Osg 1333000 Pipe Tap 1/2-14 Npsf 4 Flute Hss

Product Description

The OSG 1333000 is a standard pipe tap designed to cut 1/2-14 NPSF (National Pipe Straight Fuel) internal threads in a range of ferrous and non-ferrous materials. Ground from high-speed steel with a bright, uncoated finish, this tap delivers accurate thread form for fuel and hydraulic line fittings where straight pipe threads are required. It features 4 flutes with a regular hook, an overall length of 3.126 inches, and a thread length of 1.375 inches. The 0.6875-inch shank diameter and 0.515-inch square size fit standard tap wrenches and machine holders used in machining and pipe-fitting applications.

This tap is suited for threading operations in aluminum, carbon steel, cast iron, and hardened steel. Typical applications include cutting straight fuel-line port threads in fittings, manifolds, valve bodies, and machined components where NPSF thread form is specified. It is appropriate for both manual hand-tapping and light machine-tapping setups. The bright finish makes it a general-purpose option where coating-specific performance is not required.

Key Features

• NPSF thread standard - straight pipe thread profile for fuel and fluid fittings
• 4-flute, regular-hook geometry for balanced chip clearance across material types
• High-speed steel construction handles aluminum, carbon steel, cast iron, and hardened steel
• Bright, uncoated finish for general-purpose use without coating-related dimensional offset
• 1.375-inch thread length accommodates standard pipe-port thread depths
• 0.6875-inch shank fits standard tap wrenches and machine collets

Compatibility

Designed for use in any application requiring a 1/2-14 NPSF internal straight pipe thread. Compatible with standard tap wrenches and machine holders accepting a 0.6875-inch shank diameter.

Installation Notes

This tap is installed by a machinist or pipefitter using a calibrated tap wrench or tapping machine set to the appropriate feed and speed for the workpiece material. The workpiece should be secured and the pilot hole drilled to the correct tap drill size for 1/2-14 NPSF threads before tapping begins. Apply cutting fluid appropriate to the base material to improve thread finish and extend tap life. Follow standard shop safety practices and keep the tap aligned with the bore axis to avoid tap breakage.