Hertel R128139-S Extension Pipe Tap 1/2-14 Npt Hss

Product Description

The HERTEL R128139-S is an extension pipe tap designed to cut 1/2-14 NPT internal threads in applications where standard-length taps cannot reach. Built from high speed steel with a bright finish, this tap delivers consistent thread form in ferrous and non-ferrous metals. The bottoming chamfer configuration allows threading to the bottom of a blind hole or close to a shoulder. With an overall length of 6 inches and a 0.579-inch projection, it provides the extended reach needed in recessed ports and deep housings. Four flutes provide adequate chip clearance and balanced cutting action across a range of pipe thread work.

This tap is used in plumbing, HVAC, and industrial piping applications where NPT-threaded connections are required in hard-to-access locations. Typical use cases include threading pipe bosses on manifolds, deep port fittings, valve bodies, and equipment housings where a standard-length tap cannot be started or completed. It is installed by machinists, pipefitters, and maintenance technicians working on both new fabrication and repair threading jobs requiring a bottoming finish.

Key Features

• 1/2-14 NPT thread form for standard tapered pipe connections
• Bottoming chamfer allows threading to the base of blind or near-bottom holes
• 6-inch overall length provides extended reach into recessed ports and deep housings
• High speed steel construction for durability across ferrous and non-ferrous materials
• 4 flutes with regular hook for balanced chip evacuation and cutting stability
• Bright finish with no coating for straightforward visual wear inspection

Compatibility

Designed for use in any application requiring a 1/2-14 NPT bottoming tap with extended reach, including pipe fittings, valve bodies, manifolds, and equipment housings where standard-length taps are insufficient.

Installation Notes

This tap should be installed using a proper tap wrench or machine tapping setup rated for the cutting loads of HSS pipe taps. Ensure the workpiece is securely fixtured before beginning the threading operation. Apply appropriate cutting fluid for the base material to reduce heat buildup and extend tool life. Inspect the tap for wear or chipping before each use, as a damaged tap can damage the workpiece thread form.