Hertel R837561-S Pipe Tap 1-1/4 11-1/2 Npt 5 Flute Hss

Product Description

The HERTEL R837561-S is a standard NPT pipe tap designed for cutting 1-1/4 inch - 11-1/2 TPI tapered pipe threads in metal workpieces. Built from high speed steel (HSS) with a bright, uncoated finish, this tap delivers consistent thread form across a range of ferrous and non-ferrous materials. The short projection design keeps the cutting geometry compact, making it suitable for tight-clearance tapping operations. With 5 flutes and a 1.75-inch thread length, it provides reliable chip evacuation and accurate thread depth. Overall length is 4 inches. Plumbers, pipefitters, and machining professionals typically select this tap for pipe fitting and valve body thread work.

This pipe tap is used in applications requiring NPT-standard tapered pipe threads for pressure-tight connections in plumbing, gas piping, hydraulic, and industrial fluid systems. The 1-1/4 inch NPT thread size is common in residential and light commercial plumbing, gas line fittings, and industrial manifold work. It is suited for both manual tapping with a tap wrench and machine tapping setups where controlled feed rates are maintained. The short projection geometry makes it appropriate for applications where tool stick-out must be minimized.

Key Features

• NPT tapered thread form for pressure-tight pipe connections
• High speed steel construction for durability across common pipe materials
• 5-flute design promotes chip evacuation during tapping
• Short projection tap type for reduced overhang in constrained setups
• Bright, uncoated finish suitable for general-purpose use with cutting fluid
• 1.75-inch thread length accommodates full NPT thread engagement depth

Compatibility

Designed as an OEM-style replacement or direct-use pipe tap for applications requiring 1-1/4 inch - 11-1/2 NPT tapered pipe threads in standard pipe tap holders and compatible tap wrenches or machine spindles accepting a 1.3125-inch shank diameter.

Installation Notes

This tap should be installed and operated by qualified machinists, pipefitters, or plumbers familiar with tapping procedures. Always secure the workpiece fully before tapping and use an appropriate cutting fluid to reduce heat and extend tool life. For machine tapping, set feed rate to match the thread pitch to avoid tap breakage. Inspect the tap for wear or chipping before each use and replace if cutting edges are damaged.