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Gold-coloured spiral point tap with three flutes and square shank

Greenfield Threading

Greenfield Threading Spiral Point Tap 3/8"-16 UNC 3 Flutes TiN 285552

SKU CH-RJAP-Z7XNH

Cuts 3/8"-16 UNC threads in through-holes using a spiral-point design that pushes chips ahead, made from TiN-coated high-speed steel with three flutes for right-hand tapping to class 2B-3B fit

  • Right-hand UNC threading for standard 3/8"-16 holes
  • TiN coating extends tap life in steel applications
  • Spiral point pushes chips forward through the flutes
  • Three-flute design balances strength and chip clearance
  • H5 thread limit produces 2B-3B class fit

Spiral Point Tap 3/8"-16 UNC

This Greenfield Threading spiral point tap cuts 3/8"-16 UNC threads in through-holes. The plug chamfer starts cleanly and pushes chips ahead of the cut. Three flutes on high-speed steel provide steady chip evacuation. TiN coating reduces friction and extends tool life in general-purpose machining.

High Speed Steel TiN Coated 3 Flutes

The tap requires a 0.3125 in drill for 75 percent thread engagement and fits 2B to 3B class of fit. Right-hand cutting suits standard threading operations. H5 thread limit controls tolerance for consistent results. The 3/4 in thread length and 2 15/16 in overall length suit typical through-hole depths without special holders.

Upgrade From Uncoated or Two-Flute Taps

The TiN coating and third flute replace uncoated or two-flute taps when longer tool life and smoother chip flow are needed. The jump is worth it for repeatable production runs in steel or stainless where coating wear resistance pays off. Not for blind holes or left-hand thread requirements where spiral flute or left-hand tools are necessary.

How it compares

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

Price $14.99
Cheaper than about 77% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

How does the H5 thread limit affect hole fit during long production runs?

The H5 limit targets a 2B-3B class of fit, keeping thread tolerance tight even after repeated tapping cycles.

Does the TiN coating reduce heat buildup when the tap runs continuously in steel?

TiN lowers friction and resists wear, so the cutting edges stay cooler during extended use in steel workpieces.

What drill size must I have on hand before using this 3/8"-16 tap?

A 0.3125 in drill is specified for 75 percent thread engagement with this tap.

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