Metallics JTSF29 10 x 1-1/4 in. Flat Head Phillips Tapping Screws - Steel Zinc - Each

Yes, provided the hole is countersunk. The JTSF29 is a flat head, 0.333 to 0.362 in. across the head and 0.098 to 0.116 in. high, so it draws down into a matching 82-degree countersink and finishes flush. In a plain punched hole with no countersink the head will stand proud by roughly its full height.

No tapping required. Type A is a self-tapping thread with a gimlet point, so the screw forms its own thread in a pilot hole in sheet metal. You still drill a pilot sized to the screw's root, not to the 0.313 in. gaging diameter. With 12 threads per inch, the coarse pitch is what gives it bite in thin gauge material.

No. The JTSF29 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. On federally funded work with domestic sourcing requirements you will need a domestically produced fastener instead.

A #2 Phillips bit. The JTSF29 uses a Phillips drive with a recess 0.198 in. across, 0.124 in. deep and 0.032 in. wide, so a #2 seats fully and reduces cam-out when you are driving into sheet metal overhead.

The JTSF29 is case hardened to Rockwell C28-38 and rated to 48 lb-in minimum torsional strength, made from AISI 1016-1024 steel. That is the standard hardness band for self-tapping screws into light gauge steel. Drive it with a clutch set low rather than an impact driver if you want to stay inside that torque figure.

The JTSF29 is zinc plated carbon steel. Zinc plating is an indoor and dry-location finish, fine for panel work, device boxes, strut and duct inside a building. For exterior, wet locations or coastal exposure, specify a stainless or hot dip galvanized fastener instead, since plated zinc will eventually rust through in standing moisture.

Yes. The JTSF29 is built to ASME B18.6.4-1998 for dimensions and ASME B18.6.4 for the thread form, which is the tapping screw standard a submittal would call out. One caveat worth knowing across the JTSF series: dimensions for #9 diameter screws fall outside ASME B18.6.4. The #10 size is covered.

They come in a jar, 100 screws minimum. So the order unit is the jar, not the individual screw. Jar weight is 0.75 lbs.

Metallics builds the JTSF line for the electrical, plumbing, heating and air conditioning trades. Typical use is fastening straps, brackets, plates and light hardware to sheet metal enclosures, duct and channel where a flush countersunk head is wanted. The 1-1/4 in. length gives enough thread engagement to go through a bracket and still bite the base material.