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Widia spiral flute tap, black oxide finish, 2 flutes

Widia Gtd

Widia Gtd VTSFT-TC5162 Spiral Flute Tap 7/16"-20 UNJF Bottoming 2 Flutes pneumatic accessory

SKU CH-P9XX-BGA6N

Spiral-flute tap cuts 7/16"-20 UNJF threads with two flutes for bottoming holes

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

Thread cutting tool for UNJF threads

The Widia Gtd VTSFT-TC5162 is a spiral flute tap designed for creating internal UNJF threads in a 7/16"-20 size. It features a bottoming chamfer and two flutes made from high speed steel with a black oxide finish. This accessory is intended for use with compatible power or pneumatic tool holders in thread cutting applications.

Suited for bottoming operations in specific thread

This tap suits machinists producing UNJF 7/16"-20 threads where a bottoming profile is required. The two flute design and high speed steel construction support general purpose threading tasks. It is not for through-hole applications needing a taper or plug chamfer, nor for thread forms or diameters other than the stated UNJF specification.

Handles 7/16"-20 UNJF threads

The tool comfortably cuts threads with a 75 percent thread engagement using a 9.95 mm drill size. Its thread length is 7/8 in within an overall length of 3 5/32 in. It runs out when a different thread class, limit, or direction is needed, or when the workpiece material exceeds the capability of high speed steel.

How it compares

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

Price $38.99
Pricier than about 61% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

Which tap handle or wrench square size fits the 7/16"-20 UNJF spiral flute tap?

Use a tap wrench sized for a 7/16" tap; the square on the shank matches standard dimensions for that thread size.

Can the 7/16"-20 UNJF tap cut threads in an existing UNF 2B hole without re-drilling?

Yes, the H5 limit and 2B class of fit are compatible with UNF 2B tolerance; verify the hole matches the 9.95 mm drill size first.

How do I confirm the 7/16"-20 UNJF tap produced the correct thread after tapping?

Check the thread with a UNJF 2B go/no-go gauge; the go gauge should pass fully and the no-go gauge should stop within three turns.

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