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Widia Gtd spiral flute tap 1/4-18 cobalt black oxide 4 flutes

Widia Gtd

Widia Gtd VTSFT8504 Spiral Flute Tap 1/4-18 pneumatic accessory

SKU CH-9NZB-CK77T

Spiral flute tap cuts 1/4-18 NPT/NPTF threads in cobalt steel with four flutes and black oxide coating

  • Spiral flute clears chips efficiently
  • 1/4"-18 NPT/NPTF thread size fits standard pipe threads
  • Cobalt construction with black oxide resists wear
  • Four flutes provide smooth cutting action
  • Bottoming design threads close to hole bottom

Widia Gtd VTSFT8504 Spiral Flute Tap

The Widia Gtd VTSFT8504 is a spiral flute tap built for cutting internal threads in pipe fittings and hydraulic components. It suits maintenance technicians and metalworking shops that require reliable NPT and NPTF thread forms in steel or stainless steel.

Cobalt substrate with black oxide finish

The cobalt construction resists wear during repeated tapping operations while the black oxide coating reduces friction and improves chip evacuation. Four flutes and a bottoming chamfer allow threading close to the bottom of blind holes without binding.

Ideal for pipe-thread repair

This tap fits workflows that demand accurate 1/4"-18 threads in tough materials. Buyers who need high-speed production tapping or specialised coatings for exotic alloys should evaluate dedicated alternatives.

How it compares

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

Price $36.99
Pricier than about 59% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

Will the cobalt spiral-flute tap need re-sharpening or replacement after threading multiple 1/4"-18 NPTF holes?

Cobalt construction resists wear longer than standard high-speed steel, so the four-flute tap stays sharp through many bottoming cuts before re-grinding is required.

What limits continuous tapping cycles with this 1/4"-18 bottoming tap?

Chip evacuation in deep blind holes is the first constraint; the spiral-flute design lifts swarf, but very long runs may still need peck cycles to prevent packing.

How much heat builds up in the tap during all-day 1/4"-18 NPTF production?

Cobalt handles higher cutting temperatures than HSS, and the black-oxide finish reduces friction, keeping the tool cool enough for extended shifts without coolant flood.

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