Metallics SBHK1420 Bolts 1/4-20 Hx Blt Wshr &Nt Kit SS (Tray 700)

All of it is 18-8 stainless steel, bolts, nuts and both washer styles. That is the austenitic 300-series stainless normally specified for damp interior, outdoor and mildly corrosive locations, so it holds up in mechanical rooms, rooftops and wash-down areas where plated steel rusts out.

Thread is 1/4-20, meaning 20 threads per inch on a 1/4 inch diameter, which is the standard UNC coarse thread used on 1/4 inch strut nuts, beam clamps and equipment enclosures. Anything tapped 1/4-20 takes these. If your channel nuts are 3/8-16, this kit is the wrong size.

No. The SBHK1420 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. For federally funded work carrying domestic-sourcing clauses, you will need a domestically produced 1/4-20 stainless fastener instead.

Metallics lists the SBHK1420 for the electrical, plumbing, heating and air conditioning trades. It is a service-truck or shop tray rather than a job-specific bill of material: one part number covers hanging strut, mounting enclosures, bracket work and equipment anchoring wherever 1/4-20 stainless is called for.

Hex head throughout, both the cap screws and the nuts, so a socket or open-end wrench does the whole job. No drivers or bits needed, and the hex nuts match the same 1/4-20 thread.

One tray is the minimum, sold each. The SBHK1420 ships as a single 700-piece tray, so a shop restocking one truck does not have to take a multi-tray case.

The tray carries 200 of each in 1/4 inch so you can build the normal stack: flat SAE washer against the material to spread load and protect the surface, split lock washer under the nut to resist loosening from vibration. On equipment that vibrates, such as fan or compressor mounts, use both. On a static bracket a flat washer alone is often enough, which is why the counts run ahead of the 150 nuts.