What is the thread size of the ph3976a oil filter?
The PH3976A oil filter uses a standard 3/4-16 UNF thread. This size is common on many American-made engines, and it means the filter screws into a 0.75 inch diameter mounting with 16 threads per inch. Always verify with your vehicle's manual or the Purolator cross-reference to ensure exact fit for your engine.
Understanding the thread size
3/4-16 UNF describes both diameter and pitch: 0.75 inches in diameter with 16 threads per inch, using the Unified National Fine (UNF) standard. The "UNF" designation indicates a finer thread pitch than the more common coarse threads (UNC), which can affect how tightly the filter seats and how easily it threads on. For most US-made engines that Purolator targets with the PH3976A, that combination provides a secure seal when paired with the correct gasket and mounting surface.
Compatibility and verification
Use this checklist to verify that PH3976A is the right fit for your vehicle and that the thread and sealing surfaces align with the engine's oil filter mount.
- Consult your vehicle's owner's manual or service guide for the recommended oil filter part number and thread specification.
- Check the PH3976A listing in Purolator's official catalog or a trusted retailer to confirm 3/4-16 UNF threads and compatibility with your engine family.
- Measure the mounting thread on your engine using a thread gauge or caliper to verify 3/4 inch diameter and 16 threads per inch.
- Inspect the gasket size and seating surface to ensure the filter seals properly with the engine's oil filter housing.
- Consider a cross-reference with other brands (e.g., Wix, Motorcraft, Fram) only if their cross-reference confirms PH3976A compatibility for your specific engine.
Following these steps helps prevent misfit issues such as cross-threading or leaks. If there is any doubt, consult a qualified technician or the parts retailer's support line.
Summary
In short, the PH3976A oil filter uses a 3/4-16 UNF thread. This is a common automotive thread size for many American engines, but always verify against your vehicle's specifications and the supplier's catalog to ensure a perfect match.
