Osg 1312500 Nptf Pipe Tap 1/16-27 4 Flute Hss

Product Description

The OSG 1312500 is a standard pipe tap designed to cut National Pipe Taper Fuel (NPTF) threads in a 1/16-27 configuration. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap produces a pressure-tight, dryseal thread without the need for a sealant when properly used. It features 4 flutes with a regular hook geometry and is sized for small-diameter pipe fittings common in fuel, hydraulic, and pneumatic systems. With an overall length of approximately 2.13 inches and a thread length of 11/16 inches, it fits standard tap handles and machine setups. Licensed machinists, pipefitters, and maintenance technicians rely on this tap for precision thread-cutting in tight clearance applications.

The OSG 1312500 is suited for threading carbon steel, cast iron, and aluminum workpieces. Its NPTF thread profile makes it appropriate for fuel lines, hydraulic manifolds, small instrument fittings, and pressure ports where a dryseal connection is required. The 1/16-27 size is frequently encountered in instrumentation fittings, pressure gauge ports, and small-bore hydraulic components found in both industrial and mechanical service applications. This tap is sold individually and is intended for hand tapping or low-speed machine tapping operations.

Key Features

• NPTF thread profile produces dryseal pressure-tight connections without sealant
• High-speed steel construction provides toughness and wear resistance in ferrous and non-ferrous materials
• 4-flute regular hook geometry for balanced cutting action and chip clearance
• Bright uncoated finish suitable for general-purpose tapping in carbon steel, cast iron, and aluminum
• Compact 1/16-27 size designed for small-diameter pipe thread applications in instrumentation and hydraulics
• Standard shank diameter of 0.3125 inches fits common tap wrenches and collet holders

Compatibility

Designed as an OEM-style replacement or standard tooling option for applications requiring 1/16-27 NPTF pipe threads in carbon steel, cast iron, and aluminum workpieces. Compatible with standard tap handles and machine tool collets sized for a 0.3125-inch shank diameter.

Installation Notes

This tap should be used by qualified machinists, pipefitters, or maintenance technicians familiar with pipe thread-cutting procedures. Always secure the workpiece firmly and use an appropriate cutting fluid for the material being tapped to reduce heat and extend tool life. For hand tapping, use a properly sized tap wrench and advance the tap in short increments, backing off periodically to break chips. Never apply excessive torque or force the tap through hard material, as HSS taps are susceptible to breakage under shock loads.