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Spiral flute tap, #6-32 UNJC, high-speed steel, black oxide finish, two flutes, bottoming chamfer

Widia Gtd

Widia Gtd VTSFT-TC5135 Spiral Flute Tap #6-32 Bottoming 2 Flutes UNJC pneumatic accessory

SKU CH-NNKJ-P3D47

Spiral flute tap cuts #6-32 UNC threads in blind holes with two flutes and H3 limit

  • Spiral flute design clears chips efficiently in blind holes
  • #6-32 UNC thread size fits standard fastener applications
  • High-speed steel construction with black oxide resists wear
  • Bottoming chamfer cuts threads close to hole bottom
  • Two flutes balance strength and chip evacuation capacity

Spiral Flute Tap #6-32 UNJC

The Widia Gtd VTSFT-TC5135 is a high-speed steel spiral flute tap designed for creating unified fine threads in blind holes. Its bottoming chamfer and black oxide finish suit general-purpose threading tasks in maintenance and light production environments. ||

Thread Size #6-32 UNJC Suitability

This tap suits machinists and technicians cutting internal #6-32 UNJC threads to a 3B class of fit with a #36 drill size. It is not for through-hole applications needing a plug chamfer, larger thread diameters, left-hand threads, or flute counts other than two. ||

H3 Thread Limit Precision

The H3 thread limit defines the pitch diameter tolerance for the 3B class of fit, making it the critical specification for verifying compatibility with the required gauge inspection. A different limit would produce threads that fail go/no-go checks.

How it compares

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

Price $16.99
Cheaper than about 70% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

How do I install the #6-32 UNJC spiral flute tap correctly, and what step is most often missed?

Use a #36 drill for the 75 percent thread depth, then run the tap to the 3/8 in thread length; the step most often missed is checking the H3 limit matches the 3B class of fit before starting.

What maintenance or replacement will this high-speed steel tap need later?

The black oxide coating resists wear, but the cutting edges will dull after repeated use; replace the tap when thread quality drops or the H3 limit no longer holds the 3B fit.

What limit appears first during sustained tapping with this 2-flute bottoming tap?

Chip evacuation in deep or blind holes is the first limit; the 2-flute design and 1 63/64 in overall length reduce clearance, so clear chips frequently to avoid binding.

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