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Bright steel straight-flute hand tap, plug style, three flutes

Greenfield Threading

Greenfield Threading 313507 pneumatic accessory

SKU CH-CVR7-341SP

A straight-flute hand tap cuts UNF threads in 7/16 in. -20 size using high-speed steel with three flutes and a bright finish

  • Plug tap starts threads easily in through-holes
  • Three flutes clear chips efficiently during hand tapping
  • High-speed steel resists wear on repeated use
  • Bright finish prevents coating flaking in blind holes
  • UNF 7/16-20 thread fits standard fine-pitch fasteners

Greenfield Threading 313507 hand tap

The Greenfield Threading 313507 is a spiral point hand tap designed for creating internal threads in metal workpieces. It features a 7/16 inch -20 UNF thread size and a 3 5/32 inch overall length. The tool is made from high speed steel with a bright uncoated finish and uses a right-hand thread direction.

Machinists cutting UNF threads in through-holes

This tap suits machinists and maintenance technicians cutting 7/16 inch -20 UNF threads in through-hole applications where chip evacuation ahead of the tool is preferred. The H11 thread limit and Class 1B fit target standard production tolerances. It is not intended for blind holes where chips must be pulled upward or for users needing a coated tool for extended life in abrasive alloys.

Straightforward use with standard tap wrenches

Installation requires a compatible tap wrench or handle matched to the tap shank; the square drive engages the wrench for manual rotation. The 1 7/16 inch thread length and 75 percent thread drill size of 9.95 mm guide the drilling operation. Common issues include tap breakage from misalignment, insufficient lubrication, or forcing the tool without clearing chips in deep holes.

How it compares

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

Price $11.99
Cheaper than about 84% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What size tap wrench or handle fits the 7/16 In. -20 UNF straight-flute hand tap?

Use a tap wrench sized for a 7/16 inch UNF thread; the tap has a 3 5/32 inch overall length and a 1 7/16 inch thread length with three flutes.

Can this H11 class-of-fit tap cut threads in a hole drilled with a 9.95 mm bit for 75 percent thread engagement?

Yes, the 75 percent thread drill size is 9.95 mm and the thread limit is H11 for a class-of-fit 1B result.

How do I verify the new tap produces a correct 7/16 -20 UNF internal thread after tapping?

Check the finished hole with a 7/16 -20 UNF thread plug gauge; the tap cuts right-hand threads with a bright uncoated high-speed steel finish.

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