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Widia spiral flute tap, 7/16 inch, black oxide finish, three flutes

Widia Gtd

Widia Gtd VTSFT-TC5159 Spiral Flute Tap 7/16 in-14 Bottoming 2 Flutes UNC pneumatic accessory

SKU CH-A3PJ-X39K4

A 7/16 in-14 UNC bottoming tap with three flutes cuts internal threads in blind holes

  • Spiral-flute design clears chips efficiently in blind holes
  • Bottoming chamfer cuts threads close to the hole bottom
  • High-speed steel with black-oxide coating resists wear
  • UNC 7/16 in-14 thread fits standard coarse applications
  • Three flutes balance strength and chip evacuation

Widia Gtd Spiral Flute Tap 7/16 UNC

This Widia Gtd spiral flute tap cuts 7/16 in-14 UNC threads in a bottoming style. It is made from high speed steel with a black oxide finish. The tool has three flutes and a right-hand thread direction. It suits professional machinists and maintenance technicians needing accurate internal threads.

Installation and common issues

The tap requires a 75 percent thread drill size U for proper engagement. Using an incorrect drill size often leads to oversize or undersize threads. Chip evacuation works best with spiral flute geometry in blind holes. Applying suitable cutting fluid reduces torque and extends tool life during operation.

Suitable users and limitations

This tap suits users cutting UNC threads to a 3B class of fit in materials compatible with high speed steel. It is not for buyers who need a different thread standard or pitch. It is not for builders who require a taper or plug chamfer style. It is not for operators needing carbide tooling for high-volume production.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $35.99
Pricier than about 58% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

How can I confirm the tap is cutting a correct 7/16 in-14 UNC thread after setup?

Check the thread with a 3B Class of Fit gauge; the H3 limit and right-hand direction should match the gauge reading for a proper fit.

What comes in the box and what must I supply separately?

The box contains the WIDIA VTSFT-TC5159 spiral flute tap only; you must provide a compatible drill bit for the 75 percent thread drill size U and a tap holder or wrench.

Which version of this tap should I choose for a standard UNC 7/16 in-14 hole?

Select the VTSFT-TC5159 model with H3 thread limit, 3B class of fit, 3 flutes and black oxide finish as listed for UNC 7/16 in-14 threading.

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