4-40 K Lock Nut 18-8 Stainless Steel Nut 420 Stainless Steel Washer (Pack Qty 2 000) BC-04NK188

PICTURES ARE REPRESENTATIVE OF ITEM BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions finish head markings thread length stamping shape or forging shape etc. may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape which can vary from lot to lot. Designed to be inserted into a like-sized hollow recess of a socket screw to manually tighten or loosen the fastener. Alloy steel containing at least two of the following elements: chromium nickel molybdenum or vanadium in sufficient quantity to assure that the minimum surface hardness meets the standards listed below.