Manton's 2001 to Present 6.6L Duramax. M10-1.25 X .620 OD, 12 pt. Jam Nut (D-838)
This rocker arm jam nut is made in the USA from Chromoly Steel, black oxide coated, designed to excel in the most intense applications or everyday use. We also custom-grind this adjusting screw in-house to reduce the diameter of the nut.
