Hertel R867381-S Pipe Tap 3/8-18 Nptf 5 Flute Hss

Product Description

The HERTEL R867381-S is a 3/8-18 NPTF interrupted thread pipe tap manufactured from high speed steel with a bright finish. Interrupted thread geometry reduces chip packing and cutting torque by alternating full-form teeth with relieved teeth, making it effective in through-hole and deep-hole pipe thread applications. The 5-flute configuration provides additional cutting edges for improved thread finish and tool stability. At 2-9/16 inches overall length, the tap is sized for standard hand and machine tapping of 3/8-18 NPTF pipe threads in a range of metalworking and trade fabrication scenarios. Licensed pipefitters, machinists, and HVAC technicians performing threaded pipe assembly work are the primary users of this tool.

This tap is designed for cutting NPTF (National Pipe Taper Fuel) threads, which produce a pressure-tight seal through metal-to-metal contact without relying solely on thread sealant. Common applications include tapping threaded ports in pipe fittings, manifolds, hydraulic blocks, pump housings, and valve bodies where a dryseal pipe thread connection is required. It is suited for use in ferrous and non-ferrous metals where high speed steel performance is adequate. Both hand tapping and low-speed machine tapping operations are appropriate for this tool.

Key Features

• Interrupted thread design reduces chip packing and lowers cutting torque in deep or blind tap applications
• 5-flute geometry increases the number of cutting edges for improved thread form and surface finish
• High speed steel construction provides toughness and wear resistance in general metalworking materials
• Bright (uncoated) finish is compatible with standard cutting oils and tapping fluids
• NPTF thread standard produces a dryseal pressure-tight connection through metal-to-metal interference fit
• 2-9/16 inch overall length fits standard tap wrenches and tapping heads

Compatibility

Designed for cutting 3/8-18 NPTF tapered pipe threads in workpieces where a dryseal pressure-tight thread connection is required. Suitable for use in hand tap and machine tapping setups that accept standard straight-shank pipe taps.

Installation Notes

Pipe taps of this type are installed by machinists or licensed pipefitters using a calibrated tap wrench or tapping attachment. Always apply a suitable cutting fluid or tapping oil to reduce friction and extend tool life. Ensure the workpiece is securely fixtured and the starting hole is drilled to the correct tap drill size for 3/8-18 NPTF before beginning. Back the tap out periodically to clear chips, particularly in ferrous materials.