Hertel R127437K-S 3/8-18 Npt Pipe Tap 5 Flute Hss

Product Description

The HERTEL R127437K-S is a 3/8-18 NPT interrupted thread pipe tap manufactured from high-speed steel with a chrome plated finish. It features 5 flutes and a regular hook geometry designed to cut tapered pipe threads in a range of metallic materials. Interrupted thread geometry reduces cutting forces and improves chip evacuation, making it well suited for tapping through-holes and blind holes where chip buildup is a concern. The overall length is 2-9/16 inches with a 0.7-inch shank diameter and a 1-1/16-inch thread length. A 0.53-inch square drive end provides positive engagement with standard tap wrenches or machine holders.

This tap is used by machinists, pipefitters, and maintenance trades to cut NPT pipe threads in metal workpieces such as manifolds, fittings, housings, and structural components. NPT threads are standard in plumbing, HVAC, and industrial piping applications where a pressure-rated tapered thread seal is required. The 3/8-18 size is a common thread designation for 3/8-inch nominal pipe connections and is frequently used in gas, water, and pneumatic line assemblies across residential and commercial installations.

Key Features

• Interrupted thread design reduces cutting forces and improves chip clearance
• 5-flute geometry provides smooth, efficient thread cutting action
• High-speed steel construction offers heat and wear resistance during tapping operations
• Chrome plated finish improves surface hardness and corrosion resistance
• Regular hook angle suits a broad range of ferrous and non-ferrous materials
• Square drive end compatible with standard tap wrenches and machine holders

Compatibility

Designed for cutting 3/8-18 NPT tapered pipe threads in metallic workpieces. Suitable for use with standard hand tap wrenches and machine tapping setups that accept a 0.7-inch round shank with 0.53-inch square drive.

Installation Notes

This tap is installed and operated by machinists or qualified tradespeople using appropriate tap wrenches or CNC tapping equipment. Always ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill size for 3/8-18 NPT before beginning the threading operation. Apply cutting fluid throughout the tapping process to reduce heat buildup and extend tool life. Reverse the tap periodically when hand tapping to break chips and prevent tap breakage.