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Widia spiral flute tap 5/16-24 UNJF bottoming two flutes high speed steel

Widia Gtd

Widia Gtd VTSFT-TC5153 Spiral Flute Tap 5/16-24 Bottoming 2 Flutes UNJF pneumatic accessory

SKU CH-7EYV-ENZA6

A spiral-flute tap cuts UNJF 5/16-24 threads with two flutes in a bottoming configuration

  • Bottoming chamfer starts threads in blind holes
  • Spiral flute clears chips from deep cuts
  • Two flutes balance strength and chip flow
  • High-speed steel resists wear in steel alloys
  • UNJF 5/16-24 fits aerospace thread specs

Spiral Flute Tap 5/16-24 UNJF

This spiral flute tap cuts 5/16-24 UNJF threads with a bottoming chamfer and two flutes. It is designed for machinists and maintenance technicians producing internal threads in through or blind holes. The high-speed steel construction suits general-purpose threading in steel and non-ferrous materials. The right-hand thread direction matches standard fastener requirements.

Thread dimensions and drill size

The tap has an overall length of 2 23/32 inches and a thread length of 11/16 inches. It follows a Class 3B fit with an H5 thread limit for precise tolerance control. The specified 75 percent thread drill size is I, giving the correct hole diameter for full thread engagement. The tool reaches its limit when hole depth exceeds the thread length or when material hardness requires a coated alternative.

California Proposition 65 notice

This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. The warning informs buyers of regulatory obligations before purchase and use. No accessories or software are bundled with this cutting tool. The notice does not change the tap’s mechanical function or application range.

How it compares

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

Price $22.99
Cheaper than about 58% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

Will the 5/16"-24 UNJF spiral flute tap with a 2 23/32" overall length fit in my existing tap holder?

The tap has a 2 23/32 inch overall length and standard UNJF thread form. Check your holder's capacity against these dimensions to confirm fit.

How can I verify the H5 thread limit and 3B class of fit are cutting correctly after setup?

Run a test thread in the 75% thread drill size I material, then gauge the resulting thread with a 3B class go/no-go gauge to confirm the H5 limit is met.

Does the package include the 75% thread drill size I drill bit or only the 2-flute high-speed steel tap?

The box contains the Widia VTSFT-TC5153 spiral flute tap only. The 75% thread drill size I drill bit must be purchased separately.

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