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Widia Gtd tap set #12-28 UNF H3 high speed steel bright finish

Widia Gtd

Widia Gtd 15393 Tap Set #12-28 UNF H3

SKU CH-85A0-JY1E2

A #12-28 UNF H3 tap set in high-speed steel for cutting fine right-hand threads

  • UNF thread standard fits #12-28 fine-pitch applications
  • High-speed steel construction resists wear during tapping
  • H3 thread limit ensures precise class-of-fit control
  • Four-flute design improves chip evacuation in blind holes
  • Bright uncoated finish suits general-purpose threading tasks

Widia Gtd Tap Set #12-28 UNF

The Widia Gtd 15393 tap set cuts internal UNF threads for a #12-28 thread size. It is made from high speed steel with a bright uncoated finish for general purpose threading tasks. The set includes taps with a thread limit of H3 and a right hand thread direction. Four flutes provide standard chip evacuation during the cutting process.

Machinists cutting fine UNF threads

This set suits machinists and maintenance technicians producing #12-28 UNF threads in materials compatible with high speed steel. The H3 limit targets a specific class of fit for standard applications. It is not intended for users requiring a different thread standard such as metric or NPT, or for those needing a coated tool for high temperature alloys or abrasive materials.

#12-28 UNF thread size with H3 limit

The defining specification is the #12-28 UNF thread size combined with an H3 thread limit. This pairing determines the exact pitch diameter tolerance and the resulting class of fit for the finished hole. Select this set only when the drawing or specification calls for this exact thread size and limit combination.

How it compares

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

Price $18.99
Cheaper than about 66% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameWIDIA

Questions about this item

Which tap thread size from the Widia 15393 set matches my #12-28 UNF requirement?

The set supplies a #12-28 UNF thread size with an H3 limit, right-hand direction and four flutes for that specific fit.

What does the 15/16 inch thread length mean when I am tapping a hole in the workshop?

It gives a 15/16 inch cutting depth on a 2 3/8 inch overall tool, so the tap reaches that far into the workpiece before the shank bottoms out.

How does the UNF standard in this set affect the pitch I will actually cut?

UNF fixes the pitch at 28 threads per inch, so every pass advances the tap by exactly one twenty-eighth of an inch.

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