Large gasket OD variation · Large gasket ID variation
Baldwin B421 Oil Filter Cross Reference
Use this page to compare the Baldwin B421 with potentially compatible oil filters from other brands. Review thread size, gasket dimensions, overall height, and fitment notes before substituting. A cross reference is a research tool, not an automatic guarantee of fitment.
Before substituting: verify filter style, thread size or cartridge dimensions, gasket dimensions, height, clearance, and application-specific requirements.
Best equivalent matches
The searched filter is shown alongside the four strongest alternatives currently in the database. Compare dimensions, thread details, and compatibility notes before deciding whether a substitute may be appropriate.
12 total results
| Specification | Searched filter Baldwin B421 Reference filter | Champ PH2840Best Match Overall match: 92% SAFE | Overall match: 91% SAFE | Overall match: 90% SAFE | Overall match: 89% SAFE |
|---|---|---|---|---|---|
| Thread size | M20x1.5 | M20x1.5 | M20x1.5 | M20x1.5 | M20x1.5 |
| Gasket OD | 64 mm | 62.7 mm 84% | 64 mm 100% | 61.54 mm 69% | 63 mm 87% |
| Gasket ID | 54.1 mm | 54.6 mm 91% | 54 mm 98% | 55.19 mm 80% | 54 mm 98% |
| Gasket overlap | Reference | Compared to base 100% | Compared to base 100% | Compared to base 100% | Compared to base 100% |
| Height | 72.2 mm | 78.99 mm 74% | 79.38 mm 74% | 65 mm 88% | 86 mm 48% |
| Bypass PSID | 14 | 14 100% | 11 - 14 75% | 14 100% | 14 100% |
| Anti-drainback valve | Yes | Yes 100% | Yes 100% | Yes 100% | Yes 100% |
| ID top | Unknown | Unknown N/A | Unknown N/A | Unknown N/A | Unknown N/A |
| ID bottom | Unknown | Unknown N/A | Unknown N/A | Unknown N/A | Unknown N/A |
Other suitable matches
Large gasket OD variation · Large gasket ID variation
Large gasket OD variation · Large gasket ID variation
Large gasket OD variation · Large gasket ID variation
Large gasket OD variation · Large gasket ID variation
Large gasket OD variation · Large gasket ID variation
87%
match
SAFELarge gasket OD variation · Large gasket ID variation
Large gasket OD variation · Large gasket ID variation
Related compatible filter pages
Frequently asked questions
What replaces Baldwin B421?
Several oil filter alternatives may be compatible with Baldwin B421, but you should always verify thread dimensions, gasket sealing dimensions, bypass behavior, anti-drainback valve requirements, and installation clearance before substituting.
How do I confirm a cross reference for Baldwin B421?
Compare thread size, thread pitch, gasket outside diameter, gasket inside diameter, can height, bypass pressure range, and anti-drainback valve requirements before using a substitute.
Can I use a different-size oil filter instead of Baldwin B421?
Sometimes, but only if thread compatibility, gasket seating, bypass behavior, and physical clearance are all acceptable for the application.
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