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Straight flute hand tap, uncoated bright steel, four flutes, plug chamfer

Helicoil

Helicoil 8193-12 Straight Flute Hand Tap 3/4"-16 Plug Uncoated 4 Flutes hand tool

SKU CH-ZEFC-2GXJA

Straight-flute hand tap cuts 3/4"-16 UNF threads in a 2-inch thread length with four flutes and an uncoated high-speed steel finish

  • Product typeHole, Drill, Bore & Wire Gauges
  • Creates precise UNF threads with 3/4"-16 plug tap
  • Four-flute design clears chips efficiently in through holes
  • High-speed steel construction resists wear during hand tapping
  • Bright uncoated finish suits general-purpose threading tasks
  • H3 thread limit ensures accurate fit for STI inserts

Thread Repair Tap for 3/4"-16 UNF

This Helicoil 8193-12 straight flute hand tap creates internal threads for screw thread inserts in a 3/4 inch minus 16 UNF size. It is made from high speed steel with a bright uncoated finish. The tool features a right hand thread direction and a plug chamfer for starting threads in through holes. It suits mechanics and machinists performing thread repair work.

Four Flute Geometry and H3 Limit

The four flute design provides improved chip evacuation and greater thread accuracy compared to fewer flutes. An H3 thread limit ensures the correct pitch diameter for the resulting insert fit. A thread length of two inches and an overall length of four and fifteen thirty seconds inches allow access to deeper holes. These specifications determine the tap's suitability for specific repair requirements.

Plug Chamfer for Through Hole Starting

The plug chamfer is the critical specification that decides if this tap matches the hole type. It is intended for through holes or blind holes with sufficient clearance at the bottom. It is not for bottoming operations where a full thread is required to the base of a blind hole. Buyers needing a taper or bottoming chamfer must select a different tap.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $59.99
Pricier than about 77% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameHelicoil
Product typeHole, Drill, Bore & Wire Gauges

Questions about this item

When will the 4-flute high-speed steel tap need replacement?

Replace the tap when the cutting edges dull or chip, which occurs after repeated threading of UNF 3/4"-16 holes in steel or aluminum.

What limit appears first during sustained tapping?

The H3 thread-limit tolerance is reached when accumulated wear allows the internal threads to exceed the class 2B fit.

How much heat builds up when running the tap all day?

Heat rises with cutting speed and lack of lubricant; use cutting oil and moderate RPM to keep the high-speed steel body from overheating.

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