Baldwin Filters
Baldwin Filters B1421 Oil Filter Spin-On 18 Micron M20-1.50
Spin-on oil filter rated at 18 micron with M20-1.50 threads for Acura and Honda vehicles
- ColorTransparent
- 18 micron rating captures fine contaminants
- Spin-on design allows quick tool-free replacement
- 14 psid bypass valve maintains flow under pressure
- Anti-drainback valve prevents dry starts
- M20-1.50 thread fits Acura and Honda engines
Application fit
The Baldwin Filters B1421 is a spin-on oil filter designed for Acura and Honda automotive engines. It threads onto an M20-1.50 mounting point and uses an 18 micron rating to trap contaminants during normal service intervals. The compact canister suits tight engine bays where larger cartridges cannot fit. Buyers who need a cartridge-style element or a different thread pitch cannot use this unit.
Sustained operation
A 14 psid bypass valve opens if the media loads up under extended running, maintaining oil flow to critical bearings. The anti-drainback valve holds oil in the filter after shutdown, reducing dry-start wear on the next ignition. Both valves operate mechanically without electronic controls, so behaviour stays consistent through heat cycles. No sensor feedback or service indicator is provided.
Installation notes
Spin the filter on by hand until the gasket contacts the base, then tighten roughly three-quarters of a turn more. The transparent housing lets you verify gasket seating before final torque. Over-tightening can distort the canister and cause leaks, while under-tightening risks the filter backing off under vibration. No special tools or adapters are required for the M20-1.50 thread.
Highlights
- 18 micron rating captures fine contaminants
- Spin-on design allows quick tool-free replacement
- 14 psid bypass valve maintains flow under pressure
- Anti-drainback valve prevents dry starts
- M20-1.50 thread fits Acura and Honda engines
Specifications
| Brand | BALDWIN FILTERS |
|---|---|
| Color | Transparent |
Questions about this item
How much pressure does the 14 psid bypass valve relieve before unfiltered oil reaches the engine?
The built-in bypass valve opens at 14 psid, allowing oil to flow around the element if the filter becomes clogged or the oil is too cold.
Which thread size must the engine block have for this M20-1.50 filter to seal correctly?
The engine block must provide an M20 x 1.50 thread for the spin-on base to engage and seal properly.
Will the 3-7/16 in. height and 3-1/32 in. diameter fit the same mounting space as the original Acura or Honda filter?
Yes, the 3-7/16 in. height and 3-1/32 in. outside diameter match the OE dimensions specified for Acura and Honda applications.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
