Metallics JSPMP44SS Screws 1/4-20 X 5/8 Pn Ph MS SS (Jar 100)

They are 1/4-20 by 5/8 inch pan head Phillips machine screws. The 1/4-20 means a 1/4 inch diameter with 20 threads per inch, so they thread into a tapped 1/4-20 hole or take a 1/4-20 nut. The 5/8 inch length is measured on the shank under the pan head, since pan heads sit on top of the surface rather than countersinking.

Yes, the JSPMP44SS is a stainless steel machine screw, which is why electricians and maintenance crews use it for damp locations, exterior enclosures, and wash-down areas where a plated steel screw would rust in the hole.

A 1/4-20 x 5/8 machine screw is a machine thread fastener, so it only works where there is a tapped 1/4-20 hole or a nut behind the joint, which is typical of enclosure covers, strut fittings, and equipment mounting lugs. It will not hold in wood, drywall, or an untapped sheet metal hole. For that you need a self tapping or sheet metal screw instead.

One jar holds 100 screws. Metallics packs this item in a jar rather than a box, which is what service techs and MRO stockrooms want on a van or shelf, since the lid reseals and the screws stay sorted.

They are Phillips drive. A 1/4-20 head of this size normally takes a #2 Phillips bit, and the pan head gives a flat bearing surface, so no countersink prep is needed in the panel.