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Cleveland C55378 spiral point tap with gold TiCN coating

Cleveland

Cleveland C55378 Spiral Point Tap #6-32 UNC 2 Flutes TiCN

SKU CH-HJP4-QE6ZF

A #6-32 UNC spiral-point tap with two flutes and TiCN coating for through-hole threading

  • Product typeTaps
  • Spiral-point design pushes chips ahead for cleaner through-holes
  • TiCN coating increases surface hardness to extend tap life
  • #6-32 UNC thread with H3 limit meets 2B class-of-fit requirements
  • Two-flute high-speed steel construction balances strength and chip clearance
  • 75 % thread engagement with #36 drill size ensures reliable threads

Thread Size and Standard

The Cleveland C55378 is a spiral point tap designed for cutting internal threads in through-holes. It handles a #6-32 UNC thread size with a 2B class of fit, making it suitable for general-purpose fastening tasks in metalworking and maintenance applications.

Tap Geometry and Drill Requirement

The plug chamfer and two-flute spiral point push chips ahead of the cut, which suits through-hole work but not blind holes. A #36 drill size is specified for 75 percent thread engagement, and the H3 thread limit controls the pitch diameter tolerance for the intended fit.

Coating and Material

High-speed steel construction provides the necessary hardness for threading ferrous and non-ferrous materials. The TiCN coating adds wear resistance and reduces friction compared to uncoated tools, extending service life in repetitive production or repair use.

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 nameCLEVELAND
Product typeTaps

Questions about this item

Which thread size should I choose for a #6-32 UNC hole?

This tap cuts #6-32 UNC threads with a 2B class of fit and H3 limit; select it when the drawing calls for that exact size and tolerance.

What does the 75 percent thread drill size #36 mean when I use the tap?

Drill the hole with a #36 drill to produce roughly 75 percent thread engagement before tapping with this tool.

How does the TiCN coating affect tapping performance in steel?

The TiCN coating increases surface hardness and reduces friction, extending tool life and improving chip evacuation in steel and other ferrous materials.

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