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Widia Gtd spiral flute tap M8x1.25 bottoming 3 flutes 69.1mm high speed steel black oxide finish

Widia Gtd

Widia Gtd VTSFT-TC5556 Spiral Flute Tap M8x1.25 Bottoming 3 Flutes 69.1mm

SKU CH-HY79-8A9Z4

M8 x 1.25 spiral-flute tap with 69.1 mm overall length, 17.5 mm thread length and three flutes for bottoming threads in metric holes

  • M8 x 1.25 metric thread fits standard automotive fasteners
  • Spiral flute design clears chips efficiently in blind holes
  • Bottoming chamfer reaches full thread depth at hole base
  • High-speed steel with black oxide resists wear during repeated use
  • Three flutes balance cutting speed and thread finish quality

Spiral Flute Tap M8x1.25

This Widia Gtd tap cuts internal threads in blind holes. It uses a spiral-flute design to pull chips backward and out of the hole. The thread size is M8 by 1.25 mm pitch. Overall length measures 69.1 mm with a 17.5 mm thread length. It is made from high-speed steel with a black oxide finish.

Blind-hole threading in steel

The three-flute geometry suits machine tapping of through-hardened and stainless steels where chip evacuation matters. Bottoming chamfer lets threads start close to the hole bottom. Buyers who need a taper or plug chamfer for through holes should choose a different tap style. Hand tapping or very soft materials may also suit a straight-flute design better.

Machine-ready shank fits standard holders

The straight shank drops into ER collets, drill chucks or tap holders without adapters. Use the recommended 75 percent thread drill size H for correct engagement. D5 thread limit and 6H class of fit match standard metric specs. California Proposition 65 notice applies; handle with gloves and wash hands after use.

How it compares

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

Price $29.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameWIDIA

Questions about this item

What drill size H is required before tapping with this M8×1.25 spiral flute tap?

A 75-per-cent thread drill size H is specified for this tap, giving the correct hole diameter for an M8×1.25 thread.

Will the 69.1 mm overall length fit in the same tool holder I use for shorter M8 taps?

The tap measures 69.1 mm overall; verify your holder’s maximum tool length to ensure proper engagement and clearance.

How can I confirm the tap is cutting a class 6H thread correctly after setup?

Check the finished thread with an M8×1.25 6H go/no-go gauge; the go member should enter freely and the no-go member should not pass.

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