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Silver steel tap with fluted shaft and square drive end, 5/16 inch size marking visible

Drill America

Drill America 5/16"-56 HSS Plug Hand Tap

SKU CH-B2QV-GW4DB

Cuts 5/16"-56 threads in through holes using high-speed steel plug tap

  • HSS construction resists wear during threading operations
  • Plug style suits through-hole tapping tasks
  • Taper start aligns threads square with workpiece
  • 5/16"-56 size fits specific thread requirements
  • Proposition 65 notice flags chemical safety warnings

5/16"-56 HSS Plug Hand Tap

This high-speed steel hand tap cuts 5/16"-56 threads in through holes. It suits general machine tapping, CNC work, and manual operations across a broad range of materials. The plug chamfer starts the thread square with the workpiece for reliable alignment.

Thread capacity and limits

The tap handles standard 5/16"-56 thread production in through-hole conditions with consistent chip clearance. It runs out when a blind hole requires threads to the very bottom, where a bottoming chamfer would be necessary instead.

HSS construction and plug chamfer

High-speed steel provides wear resistance for repeated use in ferrous and non-ferrous metals. The plug style means the tap cannot complete threads to the bottom of a blind hole, so a separate bottoming tap is needed for that task.

How it compares

Measured against everything we stock in Garden Hoses & Pipe Tubing, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 85% of the 973 comparable items (median $21.99).

Specifications

Product
Brand nameDRILL AMERICA

Questions about this item

Will the 5/16"-56 plug tap cut clean threads in a through-hole on a vintage 1/2" drill press?

The plug style is designed for through holes and the HSS construction handles general machine tapping, so it will cut square threads on a standard drill press at the correct speed.

How can I verify the 5/16"-56 tap is cutting to the correct pitch after the first few turns?

Check that the thread gauge matches 56 threads per inch and that the major diameter measures .3125 inches on the newly cut threads.

Does the package include a tap wrench or drill bit for the 5/16"-56 size?

The box contains only the HSS plug hand tap; a matching tap wrench and the correct drill bit must be purchased separately.

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