Hertel K015971AS Extension Pipe Tap 1/8-27 Nptf Hss

Product Description

The HERTEL K015971AS is a 1/8-27 NPTF extension pipe tap designed for cutting tapered pipe threads in tight or deep access locations. Manufactured from high-speed steel with a bright uncoated finish, it delivers reliable thread-forming performance in ferrous and non-ferrous materials. The 5-flute geometry with an interrupted thread pattern reduces cutting torque and improves chip evacuation, which is especially important when threading blind or deep holes. The extended 6-inch overall length provides the reach needed in applications where a standard-length tap cannot access the workpiece. Machinist and pipefitter use this tap in production and maintenance environments where NPTF thread standards are required for pressure-tight joints.

This tap is suited for creating 1/8-27 NPTF tapered pipe threads in applications that demand a leak-free, dry-seal connection without the use of sealants. Common install scenarios include threading ports in manifolds, fittings, housings, and pipe flanges found in HVAC, plumbing, and light industrial systems. The extended reach makes it practical for threading recessed bosses or deep-pocket features on fabricated components. The 0.4375-inch shank diameter is compatible with standard machine spindles and tap holders designed for that shank size.

Key Features

• 1/8-27 NPTF thread form produces tapered, pressure-tight dry-seal pipe threads
• 5-flute interrupted thread geometry reduces torque and improves chip clearance
• High-speed steel construction provides durability across a range of workpiece materials
• 6-inch overall length with 0.312-inch projection provides extended reach for deep or obstructed access
• Bright uncoated finish suitable for use with standard cutting fluids
• 0.4375-inch shank diameter fits standard machine tap holders and spindle chucks

Compatibility

Designed for use in any machine spindle or tap holder accepting a 0.4375-inch round shank; compatible with standard tapping machines, drill press setups, and CNC tapping operations requiring 1/8-27 NPTF thread production.

Installation Notes

This tap should be installed and operated by a qualified machinist or pipefitter familiar with tapping operations and NPTF thread standards. Always secure the workpiece and use a cutting fluid appropriate for the material being tapped to extend tool life and ensure thread quality. Power down and de-energize any machine spindle before inserting or removing the tap from the holder. Follow the tool manufacturer and machine builder guidelines for speed, feed, and torque settings appropriate to the workpiece material.