12-14X4 Unslotted Hex washer w/Bonded NEO EPDM Washer Self Drill Screw Full Thread Zinc (Pack Qty 500) BC-1264KWN

A hex washer head tapping screw with spaced threads and a drill point which drills its own hole. Beneath the head is a thin conically-shaped circular steel washer, bonded to a similarly shaped rubber-like piece which as a slightly smaller outside and inside diameter. When these washers are assembled (rubber side down) to self-piercing or self-drilling screws, those fasteners become "sealing screws" When properly assembled, this washer: (a) offers protection against leakage; (b) provides load bearing qualities superior to that of a regular flat washer; (c) reduces the chance of the fastening becoming loose due to vibration; (d) minimizes damage to th There is no single standard for Neo-EPDM washers. These values are offered as a guide; deviations from these specifications may occur