Osg 1333200 Standard Pipe Tap 1-11/2 Npsf 5 Flute Hss

Product Description

The OSG 1333200 is a standard pipe tap designed to cut National Pipe Straight Fuel (NPSF) internal threads in a single pass. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap cuts a 1-11/2 thread size at 11.5 threads per inch (TPI). The 5-flute design distributes cutting load evenly and helps clear chips during the threading operation. At 3.752 inches overall length with a 1.75-inch thread length, it is suited for production and maintenance threading tasks where consistent NPSF thread form and fuel-system thread integrity are required. Licensed machinists, pipefitters, and tool-and-die technicians are the primary users.

This tap is intended for threading NPSF pipe connections in fuel-carrying systems where a pressure-tight straight thread is required. It performs in carbon steel, cast iron, and aluminum workpieces. Typical applications include fuel line fittings, hydraulic manifold ports, and industrial pipe assemblies where NPSF straight threads are specified. The 5-flute geometry makes it appropriate for through-hole and controlled-depth pipe thread applications in both shop and field environments.

Key Features

• NPSF thread standard - produces straight fuel pipe threads for pressure-tight connections
• 5-flute geometry distributes cutting forces and aids chip evacuation
• High-speed steel construction provides wear resistance across carbon steel, cast iron, and aluminum
• Bright, uncoated finish - compatible with a wide range of cutting fluids
• Regular hook for standard machine or hand tapping operations
• Square drive shank (0.843 inches) fits standard tap wrenches and machine holders

Compatibility

Designed for use in carbon steel, cast iron, and aluminum workpieces requiring a 1-11/2 NPSF straight pipe thread. Fits standard tap wrenches and CNC tapping holders sized for a 1.125-inch shank diameter.

Installation Notes

This tap is installed by licensed machinists or pipefitters using a tap wrench or CNC tapping machine. Ensure the pilot hole is drilled to the correct tap drill diameter for NPSF threads before starting the tap. Apply an appropriate cutting fluid for the workpiece material throughout the operation to extend tool life and improve thread quality. Never force a tap - back off periodically to break chips and reduce the risk of tap breakage.