Hertel R128114-S Extension Pipe Tap 1/4-18 Npt Hss

Product Description

The HERTEL R128114-S is a 1/4-18 NPT extension pipe tap designed for threading pipe fittings and threaded ports in tight or recessed locations where a standard-length tap cannot reach. Built from high speed steel (HSS) with a bright finish, this tap delivers reliable cutting performance across cast iron, mild steel, and similar ferrous materials. The plug chamfer allows the tap to start easily in a pre-drilled hole and is the standard choice for through-hole and most blind-hole pipe thread applications. With a 4-inch overall length and a 0.5625-inch shank diameter, it is compatible with standard tap wrenches and extension-style tap holders used by machinists, pipefitters, and maintenance technicians.

This tap is suited for creating NPT-standard tapered pipe threads in metalworking, maintenance, and fabrication environments. Its extended reach makes it practical for threading ports on manifolds, valve bodies, compressor housings, and similar assemblies where thread depth or part geometry prevents the use of a shorter tap. Typical users include industrial maintenance technicians, pipefitters, and machine shop operators working on fluid system components.

Key Features

• 1/4-18 NPT tapered pipe thread form for standard-pressure fluid and gas fittings
• High speed steel construction for durability across common ferrous workpiece materials
• Plug chamfer (3-5 thread lead) for easy starting in pre-drilled through holes and most blind holes
• 4-flute design for efficient chip evacuation during tapping
• Extended 4-inch overall length provides reach into recessed or deep-set ports
• Bright finish with no coating interference for standard cutting oil or tapping fluid use

Compatibility

Designed as an OEM-style replacement or direct-use extension pipe tap for applications requiring 1/4-18 NPT threads in metallic workpieces.

Installation Notes

This tap is intended for use by machinists, pipefitters, and maintenance technicians with appropriate metalworking training. Always secure the workpiece firmly before tapping and use a proper cutting or tapping fluid to extend tool life and improve thread quality. Align the tap square to the drilled hole before applying torque to prevent tap breakage. Follow applicable facility safety procedures and relevant codes when threading components for pressurized fluid or gas systems.