Frame Bolts are hex washer head bolts with a flat washer bearing surface. They are made from high-alloy steel, and commonly used on truck frames, hence the name frame bolt. The flange eliminates the need for washers. They are covered under ANSI Standard B18.2.1

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Kanebridge ILFlange Screw w/o serr. (Frame Bolt)Grade 8Phosphate7/16-20 x 17/16-20x1 hex head flange non serrated frame bolt ifi 111 2002 grade 8 black phosphate15,000

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