Metallics JFM44 1/4-20 x 5/8 in. Flat Head Slotted Machine Screws - Steel Zinc - Each

Yes. The JFM44 is a 1/4-20 UNC screw, 20 threads per inch, cut to ANSI/ASME B1.1. Any 1/4-20 tapped hole, strut nut, or ground lug takes it. Usable length is 5/8 inch, measured from under the flat head since this is a countersunk head.

1900 lb minimum tensile is the rated figure for the JFM44. Material is low carbon steel in the AISI 1006 to 1022 range at Rockwell B70 to B100 hardness. That is commercial-grade fastener stock, fine for fixture mounting, enclosure covers, strut and device work. It is not a graded structural bolt, so don't substitute it where a Grade 5 or Grade 8 is called out on the drawing.

Zinc finish over steel is a dry-location plating. It handles indoor panel, fixture and enclosure work, but it will rust where there is standing moisture, washdown, or coastal air. For exterior or damp locations, step up to a stainless machine screw in the same 1/4-20 x 5/8 size.

They come in a jar of 100, and 100 count is the order minimum. The jar weighs 0.93 lbs and measures 3 in by 3 in by 2.15 in, so it stores easily on a van shelf or in a job box.

The JFM44 carries both an ARRA compliance and Buy American compliance flag on its record. Country of origin is China. On federally funded work the compliance designation and the origin both get reviewed, so hand both facts to your specifier before you submit.

Flat head is the one to use when the fastener has to finish flush, into a countersunk cover plate, trim ring, or a surface something slides across. A pan or round head sits proud and gives you more bearing area on a plain drilled hole instead. The JFM44 is the flush option: flat head, slotted drive, in the Metallics FM and FMP machine screw series.