Metallics JRM116 3/8-16 x 2 in. Round Head Combo Machine Screws - Steel Zinc - Each

The JRM116 3/8-16 x 2 inch round head combo machine screw ships in a jar of 100, and 100 is the order minimum. If you need a different size or a different count, Metallics states other sizes and quantities are available by request.

Either one. The head is a combo recess, slotted and Phillips in the same head, so a crew can drive it with whatever is already on the belt. Phillips side calls for a #4 driver, the slot runs 0.081 to 0.094 in. wide and 0.117 to 0.155 in. deep, so a wide-blade screwdriver seats properly.

It is a 3/8 inch diameter machine screw with 16 threads per inch, which is the standard 3/8 coarse (UNC) thread, so it mates with any 3/8-16 nut or tapped 3/8-16 hole. Usable length is 2 inches under the head, so subtract your material stack to see how much thread lands in the nut.

No. The JRM116 combo machine screw is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic sourcing clause, this part will not satisfy it.

It stands proud. Round head means the screw bears on the surface rather than countersinking, with a head 0.67 to 0.708 in. across and 0.237 to 0.256 in. tall. If you need the head buried flush in the panel, you want a flat head screw instead, not this one.

Rated at 60,000 psi minimum tensile with a hardness of Rockwell B70 to B100, made from AISI 1006-1022 low carbon steel. That is standard commercial-grade machine screw territory, fine for general mounting, strut, box and enclosure work. For structural or high-load bolted joints you want a graded bolt (Grade 5 or Grade 8), not a low carbon machine screw.

These are zinc plated steel, which is an indoor and dry-location finish. Zinc plating gives light corrosion resistance for interior electrical, plumbing, heating and air conditioning work, but it is not stainless. For exterior, damp or washdown areas, specify a stainless machine screw in the same 3/8-16 x 2 size.

The Phillips recess on the JRM116 is dimensioned for a #4 driver: 0.374 to 0.387 in. recess diameter, 0.202 to 0.228 in. deep, with a gaging penetration of 0.182 to 0.208 in. Use a #4 Phillips bit, not a #2 or #3. An undersized bit rides high in that recess and is what chews the head up under a drill.

Screws only. The jar of 100 contains the 3/8-16 x 2 in. round head combo machine screws and nothing else, so order 3/8-16 nuts and any flat or lock washers separately.

The jar comes in at 6.48 lbs, with the packaged jar measuring 7.25 in. by 4.5 in. by 4.5 in. Worth knowing if you are staging multiple jars on a van shelf or building a stock kit.