Osg 1313201 Nptf Pipe Tap 1-11/2 5 Flute Hss

Product Description

The OSG 1313201 is a standard NPTF pipe tap designed to cut tapered pipe threads in a range of materials common to plumbing, mechanical, and industrial applications. Manufactured from high-speed steel with an oxide finish, it produces a 1-11/2 thread form conforming to the National Pipe Taper Fuel standard. The tap features 5 flutes with a regular hook geometry and a thread length of 1.75 inches. Overall length is 3.75 inches. With a shank diameter of 1.125 inches and a square drive size of 0.843 inches, the tap is suited for use in standard tap wrenches or machine holders. Licensed plumbers and industrial machinists are the primary installers of this tool.

This tap is intended for threading 1-inch nominal pipe ports and fittings in carbon steel, cast iron, and aluminum workpieces. Typical applications include tapping pipe bungs, manifold ports, valve bodies, and hydraulic or pneumatic fittings where a pressure-tight NPTF thread is required. The NPTF profile creates a dry-seal thread that achieves a pressure-tight joint through thread interference rather than relying solely on sealant. It is appropriate for both shop and field use where a controlled, repeatable pipe thread is needed.

Key Features

• NPTF thread form produces a dry-seal, pressure-tight thread without relying on sealant alone
• High-speed steel construction provides durability across carbon steel, cast iron, and aluminum
• Oxide finish improves lubrication retention and reduces galling during cutting
• 5-flute design with regular hook geometry for balanced cutting and chip clearance
• Thread length of 1.75 inches accommodates standard pipe thread engagement depth
• Compatible with standard tap wrenches and machine tool holders via 1.125-inch shank

Compatibility

Designed for tapping 1-inch nominal NPTF pipe threads in carbon steel, cast iron, and aluminum workpieces. Part of OSG Series 118.

Installation Notes

This tap should be installed by a licensed plumber, pipefitter, or machinist familiar with pipe thread standards. Secure the workpiece firmly before tapping, and apply a suitable cutting fluid rated for the workpiece material to extend tool life and improve thread quality. Ensure the tap is started square to the hole to prevent thread misalignment. Follow shop safety practices and applicable codes when tapping threaded pipe connections in pressurized systems.