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Bright metal hand tap with three straight flutes and plug chamfer

Greenfield Threading

Greenfield Threading 313504 shelving

SKU CH-9RX2-VN1D2

A 3/8"-16 UNC straight-flute hand tap in high-speed steel with three flutes and a plug chamfer for starting threads in through-holes

  • Straight-flute design cuts clean threads in through-holes
  • High-speed steel construction resists wear during repeated tapping
  • Plug chamfer starts threads easily in blind holes
  • Three flutes balance chip clearance with cutting strength
  • UNC 3/8"-16 sizing matches standard coarse-thread fasteners

Greenfield Threading 313504 straight flute tap

The Greenfield Threading 313504 is a straight flute hand tap designed for creating unified coarse threads. It is made from high speed steel with a bright uncoated finish for general purpose threading tasks.

Suited for manual thread cutting in through holes

This plug style tap suits machinists and maintenance technicians cutting new threads by hand in through holes. It is not suited for blind hole work where chip evacuation requires a bottoming or spiral flute design.

Handles 3/8 inch 16 UNC threads with H11 limit

The tap comfortably produces 3/8 inch minus 16 UNC threads to a class 1B fit with a 75 percent thread depth using a .3125 inch drill size. It runs out when a finer pitch, different diameter or tighter class of fit is required.

Highlights

  • Straight-flute design cuts clean threads in through-holes
  • High-speed steel construction resists wear during repeated tapping
  • Plug chamfer starts threads easily in blind holes
  • Three flutes balance chip clearance with cutting strength
  • UNC 3/8"-16 sizing matches standard coarse-thread fasteners

Specifications

BrandGREENFIELD THREADING

Questions about this item

What drill bit size is needed before tapping with the 3/8"-16 tap?

Use a 0.3125 inch drill bit to create the 75 percent thread hole required for this tap.

Will this tap fit a standard 3/8"-16 UNC die or holder?

Yes, it cuts standard UNC threads with a Class 1B fit, so it matches common 3/8"-16 hardware and holders.

How can I verify the tap is cutting correctly after setup?

Check that the thread gauge reads Class 1B fit and that the tap advances smoothly through the 1 1/4 inch thread length.

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