Metallics JG5HSF1434 Bolt 1/4-20 x 3/4 Ind Hx Hd Serr Fl (Jar 100)

It's a 1/4-20 x 3/4 inch bolt, so 1/4 inch diameter with 20 threads per inch (standard UNC coarse thread for that diameter) and a 3/4 inch length under the head. The indented hex head carries a serrated flange, which bites into the mating surface and resists loosening without a separate washer.

No. The serrated flange under the hex head spreads the load like an integral washer and the serrations dig into the joint face to keep the bolt from backing out under vibration. That's the point of the design, and it cuts a loose part out of the install. If you're fastening into soft or finished material you don't want marred, use a plain hex bolt and a flat washer instead.

100 pieces, packed in a jar rather than a box or bag. The jar keeps the count contained on a cart or in a van bin, which is why this is the usual way these small electrical fasteners get bought for strut, box, and enclosure work.

Order by Metallics MPN JG5HSF1434. That number covers the 1/4-20 x 3/4 indented hex head serrated flange bolt in the 100 count jar, and it's the only configuration under it, so there's no size or finish option to specify.

That's what it's stocked for. Metallics sells it as an electrical fastener, and a 1/4-20 serrated flange bolt is the standard pick for mounting brackets, covers, box hardware, and strut assemblies where vibration would work a plain bolt loose. The 3/4 inch length suits thin sheet metal and bracket thicknesses rather than deep stacks.