Osg 1313401 Pipe Tap 1-1/2-11-1/2 Nptf 7 Flute Hss

Product Description

The OSG 1313401 is a standard pipe tap designed to cut National Pipe Taper Fuel (NPTF) threads in through-hole and blind-hole applications. Built from high-speed steel with an oxide finish, this tap produces a 1-1/2 - 11-1/2 thread size at 11.5 threads per inch. The 7-flute geometry distributes cutting load evenly, reducing chatter and extending tool life in demanding tapping operations. With an overall length of 4.25 inches and a thread length of 1.75 inches, this tap is suited for production and maintenance environments where consistent, pressure-tight pipe threads are required. It is installed by licensed plumbers, pipefitters, and machinists working in fluid and gas piping systems.

This tap is used in residential, commercial, and industrial piping applications where NPTF-standard threads are specified for leak-free, pressure-tight connections without the need for additional sealants. Typical applications include tapping pipe fittings, manifolds, valve bodies, and hydraulic or pneumatic housings. Compatible material applications include carbon steel, cast iron, and aluminum. The OSG Series 118 designation places it in a well-established product line recognized in machining and pipe-trade settings.

Key Features

• NPTF thread profile ensures pressure-tight pipe connections without relying on thread sealant
• 7-flute design distributes cutting forces evenly for smoother operation and reduced tool wear
• High-speed steel construction provides durability across carbon steel, cast iron, and aluminum workpieces
• Oxide finish improves lubrication retention and offers mild corrosion resistance during storage and use
• Standard hook geometry suits general-purpose tapping in a range of machine and hand-tap applications
• 1.5-inch shank diameter and 1.125-inch square size match standard tap holders and wrenches for this size class

Compatibility

Designed for use in carbon steel, cast iron, and aluminum workpieces requiring 1-1/2 - 11-1/2 NPTF-standard pipe threads. Fits standard tap holders and tap wrenches accepting a 1.5-inch shank diameter and a 1.125-inch square drive.

Installation Notes

This tap is typically used by machinists, pipefitters, and plumbers operating drill presses, lathes, or tapping machines, as well as in hand-tapping setups. Always apply appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tap life. Ensure the workpiece is securely fixtured and the pilot hole diameter is correct for the thread size before starting. Follow applicable IFGC or IPC requirements when tapping pipe threads in gas or fluid distribution systems.