Hertel R867350-S Extension Pipe Tap 1/8-27 Npt Hss

Product Description

The HERTEL R867350-S is a 1/8-27 NPT extension pipe tap designed for cutting internal tapered pipe threads in metal workpieces where standard-length taps cannot reach. Built from high speed steel, it delivers reliable cutting performance across a range of ferrous and non-ferrous materials. The extended 6-inch overall length provides access to recessed bosses, deep holes, and confined threading locations that would otherwise require disassembly or specialized fixturing. With 5 flutes and an interrupted thread design, it clears chips efficiently and reduces cutting torque, making it well suited for production and maintenance threading operations performed by machinists and pipefitters.

This tap is used in applications requiring NPT-standard tapered pipe threads at the 1/8-27 size, commonly found in instrumentation fittings, pressure gauge ports, pneumatic components, and small-diameter pipe assemblies. The extended shank makes it practical for use in HVAC, plumbing, and industrial maintenance environments where thread access is restricted. It is appropriate for both manual tapping with a tap wrench and machine tapping in drill presses or CNC machining centers with appropriate speed and feed settings.

Key Features

• 1/8-27 NPT tapered pipe thread form for pressure-rated pipe fitting connections
• 6-inch overall length provides extended reach into deep or recessed threaded ports
• 5-flute geometry promotes efficient chip evacuation and reduced cutting torque
• Interrupted thread design lowers friction and heat buildup during the cut
• High speed steel construction offers durability across a range of workpiece materials
• 3/4-inch thread length matches standard 1/8-27 NPT engagement requirements

Compatibility

Designed for cutting 1/8-27 NPT internal tapered pipe threads in compatible metallic workpieces. Suitable for use with standard tap wrenches and machine tapping setups accepting this shank size and thread form.

Installation Notes

This tap should be installed and operated by a qualified machinist or pipefitter familiar with NPT thread-cutting procedures. Secure the workpiece fully before beginning the threading operation and apply an appropriate cutting fluid to extend tap life and improve thread quality. When machine tapping, verify spindle speed and feed rate are suitable for the material and tap geometry. Inspect the tap for wear or damage before each use and never force a tap that has become bound in the hole.