Grade 8 Black Oxide Steel Flanged Head Bolts, Partially Threaded, 1/4"-20 Thread x 2.50" Length

Flange Diameter 9/16", Head Width 3/8", Head Height 9/32", Partially Threaded, Thread Length 3/4" to 1-3/16", Tensile Strength 180,000 psi. Often used in heavy duty applications these screws have a flange that eliminates the need for a separate washer. The black oxide finish has mild corrosion resistance in dry environments. Head height includes the flange. Length is measured from under the flange.