Osg 1332900 Pipe Tap 3/8-18 Npsf 4 Flutes Hss

Product Description

The OSG 1332900 is a standard pipe tap designed to cut 3/8-18 NPSF (National Pipe Straight Fuel) threads in a range of materials including aluminum, carbon steel, cast iron, and hardened steel. Built from high-speed steel with a bright, uncoated finish, this tap delivers consistent thread form without the added cost of a coating for general-purpose applications. It features 4 flutes and a regular hook geometry, producing clean, accurate threads suited to fuel and fluid line fittings. With an overall length of 2.563 inches and a thread length of 1.0625 inches, it fits standard tap holder setups used by plumbers, pipefitters, and machinists in both shop and field environments.

This tap is used wherever NPSF straight pipe threads are required, typically in fuel system components, hydraulic fittings, and fluid transfer connections. It is well suited for residential and light commercial plumbing and mechanical work where a straight-thread pipe fit is specified. The 3/8-18 thread designation means 18 threads per inch on a 3/8-inch pipe size, a common specification in copper, steel, and cast iron pipe applications. Machinists and pipefitters reaching for a reliable single-unit tap for production or repair work will find this OSG tap a practical, no-frills choice.

Key Features

• 3/8-18 NPSF thread standard for straight fuel pipe thread applications
• High-speed steel construction handles aluminum, carbon steel, cast iron, and hardened steel
• 4-flute design with regular hook for controlled chip evacuation in through and blind holes
• Bright, uncoated finish for general-purpose use without coating-related dimensional offset
• Overall length of 2.563 inches with a 1.0625-inch thread length and 0.700-inch shank diameter
• Square drive size of 0.531 inches for use with standard tap wrenches and holders

Compatibility

Designed as a standard replacement or stock tap for any application requiring 3/8-18 NPSF straight pipe threads. Compatible with standard tap wrenches, tapping heads, and CNC holders sized for a 0.700-inch shank diameter and a 0.531-inch square drive.

Installation Notes

Pipe taps should be installed by a qualified machinist, pipefitter, or plumber following the applicable procedure for the base material. Always secure the workpiece and use appropriate tapping fluid for the material being threaded. Ensure the tap is aligned perpendicular to the hole before engaging to avoid thread runout or tap breakage. Follow applicable code requirements under IPC or IFGC where pipe thread connections are part of a fuel or plumbing system.