Door lock knob replacement designed to restore reliable operation and a secure fit for compatible vehicle door locks. Key features and benefits Exact fit specifications: 2.22 x 0.31 in / 56.4 x 8 mm, thread size M5x1.0. OEM Number FODZ5421850A. Durable construction: Made from ABS plastic for long service life. Resists water, UV exposure, and common wear to keep operation consistent over time. Secure threaded design: Precision internal threads increase frictional engagement with the lock mechanism to reduce the chance of the knob loosening or detaching during use. Tool installation: Simple replacement procedure that requires no special tools. Remove the old knob and insert the lock pin into the door lock lifting position. The knob retracts when the door is locked and pops out when unlocked for normal operation. Clear compatibility: Verify OEM Number FODZ5421850A and vehicle specification before ordering to ensure proper fit. Compatible models Ford F150: 20112014 with 3.5L V6, 3.7L V6, 5.0L V8, 6.2L V8; 20092010 with 4.6L V8, 5.4L V8; 20062008 with 4.2L V6, 4.6L V8, 5.4L V8; 2005 with 4.2L V6, 4.6L V8, 5.4L V8; 2004 with 4.6L V8, 5.4L V8. Explorer: 19911995 with 4.0L V6; 1996 with 4.0L V6 and 5.0L V8. Mercury Sable: 19921995 with 3.0L V6 and 3.8L V6. Typical use scenarios a cracked or worn interior door lock knob after years of daily use to restore smooth locking and unlocking. Complete a door lock where the lock mechanism has been serviced but the original knob is damaged or missing. Install as a spare part for fleet or work vehicles that require durable components and quick maintenance turnarounds. What to check before ordering Confirm the vehicle year and engine option match the compatibility list. Confirm OEM Number FODZ5421850A and thread size M5x1.0 for an exact replacement. This replacement door lock knob offers a straightforward, durable solution to restore proper door lock function while maintaining a secure fit and easy installation.