Metallics JTS11 4 x 1 in. Pan Head Combo Sharp Point Tapping Screws - Steel Zinc - Each

Type A tapping screws thread themselves into thin material without a tapped hole. The JTS11 is a Type A screw with a gimlet (sharp) point, so it starts in a pilot hole in sheet metal, light-gauge steel, or non-metallic sheet and forms the thread as it drives. Metallics lists it for electrical, plumbing, and HVAC work, which is the usual sheet-metal box, strap, and bracket duty. For driving straight into hardened or heavy stock, a self-drilling point is the better choice.

No. Metallics lists the JTS11 as not Buy American compliant and not ARRA compliant, with country of origin recorded as multiple. On a federally funded project with domestic sourcing requirements, you will need a domestically produced fastener instead.

It takes a combo recess, so either a #1 Phillips bit or a flat blade works. Metallics calls out a #1 driver size; the Phillips recess measures 0.115 in. diameter and the slot runs 0.031 to 0.039 in. wide and 0.027 to 0.04 in. deep. Being a combination head, a tech with only a flat screwdriver on the truck can still set these.

The head measures 0.205 to 0.219 in. across with a head height of 0.07 to 0.08 in. That is a low-profile pan head, not a countersunk one, so it seats on the surface and does not pull flush into a tapered hole. If your part is drilled and countersunk for a flat head, a pan head will stand proud of the face.

They ship in a jar of 100 as the minimum order quantity, so you are buying a jar rather than loose pieces. Jar weight is listed at 0.28 lbs.

These are carbon steel with a zinc plating, which handles indoor and dry-location work. Zinc plating is a sacrificial coating, not stainless, so in wet, coastal, or chemically aggressive spots it will eventually rust through. For those openings specify a stainless or coated-stainless tapping screw instead.

Head and dimensional geometry follow ASME B18.6.3-2013, and the thread form follows ASME B18.6.4. Steel is to AISI 1016 through 1024 with a case hardness of Rockwell C28 to 38. Note that Metallics states dimensions for #9 diameter screws fall outside ASME B18.6.4; the #4 x 1 in. size is not affected.

Yes, in metal. Type A screws with a gimlet point tap their own thread but do not drill their own hole, so a pilot sized to the #4 shank is needed in sheet steel. In softwood or soft plastics the sharp point will start on its own.

Fastener length is 1 inch measured under the pan head. With a #4 shank that is a long, slender screw, so it suits fastening through thin sheet or a shallow spacer into light-gauge steel rather than heavy structural stock. A #4 body is small diameter; if you need more pullout, step up in diameter rather than length.