12-14X4 Unslotted Indent Hex washer Self Drill Screw Full Thread Zinc 1000hours Salt Spray (Pack Qty 500) BC-1264KWHC

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 the mating surface caused b y contact with a steel washer. Sealing screws may be used to attach roofing or metal walls to steel frames. Consult a self-drilling screw selection chart for the correct size Screw: AISI 1016-1024 or equivalent steel; Steel Section of washer: 20 gauge steel; Elastic Section of washer: Style 40 EPDM sheet Screws shall be quenched in liquid and then tempered by reheating to 625° F minimum. Washer: EPDM material: Shore A 65 - 75 (Durometer scale)