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Widia Gtd spiral flute tap 1/2"-13 bottoming 2 flutes UNJC high speed steel black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5164 Spiral Flute Tap 1/2"-13 Bottoming 2 Flutes UNJC pneumatic accessory

SKU CH-59G0-ED9M3

Cuts 1/2"-13 UNC threads to bottom in blind holes with three-flute spiral geometry

  • Spiral flute design clears chips efficiently during bottoming taps
  • 1/2"-13 UNJC thread size fits standard coarse-thread applications
  • Two-flute construction balances strength and chip evacuation space
  • High-speed steel with black oxide resists wear and corrosion
  • 15/16 inch thread length ensures full engagement in deep holes

Thread Cutting for UNJC Holes

This spiral flute tap cuts 1/2"-13 UNJC threads in a single pass. The bottoming design allows threading close to the bottom of blind holes. It suits maintenance and production shops that need accurate internal threads in steel or alloy components.

Consistent Chip Evacuation Under Load

Three high-speed steel flutes lift chips upward and out of the hole during continuous tapping. The black oxide finish reduces galling and extends edge life when the tool runs at steady feed rates. Cutting action remains stable through the full thread length without frequent reversal.

Straightforward Setup in Standard Holders

The tap fits conventional tap wrenches or CNC toolholders with a 1/2" shank. A 27/64 inch drill prepares the 75 percent thread hole to the correct depth. Right-hand rotation matches common machine spindles. Builders needing left-hand threads or larger diameters must select a different tool.

How it compares

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

Price $41.99
Pricier than about 62% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

How much heat does the 1/2"-13 tap generate during continuous pneumatic use?

The high-speed steel body with black oxide coating resists heat buildup during extended threading operations.

What drill size must I already own to prepare the hole for this UNJC tap?

A 27/64 inch drill bit is required to create the 75 percent thread engagement before tapping.

Will the H5 thread limit and 2B class of fit match the internal threads on my existing UNC fasteners?

Yes, the H5 limit and 2B fit are standard for unified coarse threads, ensuring compatibility with common 1/2"-13 hardware.

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