Metallics JTSS28 10 x 1 in. Pan Head Square Drive Tapping Screws - Steel Zinc - Each

A #2 square (Robertson) bit. The recess on the JTSS28 is specified as driver size 2R, with 0.112 in. across the flats and a gaging depth of 0.060 to 0.075 in. Anything smaller than a #2 square will cam out; a #1 or #3 bit won't seat correctly in that recess.

The JTSS28 is a Type A tapping screw with a gimlet point, so it starts in thin sheet metal and forms its own thread as it drives. Type A is a coarse thread (12 threads per inch at #10) intended for light-gauge sheet metal, not for heavy plate or structural steel. For thicker stock you want a drilled pilot hole or a self-drilling screw instead.

No. The JTSS28 screws are flagged not Buy American compliant and not ARRA compliant, with multiple countries of origin. For a project with domestic-sourcing requirements you'll need a documented domestic fastener instead.

They ship in a jar of 100, and 100 is the order minimum. The jar weighs 0.76 lbs.

A pan head sits on top of the material, it does not countersink. On the #10 JTSS28 the head measures 0.357 to 0.373 in. across and stands 0.122 to 0.133 in. proud of the surface. If you need the head buried, use a flat head screw in a countersunk hole instead.

The JTSS28 is carbon steel with a zinc finish, which handles indoor and dry or lightly damp conditions. Zinc plating is not a marine or sustained-wet coating, so for exterior exposure, coastal air, or wet process areas choose a stainless or hot-dip galvanized fastener.

Yes. Head and recess dimensions follow ASME B18.6.3-2013, the thread conforms to ASME B18.6.4, and the steel is AISI 1016 to 1024. Hardness is Rockwell C28-38 with a 48 lb-in minimum torsional strength, which is what you cite if a spec calls out drive torque capability.

Metallics lists the JTSS28 for electrical, plumbing, heating and air conditioning work. In practice that means mounting straps, hangers, boxes, and plates to light-gauge metal, and duct and sheet metal assembly. The square recess is the reason they are popular overhead: the bit holds the screw on the driver without a magnet.

The JTSS28 is 1 in. long overall measured from under the pan head, since pan heads sit above the material, so essentially the full inch is thread engagement into your substrate. Metallics builds the JTSS series in other diameters and lengths, so if you need more or less reach, the same pan head square drive Type A screw is available in other sizes by request.