Hertel R127267K-S 1/4-18 Npt Pipe Tap 5 Flute Hss Chrome

Product Description

The HERTEL R127267K-S is a 1/4-18 NPT interrupted thread pipe tap ground from high speed steel and finished with a chrome plating. Interrupted thread geometry reduces chip packing in blind or deep holes by providing relief between cutting edges, which lowers torque demand and extends tool life in production tapping operations. The tap features 5 flutes and a regular hook angle, making it suited for a broad range of ferrous and non-ferrous materials. Overall length is 2.4375 inches with a thread length of 1.0625 inches. The 0.5625-inch shank diameter accepts standard tap collets and chucks. Machinists, pipefitters, and maintenance technicians use this tap when threading pipe fittings, manifolds, and port connections to NPT standard.

This tap is designed for cutting 1/4-18 NPT internal pipe threads in metal workpieces such as fittings, valve bodies, hydraulic blocks, and manifold ports. The NPT taper thread profile creates a pressure-sealing fit when assembled with compatible NPT fittings, which is common in plumbing, HVAC refrigerant piping, pneumatic, and hydraulic system fabrication. The interrupted thread design is particularly effective in CNC and production-line environments where chip control and consistent thread quality across high cycle counts are priorities. Suitable for use in machine tapping and hand tapping applications.

Key Features

• Interrupted thread geometry reduces chip packing and lowers tapping torque
• 5-flute design provides multiple cutting edges for consistent NPT thread form
• Chrome plating improves surface hardness and lubricity for extended tool life
• High speed steel construction withstands heat generated in continuous tapping cycles
• Regular hook angle suits a wide range of common workpiece materials
• 0.5625-inch shank diameter fits standard tap holders and collet chucks

Compatibility

Designed to cut 1/4-18 NPT taper pipe threads and compatible with standard tap holders, collet chucks, and tapping heads accepting a 0.5625-inch round shank with a 0.4210-inch square drive.

Installation Notes

Installation should be performed by a qualified machinist or pipefitter using appropriate tapping fluid or cutting oil for the workpiece material. Ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the bore before engaging. Always back the tap out periodically to clear chips, particularly in blind holes. Follow applicable shop safety procedures and relevant piping code requirements when the finished threaded port will carry pressurized fluid or gas.