8-18X3/4 Unslotted Hex Washer Bonded NEO EPDM Washer Self Drill Full Thread Zinc 1000hrs Salt (Pack Qty 2,000) BC-0812KWNHC

$174.86
SKU:
BC-0812KWNHC
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Description

Unslotted Hex Washer Bonded NEO EPDM Washer Self Drill Full Thread Zinc 1000hrs Salt

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"