Osg 1313005 Pipe Tap 1/2-14 Nptf 4 Flute Hss Tin

Product Description

The OSG 1313005 is a standard pipe tap designed to cut 1/2-14 NPTF (National Pipe Taper Fuel) threads in a range of materials including carbon steel, cast iron, and aluminum. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers hardness and surface lubricity for consistent thread quality in production and repair environments. The tap features 4 flutes with a regular hook angle and a standard thread profile, giving machinists and tradespeople reliable chip clearance during through and blind-hole tapping operations. Overall length is 3.125 inches with a 1.375-inch thread length.

This tap is suited for plumbing, HVAC, and mechanical piping applications where NPTF-standard pressure-tight threads are required. It is used by pipefitters, plumbers, and machinists when threading ports in fittings, manifolds, valve bodies, and equipment housings. The NPTF profile produces a mechanically sealed joint without relying solely on thread sealant, making it appropriate for fuel, hydraulic, and pneumatic service ports. Series 118 designates its place in OSG's standard pipe tap lineup.

Key Features

• 1/2-14 NPTF thread form for pressure-tight tapered pipe thread joints
• High-speed steel construction for strength across carbon steel, cast iron, and aluminum
• TiN coating reduces friction and extends tool life in repeat-use applications
• 4-flute design with regular hook for efficient chip evacuation
• Standard thread profile compatible with NPTF gauging requirements
• Shank diameter of 0.6875 inches with a square drive size of 0.515 inches for positive tap-wrench engagement

Compatibility

Designed for threading 1/2-14 NPTF pipe thread forms in carbon steel, cast iron, and aluminum workpieces. Fits standard tap wrenches and machine holders sized for a 0.6875-inch shank diameter.

Installation Notes

This tap should be installed and operated by a qualified machinist, pipefitter, or plumber familiar with tapered pipe thread procedures. Secure the workpiece before tapping and use cutting oil or an appropriate tapping fluid to reduce heat buildup and improve thread finish. Apply even, consistent pressure and back off periodically to break chips and prevent tap binding. Do not force the tap if resistance increases unexpectedly, as HSS tooling is susceptible to breakage under torsional overload.