Metallics JTSF7 6 x 3/8 in. Flat Head Phillips Tapping Screws - Steel Zinc - Each

The JTSF7 is a Type A tapping screw with a gimlet point, so it forms its own thread as it drives into sheet metal, and thin stock often takes it straight through a punched or drilled clearance hole. The point is not a drill point, so you still need a hole in heavier gauge material. Thread count is 18 per inch on a #6 diameter.

Yes, if the countersink is cut for a standard #6 flat head. The JTSF7 head measures 0.238 to 0.262 in. across with a head height of 0.069 to 0.083 in., so it sinks flush or slightly below the surface in a matching 82 degree countersink. In an uncountersunk hole a flat head will stand proud and rock; use a pan head there instead.

Torsional strength on the #6 JTSF7 is 24 lb-in minimum, which is low for an impact driver. Drive them with a clutched screwgun or drill set on a low torque setting. The case hardness of Rockwell C28-38 lets the gimlet point form thread in sheet metal, but a #6 body snaps before it stalls an impact tool.

At 3/8 in. under the head, the JTSF7 is a short screw meant for sheet metal, device plates, box covers, brackets, and light panel work where the material stack is thin. Because it is a flat head, the 3/8 in. is measured overall including the head, so usable thread below a countersunk surface is less than that. Anything with real thickness behind it needs a longer screw.

A #2 Phillips bit. The JTSF7 has a Phillips drive with a recess 0.168 in. across and 0.094 in. deep, so a #2 tip seats fully without camming out. Keep the driver square to the work; the recess width is only 0.029 in.

Yes. The JTSF7 is built to ASME B18.6.4-1998 for dimensions and ASME B18.6.4 for the thread form, so head and thread geometry matches any other B18.6.4 #6 Type A screw. Steel is AISI 1016-1024 and case hardness runs Rockwell C28-38.

The JTSF7 is zinc plated steel, which is an indoor and dry location finish. It handles condensation and handling, but sustained wet exposure, coastal air, or direct weather will rust it. For exterior or wash-down work pick a stainless screw instead.

The JTSF7 is flagged Buy American compliant and ARRA compliant, which is what procurement asks for on federally funded work. Country of origin is listed as multiple, so if your spec requires a single named origin on the submittal, that is worth confirming on the lot you receive.

They ship in a jar of 100, and 100 count is the order minimum. Figure roughly 0.18 lbs per jar, so they are easy to keep a few of on the truck or in the shop drawer.