Metallics JG5HSF143 Bolt 1/4-20 x 3 Ind Hx Hd Serr Fla (Jar 100)

The serrated flange on the JG5HSF143 takes the place of a separate washer. The flange spreads the clamp load over a wider bearing area and the serrations bite into the mating surface to resist loosening from vibration, which is why these are common on electrical enclosures, strut, and sheet metal work. If you are fastening into soft or finished material you may still want a washer to avoid the serrations marring it.

100 pieces per jar. That's the stock pack, so a single order quantity gets you a full jar of 100 of the 1/4-20 x 3 inch serrated flange hex bolts rather than a loose count.

Order Metallics part number JG5HSF143. That's the full jar of 100, 1/4-20 x 3 inch indented hex head with serrated flange.

At 3 inches of length under the head you have room for a fairly deep assembly, but how much depends on your nut and thread engagement. A rule of thumb for a 1/4-20 is to leave at least one diameter of thread engaged in the nut, so plan on roughly 1/4 inch plus the nut height consumed at the far end and size the grip from what's left. For thinner joints, a shorter length in the same 1/4-20 serrated flange style is the cleaner choice so you aren't trimming or burying excess thread.