Widia Gtd VTSFT-TC5163 Spiral Flute Tap 1/2"-13 Bottoming 2 Flutes UNJC pneumatic accessory

Thread-cutting tap for UNC 1/2"-13 holes

This spiral-flute tap cuts unified coarse threads in a 1/2 inch diameter with 13 threads per inch. It is made from high-speed steel with a black-oxide finish. The tool suits maintenance technicians and machinists who need to create internal threads in through-holes or blind holes. The right-hand thread direction matches standard fastener conventions.

Bottoming chamfer limits full-thread depth

The bottoming style has a short lead of only a few threads, so it cannot start a thread from the top of a deep blind hole. A taper or plug tap must begin the cut before this tool finishes to the bottom. The 75 percent thread drill size of 27/64 inch and H3 thread limit define the hole preparation required for a class 3B fit. The 15/16 inch thread length sets the maximum full-form engagement.

Three-flute geometry eases chip evacuation in most

The three flutes provide more chip space than two-flute designs, reducing the chance of binding when tapping steel or cast iron. Use a tapping fluid and keep the tap aligned with the hole axis to avoid breakage. The most common fault is drilling the hole too small or too large, which either overloads the tap or produces an undersize thread. California Proposition 65 warns that the product contains a chemical known to cause birth defects or other reproductive harm.