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Widia spiral flute tap #4-40 bottoming 2 flutes UNJC high speed steel black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5131 Spiral Flute Tap #4-40 Bottoming 2 Flutes UNJC

SKU CH-AXR3-HGX30

Spiral flute tap cuts #4-40 UNJC threads with two flutes and bottoming chamfer in high-speed steel

  • Spiral flute clears chips efficiently in blind holes
  • #4-40 UNJC thread fits precision applications
  • Bottoming chamfer reaches full thread depth
  • Two flutes balance strength and chip space
  • High-speed steel with black oxide resists wear

Thread Cutting Tool for Precision Holes

The Widia Gtd VTSFT-TC5131 is a spiral flute tap designed to cut internal threads in metal components. It suits machinists and maintenance technicians who need accurate #4-40 UNJC threads in through-holes or blind holes.

Critical Specification Is the #4-40 UNJC Thread

This tap cuts a #4-40 UNJC thread with a 3B class of fit and H3 thread limit. The 75 percent thread drill size is 2.20 mm. Using an incorrect drill diameter or thread standard will produce oversize or undersize threads that reject the mating fastener.

Straightforward Installation With Common Pitfalls

The tap features a bottoming chamfer and two flutes made from high speed steel with a black oxide finish. Overall length is 1 7/8 in and thread length is 33/64 in. Apply cutting fluid, maintain alignment, and reverse frequently to clear chips; forcing the tap or running dry often leads to breakage or poor thread quality.

How it compares

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

Price $21.99
Cheaper than about 60% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

What does the #4-40 thread size mean when I use this tap in a machine?

The #4-40 designation indicates a number 4 diameter with 40 threads per inch, producing a UNC thread form to a 3B class of fit with a right-hand thread direction.

How does the UNJC thread standard affect the threads this tap cuts?

UNJC specifies a controlled root radius for higher fatigue strength, and this tap cuts to a 3B class of fit with a 75 percent thread depth based on a 2.20 mm drill size.

What physical dimensions determine whether this tap fits my holder or workpiece?

The tap has an overall length of 1 7/8 in and a thread length of 33/64 in, with two spiral flutes and a black oxide finish on high speed steel.

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