Greenfield Threading
Greenfield Threading 300278 Straight Flute Hand Tap #2-56 UNC Taper 3 Flutes 1.75 in HSS TiN
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.
Highlights
- 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
Specifications
| Brand | CHICAGO-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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