Metallics RSB21 10-32 x 2 in. Round Head Combo Stove Bolt Screws with Hex Nut - Steel Zinc - Each

A hex machine screw nut is included with each Metallics RSB21 bolt. It is a nut cut specifically for machine screw threads, so it matches the 10-32 thread without hunting for a separate box of nuts. The bolts ship as a 100-piece clamshell pack, minimum order one jar quantity.

It's a #10 machine screw thread at 32 threads per inch, right hand, cut to ANSI B18.6.3. That is the same 10-32 thread used in most electrical enclosures, device boxes and channel nuts, so it threads straight into an existing 10-32 tapped hole or channel nut.

The RSB21 has a 2 in. shank length, so it will pass through a combined material thickness of a little under 2 in. once you allow for the hex nut and a thread or two of stick-out. Plenty for through-bolting a device or bracket through sheet metal, plywood backing, or a strut channel with spacers.

No. The RSB21 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your federal, state or institutional spec carries a domestic sourcing clause, this part will not satisfy it and you'll need a domestically manufactured fastener.

Either one. The RSB21 head carries a combination slotted and Phillips recess, so a #2 Phillips or a flat blade both drive it. The slot runs 0.05 to 0.06 in. wide and 0.065 to 0.087 in. deep, and the Phillips recess is 0.182 to 0.195 in. across at 0.119 in. deep. Handy when you're up a ladder with whatever is on your belt.

The round head measures 0.334 to 0.359 in. across and 0.123 to 0.137 in. tall. That's roughly twice the #10 shank diameter, so it bridges a slightly enlarged or slotted hole and gives a domed bearing surface instead of a flush countersink. If you need a flush seat in a countersunk hole, a round head is the wrong choice - go with a flat head machine screw.

Zinc plated steel gives moderate corrosion protection - fine for indoor work, damp mechanical rooms, and covered exterior locations. For direct weather exposure, salt air, or wet locations that stay wet, zinc plating will eventually rust and stainless is the better call. The RSB21 is zinc plated steel made from AISI 1006 to 1022 carbon steel.

Minimum tensile strength is 60,000 psi, with a case hardness of Rockwell B70 to B100. That is standard low carbon machine screw grade: good for mounting boxes, brackets, straps and covers, not for structural or high stress connections where a graded bolt is specified.

Metallics lists the RSB21 for electrical, plumbing, heating and air conditioning work. In practice that's hanging boxes and brackets off strut, bolting duct straps and hangers, fastening covers and plates, and any spot where you need a through-bolt with a captive nut rather than a tapped hole.

They come in a clamshell pack of 100 bolts with nuts, and 100 is the minimum order quantity (one jar). Metallics notes the standard package for the stove bolt line is a square plastic jar, and other sizes and quantities are available by request.