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Widia Gtd spiral flute tap #8-32 black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5140 Spiral Flute Tap #8-32

SKU CH-HKAK-TN37F

Creates #8-32 UNC threads with a spiral flute design for efficient chip removal

  • Spiral flute design clears chips efficiently in blind holes
  • #8-32 UNC thread size fits standard fasteners
  • High-speed steel with black oxide resists wear and corrosion
  • Three flutes provide smooth cutting action and thread accuracy
  • H3 thread limit meets Class 3B fit requirements

Thread Size and Standard

The Widia Gtd VTSFT-TC5140 is a spiral flute tap designed for cutting UNJC #8-32 threads. It suits machinists and maintenance teams producing high-strength internal threads in through-hole or blind-hole applications. The H3 thread limit and 3B class of fit deliver precise tolerance control for aerospace and automotive components.

Flute Geometry and Coating

Three spiral flutes pull chips upward and out of the hole, reducing packing and torque spikes during bottoming operations. High-speed steel construction with a black oxide finish resists galling and extends tool life in ferrous alloys. The 75 percent thread drill size of 3.40 mm ensures optimal engagement depth for the specified thread form.

Installation Guidance

Right-hand thread direction matches standard toolholder rotation, so no spindle reversal is needed. Use the recommended 3.40 mm drill to avoid oversize holes that weaken the thread profile. Bottoming taps require careful alignment; start the tap square to the workpiece to prevent cross-threading and premature flute wear.

How it compares

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

Price $19.99
Cheaper than about 64% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

Will the three flutes on this #8-32 tap need resharpening or replacement after heavy production runs?

The high-speed steel body with black oxide coating is designed for repeated use; resharpen the three flutes when thread quality drops, otherwise no scheduled replacement is required.

What limit appears first when tapping #8-32 holes continuously in stainless steel?

The H3 thread limit and 3B class of fit define the tolerance envelope; exceeding recommended cutting speeds will cause flank wear before the limit itself is reached.

How much heat and cutting force build-up should I expect when running this tap all day in a CNC cycle?

Expect moderate heat at the 3.40 mm drill size; use flood coolant and the spiral flute geometry to evacuate chips, keeping torque and temperature stable during extended cycles.

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