Cleveland C64108 1/8-27 Nptf Interrupted Thread Pipe Tap Hss

Product Description

The CLEVELAND C64108 is a high speed steel interrupted thread pipe tap designed to cut 1/8-27 NPTF tapered pipe threads in metal workpieces. The interrupted thread geometry reduces cutting friction and chip packing, making it well suited for tapping blind or deep holes in tough ferrous materials. This tap features a plug chamfer with 4 flutes and a regular hook angle, providing controlled chip flow during the threading operation. Overall length is 2.125 inches, with a 0.4375-inch shank diameter and a 0.75-inch thread length. It carries a bright finish, indicating no supplemental coating. Machinists, pipefitters, and maintenance technicians working in fabrication, repair, or retrofit applications will find this tap appropriate for hand or machine tapping setups.

This tap is intended for use in alloy steel, tool steel, and carbon steel workpieces requiring a sealed tapered pipe thread connection. The NPTF thread standard ensures a pressure-tight mechanical seal without sealant when paired with a properly tapped hole, making it common in hydraulic fittings, pneumatic manifolds, and fluid system assemblies. The plug chamfer style makes it appropriate for through-hole applications or for starting a thread where full-thread engagement is not required from the top of the hole. It is suited for both manual tapping and use in tapping machines or CNC machining centers.

Key Features

• 1/8-27 NPTF tapered pipe thread form for pressure-tight connections
• Interrupted thread design reduces friction and chip packing in ferrous materials
• 4-flute configuration with regular hook angle for controlled chip evacuation
• Plug chamfer allows easy thread starting in through holes
• High speed steel construction provides durability in alloy steel and carbon steel
• Bright finish, uncoated — suitable for use with cutting fluid in standard tapping operations

Compatibility

Designed for tapping 1/8-27 NPTF threads in alloy tool steel and carbon steel workpieces. Compatible with standard tap holders and tapping heads accepting a 0.4375-inch round shank with a 0.328-inch square drive.

Installation Notes

Installation should be performed by a qualified machinist or pipefitter using a properly sized tap wrench, tapping arm, or CNC tapping head with appropriate speed and feed settings for high speed steel tooling. Always use a compatible cutting fluid to extend tool life and improve thread finish when tapping steel. Secure the workpiece firmly before starting the tap to prevent misalignment. Inspect the tap for chipping or wear before each use and replace if cutting edges are damaged to avoid thread quality issues or tap breakage.