Hertel R867379-S Pipe Tap 1/8-27 Nptf 5 Flutes Hss

Product Description

The HERTEL R867379-S is an interrupted thread pipe tap designed for cutting 1/8-27 NPTF internal pipe threads in metal workpieces. Interrupted thread geometry means alternating flutes are relieved, reducing cutting friction, improving chip evacuation, and lowering torque demand in tough materials. Constructed from high speed steel with a bright finish, this tap delivers consistent thread form across production and maintenance applications. With 5 flutes and an overall length of 2.125 inches, it is suited to hand tapping and machine tapping operations where NPTF thread accuracy is required for pressure-tight pipe connections.

This tap is used wherever a dryseal NPTF pipe thread is needed to create a pressure-tight mechanical seal without a sealant compound. Typical applications include machining pipe thread ports in hydraulic manifolds, pneumatic fittings, fluid system housings, and plumbing connection blocks. It is commonly used in maintenance shops, production machining, and field fabrication environments. The 1/8-27 size is one of the most common small pipe thread sizes found in instrumentation, compressed air, and low-pressure fluid fittings.

Key Features

• Interrupted thread design reduces cutting torque and improves chip clearance in blind and through holes
• 1/8-27 NPTF thread form produces dryseal pipe threads for pressure-tight connections
• High speed steel construction provides hardness and wear resistance for ferrous and non-ferrous metals
• Bright finish indicates no coating, maintaining close dimensional tolerances on the tap geometry
• 5 flutes provide more cutting edges and a smoother thread finish compared to fewer-flute designs
• Overall length of 2.125 inches accommodates standard tap holders and hand tap wrenches

Compatibility

Designed for use in standard tap holders, tap wrenches, and CNC tapping heads that accept straight shank taps. Cuts 1/8-27 NPTF dryseal pipe threads per applicable pipe thread standards.

Installation Notes

This tap should be installed and used by machinists or qualified tradespeople familiar with pipe thread tapping procedures. Always use the correct tap drill size for 1/8-27 NPTF threads and apply appropriate cutting fluid for the workpiece material. Secure the workpiece firmly before starting and align the tap perpendicular to the hole to avoid tap breakage. Never force a tap that has stopped advancing, as high speed steel is brittle and will break under excessive torque.