Osg 1315700 Pipe Tap 1-11/2 Npt 5 Flute Hss

Product Description

The OSG 1315700 is a 1-11/2 NPT interrupted thread pipe tap manufactured from high-speed steel with a bright finish. It is designed for cutting internal pipe threads in a range of metallic materials and is used primarily by machinists, pipefitters, and maintenance technicians in fabrication, repair, and industrial piping applications. The interrupted thread geometry reduces chip packing and cutting resistance in deep or blind holes, making it well suited for tougher materials. Key dimensional specs include a 3-3/4 inch overall length, a 1-3/4 inch thread length, and a 1-1/8 inch shank diameter with a 0.843 inch square drive size.

This tap is applied in production and maintenance environments where NPT-standard internal threads are required. Its five-flute configuration and regular hook geometry make it appropriate for use in aluminum, carbon steel, cast iron, and hardened steel workpieces. The 11.5 threads per inch pitch matches the ANSI NPT standard for 1-inch pipe fittings. It is part of the OSG Series 108G and is suited for both manual and machine tapping operations in shop or field settings.

Key Features

• Interrupted thread design reduces chip load and helps prevent tap binding in difficult materials
• Five-flute geometry improves chip evacuation compared to standard three- or four-flute pipe taps
• High-speed steel construction provides durability across aluminum, carbon steel, cast iron, and hardened steel
• Bright finish with no coating for applications where coated tools are not required or preferred
• Regular hook angle for general-purpose tapping performance
• 2-1/2 chamfer lead eases thread entry and starting alignment

Compatibility

Designed for cutting 1-11/2 NPT internal threads per ANSI pipe thread standards. Compatible with aluminum, carbon steel, cast iron, and hardened steel workpieces as specified by the manufacturer for OSG Series 108G pipe taps.

Installation Notes

Installation requires appropriate tapping fluid or cutting oil matched to the workpiece material — always consult material-specific recommendations before tapping hardened steel. Secure the workpiece and ensure the tap is started square to the hole to prevent thread misalignment or tap breakage. Interrupted thread taps require standard tap wrenches or machine tap holders rated for the shank size. Follow applicable shop safety procedures and power down any associated machinery before manual tap operation.