Carriage Bolt Inch Neck Type Square Basic Material Steel Material Grade Grade 8 Fastener Finish Plain Dia/Thread Size 3/8 In.-16 Fastener Length 2 1/2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.5 SAE J429 Drill Size 25/64 in Head Dia 0.844 in Head Height 13/64 in Head Type Round Square Height 0.219 in Square Width 0.388 in Tensile Strength 150 000 psi For Use With Grade 8 Hex Nuts Package Quantity 100