Metallics JG5HSF141 Bolt 1/4-20 x 1 Ind Hx Hd Serr Flan (Jar 100)

No separate washer is needed. The flange under the hex head spreads the clamp load the way a washer would, and the serrations on the underside bite into the mating surface to resist back-off from vibration. That's why flange bolts are common on strut, enclosures, and equipment mounting where you don't want loose hardware rattling out. Serrations do mar the surface they seat against, so on a finished or painted face you may still want a plain hex bolt and washer instead.

For strut and most sheet-metal or channel work, 1 inch of length gives you enough reach for the channel wall plus a nut or strut nut while still leaving thread engagement. If you're stacking a clamp, a bracket, and the channel, measure your total grip length first, a 1 inch bolt only works when the combined thickness plus nut height falls inside that. Thicker build-ups need a longer 1/4-20.

Order Metallics part number JG5HSF141. That number covers the 1/4-20 x 1 inch indented hex head serrated flange bolt in the 100 piece jar, so it's the single reference to put on a purchase order or a counter ticket.

These ship 100 pieces in a jar, which is how Metallics packages its small electrical fasteners for van stock and shop benches. One jar covers 100 fastening points, so figure your quantity on the count of holes, not the count of assemblies.

It takes a hex socket or wrench on the indented hex head, 7/16 inch across the flats for a standard 1/4-20 hex head. The indented head profile means a six-point socket seats better than an open-end wrench, and an impact or nut driver with a 7/16 socket is the fastest way to run a jar of them on repetitive mounting work.