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Bright spiral-point tap, 5/16-18 UNC, three flutes, high-speed steel

Greenfield Threading

Greenfield Threading Spiral Point Tap 5/16"-18 UNC 3 Flutes Bright 357348

SKU CH-FTZ6-2GVVV

Spiral point tap cuts 5/16"-18 UNC threads in through-holes using three flutes and high-speed steel

  • Spiral point pushes chips ahead for smoother through-hole threading
  • 5/16"-18 UNC size matches standard coarse-thread applications
  • Three flutes balance chip clearance with cutting strength
  • High-speed steel construction resists wear during repeated use
  • Bright uncoated finish suits general-purpose tapping tasks

Spiral point tap for 5/16"-18 UNC threads

This Greenfield Threading tap cuts internal threads in through-holes using a spiral point design that pushes chips ahead of the cut. The bright high-speed steel finish suits general-purpose threading in steel and non-ferrous metals. It is built to a Class 2B-3B fit with an H5 thread limit.

Suited for maintenance

Mechanics and machinists who need a reliable plug tap for 5/16"-18 UNC threads will find the three-flute geometry and 11/16 inch thread length practical for through-hole work. Users requiring bottoming taps for blind holes or coated tools for high-volume runs should look elsewhere.

Bright finish and standard drill size

The uncoated surface keeps cost low and allows easy inspection of cutting edges, while the 75 percent thread drill size F simplifies hole preparation. No lubricants, guides or additional accessories are included with the tap.

How it compares

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

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What size drill bit do I need before tapping with the 5/16"-18 spiral point tap?

Use an F-size drill bit to create the 75 percent thread hole before running this 5/16"-18 UNC tap.

Will this tap fit the same 5/16"-18 UNC threads as my older taps?

Yes, it cuts standard UNC threads with a 2B-3B class of fit, matching existing 5/16"-18 hardware.

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

Check that the spiral point pushes chips ahead and the finished threads accept a 5/16"-18 bolt smoothly.

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