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Bright steel spiral-point tap with three straight flutes and a plug chamfer

Cleveland

Cleveland C57180 Spiral Point Tap 3/8"-24 UNF 3 Flutes Bright

SKU CH-PRT4-409T0

Spiral-point tap cuts 3/8"-24 UNF threads in through-holes with three flutes and a bright HSS finish

  • Right-hand threading matches standard fasteners
  • Spiral-point design pushes chips ahead of the cut
  • Three flutes balance strength and chip clearance
  • High-speed steel construction resists wear in general use
  • Bright uncoated finish suits non-ferrous and low-carbon steel

3/8"-24 UNF Spiral Point Tap

The Cleveland C57180 is a high-speed steel spiral point tap designed for creating unified fine threads in through-hole applications. It suits machinists and maintenance technicians who need reliable thread cutting in steel and non-ferrous metals. The plug chamfer provides a balanced start for general-purpose threading tasks.

Bright Uncoated High-Speed Steel Build

The bright uncoated finish on high-speed steel offers economical performance for short-run or manual tapping operations. Three flutes provide efficient chip evacuation ahead of the cut, reducing torque and the risk of flute clogging during use. The right-hand thread orientation matches standard fastener conventions for straightforward installation.

H2 Limit and 75 Percent Thread Depth

The H2 thread limit produces a class 2B fit, which may feel loose for applications requiring tighter tolerance control. A 75 percent thread drill size of 8.50 mm limits engagement depth, so the tap is not suited for high-stress joints needing maximum thread percentage. The fixed 1 1/4 inch thread length restricts reach in deeper through-holes.

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 nameCLEVELAND

Questions about this item

What thread standard does the 3/8"-24 tap follow, and what class of fit does it produce?

It follows the UNF standard and produces a 2B class of fit with an H2 thread limit.

What size tap drill is required for the 3/8"-24 thread?

Use an 8.50 mm drill to achieve the 75 percent thread depth.

How do you start the tap correctly in the drilled hole?

Apply cutting fluid, align the tap squarely, and turn the plug chamfer straight in to avoid cross-threading.

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