Hertel K015925AS25 Extension Pipe Tap 1/2-14 Npt Hss

Product Description

The HERTEL K015925AS25 is an extension pipe tap designed to cut internal 1/2-14 NPT threads in pipe fittings, valves, and threaded ports where standard-length taps cannot reach. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, this tap delivers improved wear resistance and longer tool life compared to uncoated HSS tooling. The plug chamfer style provides a moderate lead-in of approximately 3 to 5 threads, making it well suited for through-hole and semi-blind pipe thread applications. With a 0.6875-inch shank diameter and 6-inch overall length (OAL), it reaches into recessed or deep bores that standard pipe taps cannot access. Four flutes provide efficient chip evacuation during cutting.

This extension pipe tap is used by plumbers, pipefitters, machinists, and maintenance technicians working on steel pipe assemblies, hydraulic manifolds, pneumatic housings, and industrial piping systems. The 1/2-14 NPT thread form is one of the most common tapered pipe thread sizes in North American trade work, appearing in gas lines, water lines, compressed air fittings, and instrumentation ports. The extended OAL makes this tap especially practical in fabrication and repair scenarios where access depth is a limiting factor.

Key Features

• 1/2-14 NPT tapered pipe thread form for standard North American pipe connections
• High speed steel construction provides toughness across a range of workpiece materials
• TiN coating increases surface hardness and reduces friction for extended tool life
• Plug chamfer (3 to 5 thread lead) suits through-hole and semi-blind pipe thread cutting
• 6-inch OAL and 0.6875-inch shank diameter enable reach into deep or recessed bores
• 4-flute design promotes chip clearance during threading operations

Compatibility

Designed for use in any application requiring a 1/2-14 NPT internal thread. Compatible with standard tap handles, extension tap wrenches, and machine tap holders sized for a 0.6875-inch shank diameter.

Installation Notes

This tap is installed by qualified machinists, pipefitters, or maintenance technicians using appropriate tap handles or machine setups. Always secure the workpiece before tapping and use a cutting fluid compatible with the workpiece material to reduce heat and improve thread finish. Align the tap squarely with the bore centerline before applying torque to prevent tap breakage. Follow applicable shop safety practices and relevant codes when tapping threaded pipe connections in pressurized systems.