Hertel R127784K-S Pipe Tap 1 11-1/2 Npt 5 Flute Hss

Product Description

The HERTEL R127784K-S is a standard NPT pipe tap designed for cutting internal tapered pipe threads in metal workpieces. Built from high speed steel with a chrome finish, it delivers the hardness and wear resistance needed for production tapping in ferrous and non-ferrous materials. This tap cuts a 1 inch 11-1/2 NPT thread profile, the standard taper used in pressure-rated pipe and fitting connections across plumbing, HVAC, and industrial piping systems. The 5-flute design provides a regular hook angle for consistent chip evacuation in through-hole and blind applications. Machinists, pipefitters, and maintenance technicians use this tap when threading ports, fittings, or manifold bodies to accept standard NPT male pipe threads.

This tap is suited for threading operations on pipe flanges, manifolds, valve bodies, and mechanical assemblies that require a leak-resistant tapered thread connection. The 1 inch 11-1/2 NPT size is widely specified in commercial plumbing, hydronic heating, refrigeration piping, and industrial fluid handling systems. It is appropriate for both manual tapping with a tap wrench and machine tapping in a drill press or CNC setup with proper feed control and cutting fluid.

Key Features

• 1 inch 11-1/2 NPT thread profile for standard tapered pipe thread applications
• High speed steel construction for durability in ferrous and non-ferrous materials
• Chrome finish resists corrosion and reduces friction during cutting
• 5-flute design with regular hook angle supports stable chip flow
• 1.75 inch thread length accommodates full NPT taper engagement
• Shank diameter of 1.125 inches and square drive size of 0.843 inches for secure tap wrench or machine chuck fitment

Compatibility

Designed as an OEM-style pipe tap for use in standard NPT pipe threading operations on compatible workpieces requiring a 1 inch 11-1/2 tapered pipe thread form.

Installation Notes

This tap is installed and used by machinists, pipefitters, or maintenance technicians performing threading operations. Always apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Secure the workpiece firmly before tapping and align the tap perpendicular to the hole to prevent thread damage or tap breakage. When machine tapping, use a tapping head or controlled feed to maintain proper axial alignment throughout the cut.