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Bright steel pipe tap with four straight flutes and a tapered semi-bottoming tip

Cleveland

Cleveland C64118 Pipe Tap 3/8"-18 Semi-Bottoming 4 Flutes NPS

SKU CH-GDGN-60C6H

A semi-bottoming pipe tap cuts 3/8"-18 NPS threads with four flutes in high-speed steel

  • Product typeTaps
  • NPS standard threads for straight pipe connections
  • Semi-bottoming design threads close to blind-hole bottoms
  • Four flutes evacuate chips for smoother cutting
  • High-speed steel resists wear in tough materials
  • 3/8"-18 size fits common conduit and pipe jobs

Cleveland C64118 Pipe Tap – 3/8"-18 NPS Threading

The Cleveland C64118 is a high-speed steel pipe tap designed for cutting 3/8"-18 NPS threads in pipe and conduit. It suits maintenance technicians and fabricators who need to create internal straight pipe threads for mechanical connections. The semi-bottoming chamfer allows threading close to the bottom of a blind hole. Four flutes provide balanced chip evacuation during the cutting process.

High-Speed Steel Construction with Bright Finish

The tap is manufactured from high-speed steel with a bright, uncoated surface that resists corrosion during storage. A right-hand thread direction matches standard piping conventions for assembly. The 4-flute geometry distributes cutting forces evenly across the tool body for consistent thread quality. An overall length of 2 9/16 inches and a thread length of 1 1/16 inches give adequate reach for typical pipe coupling depths.

Thread Size 3/8"-18 NPS

The defining specification is the 3/8"-18 NPS thread size, which determines compatibility with matching pipe fittings. Users must drill the hole to 0.5625 inches to achieve the correct 75 percent thread engagement for this tap. This tool does not suit tapered NPT threads or metric pipe standards. Verify the required thread form before selecting this tap for the job.

How it compares

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

Price $39.99
Pricier than about 61% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

What does the 3/8"-18 NPS thread standard mean for the tap's cutting capability?

The 3/8"-18 NPS designation indicates a straight pipe thread with 18 threads per inch, designed for mechanical joints rather than pressure-tight seals.

What drill size is required to prepare a hole for this 3/8"-18 NPS tap?

A 0.5625 inch drill bit, referenced as the 75 percent thread drill size, creates the correct minor diameter for this tap.

How should the semi-bottoming 4-flute design be used to avoid thread damage?

Start the tap squarely using a tap wrench, apply steady pressure with cutting fluid, and reverse frequently to break chips in blind holes.

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