It is best to use these with smaller bolt heads and in applications where there is a desire to not have exposed teeth.Size: 7/16 inchFeatures teeth that extend inwardPrevents loosening of bolt or nut by biting into surfaceBest to use on bolts or screws with smaller headsPreferable over external tooth lock washers in cases where teeth need to be hiddenSpecification(s) Met: ASME B18.21.1 Type A For maximum holding power, use one between the surface and the bolt head, and use another one between the surface and the nut.
5000.Screw Machine Drill Bit, Drill Bit Size 1/2 in, Drill Bit Point Angle 140 Degrees , R Thinning Point, Carbide, WD1, Coolant Through, Cutting Direction Right Hand, Decimal Equivalent 0.
Screw Machine Drill Bit, Drill Bit Size 12.10 mm, Drill Bit Point Angle 140 Degrees , Carbide, Coolant Through, Cutting Direction Right Hand, Decimal Equivalent 0.