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Spiral point tap, high-speed steel, TiCN finish, three flutes

Greenfield Threading

Greenfield Threading 330161 Spiral Point Tap 3/8-16 UNC 3 Flutes

SKU CH-X7G6-AP2QK

Spiral point tap cuts 3/8-16 UNC threads in through-holes with three flutes and TiCN coating

  • Spiral point pushes chips ahead for smoother tapping in through holes
  • Three-flute design balances strength and chip clearance for reliable thread cutting
  • High-speed steel with TiCN coating resists wear and extends tool life
  • H3 thread limit and 2B class of fit deliver precise 3/8-16 UNC threads
  • Right-hand cut matches standard threading operations for broad compatibility

Spiral Point Tap for 3/8-16 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 3/8-16 UNC sizing suits general-purpose fastening in steel and similar materials. It is built for machinists and maintenance technicians who need reliable thread production.

H3 Thread Limit and 2B Class of Fit

The H3 limit and 2B fit define the allowable pitch-diameter tolerance for the finished thread. These specifications set the practical boundaries for thread engagement and interchangeability with mating hardware. The tap will not produce threads outside this tolerance band.

Three-Flute High-Speed Steel with TiCN

Three flutes on high-speed steel provide cutting strength and chip clearance for moderate production runs. The TiCN coating adds wear resistance that extends tool life in abrasive or tough alloys. The 0.3125 inch drill size prepares the correct 75 percent thread depth for this tap.

How it compares

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

Price $11.99
Cheaper than about 84% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

How do I choose between the available versions of this 330161 spiral point tap?

This 330161 model is a single specification: 3/8-16 UNC, H3 limit, 2B fit, three flutes, TiCN-coated high-speed steel. There are no alternative capacities or versions listed for this part number.

What does the 3/8-16 UNC thread size mean when I use this tap in a real job?

It cuts a standard coarse Unified National thread, 3/8 inch major diameter with 16 threads per inch, to a 2B class of fit using the H3 pitch diameter limit.

What does the TiCN coating on this high-speed steel tap actually withstand in practice?

The TiCN coating increases surface hardness and wear resistance over uncoated HSS, extending tool life in steel, stainless and non-ferrous materials at conventional cutting speeds.

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