Attached Free Spinning Washer Provides Extra Hold -- Standard Keps Nuts have an External Tooth Lockwasher, Conical Keps Nuts have Conical Washers.
Applications: This is the most popular type of locknut because of its versatility, cost and ease of installation. Doesn’t gall screw threads.
Materials: Steel: Nuts-- AISI 1008-1020 or equivalent steel; Washers-- 1050-03 or equivalent steel.
stainless steel: Nuts-- One of the following austenitic alloys: 302, 303, 303Se, 304, XM7; Washers-- 420 stainless.