Serrated Flange Screws, Serrated Flange Bolts and commonly known by their trade name as Whiz-Lock Bolts, are unslotted hex head flange screws that have serrations under the flange, or on the bearing surface. The flange provides more strength than a regular hex screw, and in some applications, the serrations eliminate the need for lock washers or lock nuts.

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HodellOHFlange Screw w serr. (Whiz-Lock eq.)SteelZinc/Clear3/8-16 x 1 3/43/8-16 x 1 3/4 hardened serr flange scr zn trivalent zinc head dimensions to ifi 111 full thread3,001

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