Hertel K015977AS Extension Pipe Tap 3/8-18 Nptf Hss

Product Description

The HERTEL K015977AS is a 3/8-18 NPTF extension pipe tap designed for cutting tapered pipe threads in metal workpieces where standard-length taps cannot reach. Built from high speed steel with a bright finish, this tap delivers reliable thread form in ferrous and non-ferrous materials. The 5-flute geometry supports chip evacuation during tapping operations. At 6 inches overall length with a 0.7-inch shank diameter, it provides the extended reach required for deep-hole and recessed-port applications. The interrupted thread design reduces cutting friction and helps prevent tap breakage in tougher materials. Machinists and pipefitters use this tap when threading ports, fittings, and manifold passages that require a true NPTF taper seal.

This tap is suited for production and maintenance applications where NPTF tapered pipe thread forms are required for pressure-tight connections without sealant. Common applications include hydraulic manifolds, pneumatic fittings, fuel system components, and plumbing port threads in metal housings. The extension length makes it practical for deep bores and recessed bosses that standard pipe taps cannot access. The 5-flute design is appropriate for through-hole and blind-hole threading in materials where chip control is a priority.

Key Features

• 3/8-18 NPTF thread form produces pressure-tight tapered pipe threads
• 5-flute geometry improves chip evacuation and reduces cutting torque
• Interrupted thread design lowers friction and reduces the risk of tap breakage
• 6-inch overall length provides extended reach for deep or recessed bores
• High speed steel construction maintains edge integrity across a range of metals
• Bright finish with 0.7-inch shank diameter for use in standard tap holders and extension drivers

Compatibility

Designed for use in any application requiring a 3/8-18 NPTF tapered pipe thread form in metal. The 0.7-inch shank diameter is compatible with standard tap holders and machine spindles sized for that shank.

Installation Notes

This tap is installed by qualified machinists or pipefitters using a tap wrench, tapping head, or CNC spindle matched to the 0.7-inch shank. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Ensure the workpiece is securely fixtured before starting the cut. Follow NPTF thread inspection procedures with a tapered pipe thread gauge to verify sealing engagement after tapping.