Greenfield Threading
Greenfield Threading 339046 Straight Flute Hand Tap Taper 3 Flutes #3-56 UNF HSS TiN
A straight-flute hand tap cuts #3-56 UNF threads in a 1.81 in high-speed steel body with TiN coating and three flutes
- Taper start eases thread engagement
- #3-56 UNF thread size for precise fit
- 3 flutes improve chip clearance
- TiN coating extends cutting life
- High-speed steel withstands heavy use
Straight Flute Tap for Fine Threading
The Greenfield Threading 339046 is a straight flute hand tap designed to cut #3-56 UNF threads. It suits mechanics and hobbyists who need to create internal threads in metal components using hand tools rather than machine tapping. The taper chamfer helps start threads squarely in through-holes or deep blind holes where alignment matters.
TiN Coating and Drill Size Guide
A titanium nitride coating increases surface hardness and reduces friction, which extends tool life when cutting steel or stainless alloys. The specification includes a 75 percent thread drill size of #46, giving the user a direct reference for the correct tap drill without consulting separate charts. The H2 thread limit produces a class 2B fit for standard assembly tolerances.
Material and Length Constraints
High speed steel construction limits use to materials softer than the tap itself; hardened steels or abrasive alloys will dull the flutes quickly. The overall length of 1.81 inches and thread length of .5 inch restrict reach in deep or recessed holes, so the tap cannot thread full depth in thick workpieces without an extension. Right-hand cutting direction means it cannot be used for left-hand thread applications.
Highlights
- Taper start eases thread engagement
- #3-56 UNF thread size for precise fit
- 3 flutes improve chip clearance
- TiN coating extends cutting life
- High-speed steel withstands heavy use
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How often will the TiN coating on this #3-56 UNF tap need replacement?
The TiN coating on the high-speed steel tap wears gradually; replace the tap when thread quality drops or the 0.5 in thread length no longer cuts cleanly.
What limit appears first during sustained threading with the H2 class-of-fit tap?
The H2 thread limit and 75 percent thread depth with a #46 drill size define the fit; sustained use will first show wear on the 3-flute cutting edges.
How much heat builds up in the 1.81 in overall length tap during all-day hand tapping?
Hand operation at low speed keeps heat low; the TiN coating reduces friction on the 3 flutes, so the tap stays cool enough for continuous use.
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