Mercury MerCruiser 11-34933 11-22178 11-21298 MR Alpha Drive 7/16”-20 Stainless Steel Lock Nut Sierra 18-3721

Mercury MerCruiser MR Alpha Drive 7/16”-20 Stainless Lock Nut
Material: Stainless Steel
Thread Size: 7/16" or 11.1mm - 20
For use with:
- MR/Alpha Drives
- MCM inner transom studs and prop nut for Mercury 39, 60 (1968 & Newer, 8 spline)
Manufacturer: Sierra
Model Number: Lock Nut
Part Number: 18-3721
Also Known As:
- Mercruiser Stern Drive 11-21298, 11-22178, 11-24648, 11-29241, 11-33962, 11-34933, 11-82671015
- Mercury Marine 11-134391, 11-22178, 11-34933, 11-46355, 11-82671015, 11-859116, 11-95702
- Mallory 9-72004, 9-72004-10
- GLM 21170