Metallics 3816CTTE Carbon Steel Tap Taper Type 3/8-16 (1pc)

The Metallics 3816CTTE is a 3/8-16 tap, so it cuts a 3/8 inch coarse thread at 16 threads per inch. That is the standard UNC pitch for 3/8 inch hardware, which is what you want when you are threading a hole for 3/8-16 rod, bolts, or beam clamps.

A taper tap like the 3816CTTE has a long chamfered lead, usually several threads ground back, so it pulls itself into the hole and starts square. That makes it the one to reach for first on through holes and on open steel where you can run the tap all the way out the back. If you are threading a blind hole and need full threads right to the bottom, a taper tap will leave the last few threads incomplete, and you follow it with a bottoming tap.

Carbon steel. The 3816CTTE is a carbon steel tap, which cuts mild steel, aluminum, and sheet metal fine for occasional field work. For production tapping or harder alloys and stainless, electricians and fabricators generally step up to a high speed steel tap, which holds its edge longer at higher speeds.

Yes, chasing existing 3/8-16 threads is a common use for this tap. The taper lead lets it pick up the first threads in a hole that is already cut, so it will clear burrs, paint, and galvanizing out of a 3/8-16 hole before you run a hanger rod or bolt in. Keep in mind it is a carbon steel tap, so take it slow and back it off to clear chips rather than forcing it.

One tap per pack, supplied in a pouch. If you are kitting out multiple vans or a shop drawer, order one per tap holder you need to fill rather than expecting a set.

3816CTTE is the Metallics part number for the 3/8-16 carbon steel taper tap. The number reads straight off the spec: 3816 for the thread size and pitch, CTTE for carbon steel taper type.