Osg 1205300308 Interrupted Thread Pipe Tap 1/4-18 Npt

Product Description

The OSG 1205300308 is a 1/4-18 NPT interrupted thread pipe plug tap designed for threading pipe fittings and plugged ports in tough materials. The interrupted thread geometry reduces cutting torque and chip packing, making it well-suited for deep or blind pipe tap applications. At 2.44 inches overall length with a 1.062-inch thread length and a 0.5625-inch shank diameter, this tap fits standard tap wrenches and machine spindles. The TICN coating provides enhanced surface hardness and lubricity for extended tool life in abrasive workpiece materials. It is used by machinists, pipefitters, and maintenance technicians working in industrial, commercial, and trade shop environments.

This tap is intended for cutting 1/4-18 NPT internal pipe threads in a range of ferrous materials including carbon steel, cast iron, die steel, and stainless steel. It belongs to OSG Series 12053 and carries a 3-flute interrupted thread design that improves chip evacuation during tapping operations. Typical applications include creating threaded ports for pipe plugs, fittings, and instrumentation connections in fabricated assemblies, manifolds, and machinery housings.

Key Features

• Interrupted thread design reduces cutting torque and minimizes chip packing in blind holes
• TICN coating increases surface hardness and extends tool life in abrasive materials
• 3-flute geometry promotes chip evacuation during through and plug tapping
• 1/4-18 NPT thread form for standard pipe plug and fitting applications
• 0.5625-inch shank diameter compatible with standard tap holders and wrenches
• Suitable for carbon steel, cast iron, die steel, and stainless steel workpieces

Compatibility

Designed for cutting 1/4-18 NPT internal pipe threads in carbon steel, cast iron, die steel, and stainless steel. Compatible with standard tap wrenches and machine tool holders accepting a 0.5625-inch shank.

Installation Notes

This tap is installed by machinists or qualified maintenance technicians using a tap wrench, tapping head, or CNC machine tool. Always use appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 1/4-18 NPT before tapping. Do not force or reverse the tap abruptly in interrupted cuts, as this can cause breakage.