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Spiral flute tap, 3/4-16 UNJC, bottoming, two flutes, black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5154 Spiral Flute Tap 3/4"-16 Bottoming 2 Flutes UNJC pneumatic accessory

SKU CH-NC1X-3DQGX

A 3/4"-16 UNJC spiral-flute bottoming tap with two flutes for threading pneumatic components

  • Spiral flute clears chips efficiently in blind holes
  • 3/4"-16 UNJC thread size fits aerospace fasteners
  • Bottoming chamfer cuts full threads to hole bottom
  • Two-flute design balances strength and chip space
  • High-speed steel with black oxide resists wear

Spiral Flute Tap 3/4"-16 UNJC

This spiral flute tap cuts 3/4"-16 UNJC threads in a single pass. The bottoming design reaches full thread depth in blind holes. Two flutes evacuate chips efficiently during pneumatic tapping operations. Machinists working with aerospace-grade fasteners will find the UNJC profile matches their required thread form.

High Speed Steel Construction Heat Resistance

High speed steel body withstands the heat generated by continuous pneumatic tapping. Black oxide coating reduces friction and resists galling on stainless and alloy steels. The 15-degree spiral angle pulls chips clear of the cut zone. Operators can maintain consistent feed rates without frequent tool changes.

H5 Thread Limit Class 2B Fit

H5 thread limit produces a Class 2B fit for reliable assembly of critical joints. The 75 percent thread drill size of 5/16 inch prepares holes for optimal thread engagement. Right-hand thread direction matches standard fastener orientation. Users who need left-hand threads or different fit classes must select an alternative tap.

How it compares

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

Price $23.99
Cheaper than about 57% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

How do I install the 3/4"-16 UNJC spiral flute tap and what step is often missed?

Clamp the workpiece securely, select the 5/16" drill for 75 percent thread depth, drill to the required depth, then start the tap straight using a tapping guide or CNC cycle; the step most often missed is applying cutting fluid before every entry to prevent chip welding in the 2-flute design.

What maintenance or replacement will the VTSFT-TC5154 tap need over time?

Inspect the high-speed steel cutting edges after each batch; resharpen or replace the tap once flank wear reaches the H5 thread limit or if the black oxide coating shows breakthrough, as worn flutes produce oversize 2B-class threads.

What limit appears first during sustained threading with this bottoming tap?

Chip evacuation in blind holes becomes the limiting factor; the 2-flute spiral geometry packs chips quickly at the bottom of the 3/4" thread length, so torque spikes and thread quality loss signal the practical production limit.

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