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Small gold-coloured metal tap with three straight flutes, 1.75 in long, marked 300278

Greenfield Threading

Greenfield Threading 300278 Straight Flute Hand Tap #2-56 UNC Taper 3 Flutes 1.75 in HSS TiN

SKU CH-GSW6-6RBPS

A #2-56 UNC straight flute hand tap in high-speed steel with TiN coating, taper style and three flutes for starting threads in through holes

  • Taper design starts threads easily in #2-56 UNC holes
  • Three straight flutes clear chips efficiently during hand tapping
  • High-speed steel body resists wear for longer tool life
  • Titanium nitride coating reduces friction and extends cutting performance
  • 75 in overall length with .44 in thread depth reaches deeper holes

Greenfield Threading 300278 Tap #2-56 UNC

This straight-flute hand tap cuts internal threads in a #2-56 UNC size with a taper lead. Made from high-speed steel with a TiN coating, it measures 1.75 in overall length and has a 0.44 in thread length. The H2 thread limit produces a class 2B fit for general-purpose threading work.

Suits manual tapping in through-holes.

The taper chamfer helps start threads easily in through-holes or at the start of a blind hole. Three flutes provide good chip clearance in ductile materials. Buyers needing to thread to the bottom of a blind hole should choose a bottoming or plug chamfer instead.

Thread size #2-56 UNC with H2 limit

The decisive specification is the #2-56 UNC thread size combined with an H2 thread limit for a class 2B fit. A 75 percent thread drill size of 1.73 mm is required to prepare the hole correctly before tapping.

How it compares

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

Price $9.99
Cheaper than about 88% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What size drill bit do I need to prepare a hole for this #2-56 UNC tap?

Use a 1.73 mm drill bit to achieve the recommended 75 percent thread engagement for this tap.

Will this taper tap start threads in a workpiece already partially threaded with a bottoming tap?

Its taper lead is designed for starting new threads; it may not engage cleanly in an existing thread form cut by a bottoming tap.

How can I verify the tap is cutting to the correct 2B class of fit after setup?

Gauge the finished threads with a #2-56 UNC 2B thread plug gauge; the go member should enter freely and the no-go member should not.

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