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Small silver metal tap with fluted shaft and square shank

Greenfield Threading

Greenfield Threading pneumatic accessory #3-56 UNF plug tap 1.81 in HSS TiN

SKU CH-4QQ0-V0T5E

Straight-flute plug tap cuts #3-56 UNF threads in 1.81 in high-speed steel with TiN coating

  • Precise UNF #3-56 threads for fine fastening
  • Plug chamfer starts threads easily in through-holes
  • 81 in overall length reaches deep holes
  • High-speed steel with TiN coating resists wear
  • Right-hand cut matches standard thread direction

Thread size and material

The Greenfield Threading accessory is a CHICAGO-LATROBE straight flute hand tap designed for creating internal threads. It features a #3-56 UNF thread size and is constructed from high speed steel with a TiN coating. The plug style tap has an overall length of 1.81 in and a thread length of .5 in. It is intended for right hand threading applications.

Drill size and thread class

Before use, verify that the workpiece is drilled to the 75 percent thread drill size #46 to match this tap. The thread limit is H2 with a class of fit 2B, so ensure these specifications align with the required tolerance for the fastener. Confirm the material being tapped is compatible with high speed steel tooling. The tap requires a compatible handle or wrench for manual operation.

Coating benefits and operation

The TiN coating on the high speed steel body helps reduce friction and heat generation during the tapping process. This can extend tool life and improve thread finish compared to uncoated taps. The straight flute design with three flutes manages chip evacuation in through holes. Normal use involves steady manual pressure to maintain thread alignment and prevent tap breakage.

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 comes in the box with the CHICAGO-LATROBE 339047 tap and do I need a separate drill bit?

The box contains the straight-flute plug tap itself. A number 46 drill bit for the 75 percent thread depth is not included and must be purchased separately.

How do I choose between the available versions of this #3-56 UNF tap?

This model is a single H2-limit plug tap with a 1.81 inch overall length and 0.5 inch thread length; no alternative versions or capacities are offered for this part number.

What does the 1.81 inch overall length mean when I use the tap in a real job?

The 1.81 inch length gives the reach needed for through-holes or deep blind holes while the 0.5 inch thread length cuts the full #3-56 UNF profile in a single pass.

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