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Greenfield Threading 313564 straight flute hand tap, silver metal, 1/2"-20 UNF plug style

Greenfield Threading

Greenfield Threading 313564 Straight Flute Hand Tap 1/2"-20 Plug UNF 3

SKU CH-302Y-VCK7D

Straight flute hand tap cuts 1/2"-20 UNF threads in a 11.40 mm hole with three flutes

  • Straight-flute design cuts clean threads in through-holes
  • 1/2"-20 UNF plug tap fits standard fine-pitch fasteners
  • High-speed steel with black-oxide finish resists wear
  • Three flutes evacuate chips for smoother cutting
  • H11 thread limit produces Class 1B fit tolerance

Greenfield Threading 313564 Hand Tap

The Greenfield Threading 313564 is a straight-flute hand tap designed to cut internal UNF threads in a 1/2"-20 size. Made from high-speed steel with a black oxide finish, it features three flutes and a plug chamfer for general-purpose threading. The thread limit is H11 with a Class of Fit 1B.

Machinists Cutting Standard UNF Threads

This tap suits machinists and maintenance technicians who need to create or repair 1/2"-20 UNF threads by hand or with a tapping head. The spiral point design pushes chips ahead of the cut in through-holes. It is not for blind holes where chips must be lifted out, nor for metric or coarse-thread applications.

Requires 11.40 mm Drill and Tap Wrench

A 75 percent thread drill size of 11.40 mm must be used before tapping to achieve correct engagement. The 3 3/8 inch overall length and 1 5/8 inch thread length fit standard tap wrenches and holders. Right-hand cutting direction matches conventional threading operations.

Highlights

  • Straight-flute design cuts clean threads in through-holes
  • 1/2"-20 UNF plug tap fits standard fine-pitch fasteners
  • High-speed steel with black-oxide finish resists wear
  • Three flutes evacuate chips for smoother cutting
  • H11 thread limit produces Class 1B fit tolerance

Specifications

BrandGREENFIELD THREADING

Questions about this item

What size drill bit do I need before tapping with this 1/2"-20 UNF tap?

Use an 11.40 mm drill to create the 75 percent thread hole before starting the tap.

Will the H11 thread limit on this tap still produce a class 1B fit in a hole cut to the 11.40 mm drill size?

Yes, the H11 limit is matched to the 75 percent thread drill so the finished threads meet class 1B.

How can I confirm the tap is cutting correctly after the first few turns?

The straight-flute design should produce clean, continuous chips and advance smoothly at the 1/2"-20 pitch without binding.

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