5/8-11 x 1-3/4 Inch Coarse Black Oxide Medium Carbon Steel 12 Point Counterbore Bolt Best Seller Air King coupling washers are

Air King coupling washers are made of rubber

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5/8-11 x 1-3/4 Inch Coarse Black Oxide Medium Carbon Steel 12 Point Counterbore Bolt Best Seller Air King coupling washers areCounterbore screws are threaded fasteners that are designed for use in counterbored holes. A counterbored hole is essentially a pilot hole consisting of a long and narrow threaded channel at the bottom and a shallower but wider channel at the top.