwin BT339: 93.7 mm, Donaldson P502503: 93 mm).
Bypass valve presence differs: Donaldson P502503 has one, Baldwin BT339 does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.