Osg 1313001 Pipe Tap 1/2-14 Nptf 4 Flute Hss

Product Description

The OSG 1313001 is a standard pipe tap designed to cut NPTF-threaded pipe connections in metal workpieces. It produces a 1/2-14 NPTF thread profile, the tapered form used for pressure-tight pipe joints without sealants. Built from high-speed steel with an oxide finish, it runs 4 flutes and covers a thread length of 1.375 inches. Overall length is 3.126 inches with a shank diameter of 0.6875 inches and a square drive size of 0.515 inches. Machinists, pipefitters, and millwrights reach for this tap when threading ports, fittings, or manifolds in production or repair environments.

This tap is suited for threading 1/2-14 NPTF ports in carbon steel, cast iron, and aluminum workpieces. Typical applications include hydraulic and pneumatic manifold ports, pipe fitting bodies, pump housings, and valve blocks where a dry-seal tapered thread is specified. The regular hook geometry and standard thread profile make it appropriate for use in both manual tap handles and CNC tapping cycles at controlled feed rates.

Key Features

• 1/2-14 NPTF thread form produces a dry-seal, pressure-tight tapered pipe thread
• High-speed steel construction provides wear resistance across carbon steel, cast iron, and aluminum
• Oxide finish improves lubrication retention and reduces initial wear-in friction
• 4-flute design balances chip evacuation with thread support in through and blind port applications
• Regular hook geometry suits both hand tapping and machine tapping operations
• Square drive shank (0.515 inches) fits standard tap wrenches and machine holders

Compatibility

Designed for cutting 1/2-14 NPTF internal threads in carbon steel, cast iron, and aluminum workpieces per the NPTF dry-seal pipe thread standard.

Installation Notes

A licensed machinist or pipefitter should verify correct tap drill size and pilot hole alignment before tapping. Apply cutting fluid appropriate for the workpiece material and maintain consistent feed rate to avoid tap breakage. Secure the workpiece fully before tapping and use a tap guide or machine spindle to keep the tap perpendicular to the bore entry. Inspect threads with an NPTF plug gauge after tapping to confirm conformance before assembly.