Hertel G837520-S Pipe Tap 3/8-18 Npt 4 Flute Hss

Product Description

The HERTEL G837520-S is a standard pipe tap designed to cut 3/8-18 NPT internal threads in metal workpieces. It is manufactured from high speed steel and features a bright, uncoated finish suited for general-purpose tapping applications. The tap has 4 flutes and a short projection design, with a thread length of 1-1/16 inches. A shank diameter of 0.700 inches and a square size of 0.531 inches allow it to seat securely in standard tap wrenches and machine holders. Machinists, pipefitters, and plumbers use this tap to create NPT-tapered threads for pipe fittings, valves, and threaded connections in ferrous and non-ferrous materials.

This tap is suited for creating NPT pipe threads in light to medium-duty applications including pipe fitting installations, repair work, and fabrication. The 3/8-18 NPT designation refers to a 3/8-inch nominal pipe size with 18 threads per inch, a common thread standard used across plumbing, HVAC, and industrial piping systems. It is appropriate for use in both shop and field tapping operations where an NPT-tapered thread is required for a pressure-rated connection.

Key Features

• 3/8-18 NPT thread standard for tapered pipe thread applications
• High speed steel construction for durability in general tapping use
• 4-flute geometry for effective chip evacuation during cutting
• Short projection design for use in confined or limited-clearance installations
• Bright, uncoated finish suitable for use with cutting fluids across a range of materials
• Thread length of 1-1/16 inches provides sufficient engagement depth for standard NPT connections

Compatibility

Designed as an OEM-style replacement or standard tooling tap for applications requiring 3/8-18 NPT internal threads in pipe, fittings, and threaded port machining operations.

Installation Notes

This tap is installed by machinists and pipefitters using a standard tap wrench or tapping attachment on a drill press or milling machine. Always use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Ensure the pilot hole is drilled to the correct tap drill size for 3/8-18 NPT before tapping. Do not force or back-drive the tap beyond resistance, as high speed steel tools are subject to breakage under excessive torque.