Metallics JDS143 14 x 3 in. 3/8 Indented Hex Head Slotted Sharp Point Tapping Screws - Steel Zinc - Each

Type A is the sharp gimlet point tapping screw, meant to be driven into thin metal without a tapped hole. The JDS143 is specified for light metal assembly such as electrical outlets, framing and other sheet metal work. The gimlet point starts on its own in light gauge material; it is not a self-drilling screw, so heavy plate still needs a pilot hole.

Nominal #14 diameter, 3 in. length, 10 threads per inch, with threads to ASME B18.6.4 and head dimensions to ASME B18.6.3-2010. Head height runs 0.172 to 0.19 in. The 3 in. length gives you reach through furring, blocking or stacked sheet metal, but remember Type A threads grip in thin material, so the useful hold comes from the gauge you land in, not the overall length.

Torsional strength is rated at 125 lb-in minimum, with case hardness at Rockwell C28-38 on AISI 1016-1024 steel. That is enough for hand and standard drill driving in light gauge metal. An impact gun at full torque in thick or hard material will exceed 125 lb-in and twist the shank, so back off the clutch setting.

No. The JDS143 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements, you will need a domestically produced fastener instead.

Either works. The head is an indented hex with a slot, so you can run it with a nut driver over the hex or finish it with a flat blade. Head width measures 0.367 to 0.375 in., width across corners 0.409, and the slot is 0.064 to 0.075 wide by 0.083 to 0.101 deep. A 3/8 nut driver or socket is the fast way; the slot is there for tight spots and final snugging.

The JDS143 ships as a 100 piece jar, and the jar is the order minimum. Jar weight is listed at 3.38 lbs. If you need a different size or count, Metallics offers other sizes and quantities by request.

The JDS143 is zinc plated carbon steel, which is an indoor and dry location finish. Zinc gives handling and light humidity protection only. For exterior, wet or corrosive locations, step up to stainless or hot dip galvanized fasteners instead.

Yes, the indented hex head carries an integral washer face measuring 0.480 to 0.520 in. outside diameter and 0.030 to 0.050 in. thick. That bearing surface spreads load on thin sheet and keeps the head from pulling through light gauge metal or dimpling a box face.