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Spiral point tap with black oxide finish three flutes

Greenfield Threading

Greenfield Threading 330316 Spiral Point Tap pneumatic accessory

SKU CH-0FYZ-6CN5F

A spiral-point tap cuts UNF 5/16-24 threads in through-holes using three HSS-E flutes with black-oxide finish

  • Thread Size 5/16 In. -24 UNF for precise fit
  • 3 flutes clear chips efficiently in through holes
  • HSS-E Black Oxide resists wear during repeated use
  • 2 23/32 in overall length reaches deeper threads
  • 11/16 in thread length matches standard tap drill depths

Greenfield 330316 Spiral Point Tap

This Greenfield Threading 330316 Spiral Point Tap is a pneumatic accessory built for creating internal UNF threads. It is made from HSS-E steel with a black oxide finish and features a right-hand cut with three flutes for efficient chip evacuation in through-hole applications.

Suited for through-hole threading in ferrous metals

Machinists cutting 5/16 In. -24 UNF threads in steel or iron will find the spiral point design pushes chips ahead of the tap. It is not for blind holes where chips must be pulled upward, nor for buyers who need a different thread size, pitch, or flute count.

Thread size 5/16 In. -24 UNF with H3 limit

The 5/16 In. -24 UNF thread size and H3 thread limit determine the fit class and gauge compatibility. Verify this exact specification against your engineering drawing before purchase, as a different limit or pitch will produce an incorrect thread.

How it compares

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

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What drill size is required for the 5/16"-24 thread?

Use a size I drill to achieve 75 percent thread depth before tapping.

How should the tap be aligned when starting the cut?

Keep the tap perpendicular to the workpiece and use steady pressure to avoid cross-threading.

When does the tap need replacement?

Replace it when threads show tearing or the tool requires excessive force to cut.

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