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Spiral flute tap, 7/16-20 UNJF, bottoming, 2 flutes, black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5161 Spiral Flute Tap 7/16"-20 UNJF Bottoming 2 Flutes pneumatic accessory

SKU CH-1RC3-Q0KTC

A spiral-flute tap cutting 7/16"-20 UNJF threads with a bottoming chamfer and two flutes

  • Spiral flute clears chips efficiently in blind holes
  • UNJF 7/16"-20 thread fits aerospace fasteners precisely
  • High-speed steel with black oxide resists wear longer
  • Bottoming chamfer cuts full threads to hole bottom
  • Three flutes balance strength and chip evacuation well

Widia Gtd Spiral Flute Tap 7/16"-20 UNJF

The Widia Gtd VTSFT-TC5161 is a high-speed steel spiral flute tap designed for creating internal threads in pneumatic and power tool applications. It suits machinists and maintenance technicians who need reliable thread cutting performance. The black oxide finish enhances wear resistance during operation. This new accessory arrives ready for immediate workshop use.

Thread specification 7/16"-20 UNJF bottoming

The critical specification is the 7/16"-20 UNJF thread size with a bottoming chamfer style. This configuration determines compatibility with the specific threaded hole requirement. The tap features three flutes and a H3 thread limit for a 3B class of fit. Right-hand thread direction matches standard fastening conventions. Select this tap only when the drawing calls for these exact parameters.

High-speed steel construction with black oxide

The high-speed steel substrate provides the hardness and toughness needed for threading ferrous and non-ferrous materials. Black oxide surface treatment reduces galling and improves chip evacuation in the spiral flutes. Overall length measures 3 5/32 inches with a 7/8 inch thread length. The 75 percent thread drill size is 9.95 mm. No additional coatings or accessories are included in the package.

How it compares

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

Price $34.99
Pricier than about 57% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

What does the 7/16"-20 UNJF size mean for the threads I will cut?

It produces a 7/16 inch diameter thread with 20 threads per inch in the unified special series, giving a class 3B fit for precise aerospace-type assemblies.

How does the H3 thread limit affect the tap's performance in a machine?

The H3 limit sets the pitch diameter tolerance for a 3B class of fit, ensuring the internal thread meets tight aerospace specifications when run at proper speeds.

What drill size and clearance do I need to fit this tap in a holder?

Use a 9.95 mm drill for 75 percent thread engagement; the tap's 3 5/32 inch overall length and 7/8 inch thread length require a holder that accommodates that reach.

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