Osg 1735305 Npt Pipe Tap 1/4-18 4 Flute Vanadium Hss

Product Description

The OSG 1735305 is a standard NPT pipe tap designed to cut 1/4-18 taper pipe threads in metal workpieces. Built from vanadium high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and improved wear resistance compared to uncoated HSS taps. The 4-flute configuration provides balanced cutting action and chip clearance during threading operations. With an overall length of 2.437 inches and a shank diameter of 0.5625 inches, this tap fits standard tap wrenches and machine spindles. It is installed by machinists, pipefitters, and plumbers creating NPT-threaded ports in pipe fittings, manifolds, valves, and mechanical components.

This tap is suited for threading operations in both carbon steel and stainless steel materials. It is commonly used in plumbing, HVAC, and industrial piping applications where NPT-standard tapered threads are required for pressure-tight joints. The Series 308 designation identifies it within the OSG standard pipe tap product line. It is appropriate for hand tapping and machine tapping setups where a 1/4-18 NPT thread is the target specification.

Key Features

• 1/4-18 NPT taper pipe thread standard for pressure-tight pipe connections
• Vanadium high-speed steel construction for toughness and heat resistance
• TiN coating extends tool life and reduces friction during cutting
• 4-flute design balances chip evacuation and thread form quality
• Thread length of 1-1/16 inches accommodates standard NPT taper engagement
• Compatible with carbon steel and stainless steel workpiece materials

Compatibility

Designed for use in carbon steel and stainless steel workpieces requiring 1/4-18 NPT tapered pipe threads. Fits standard tap wrenches and machine tool holders accepting a 0.5625-inch shank diameter.

Installation Notes

This tap is installed by licensed plumbers, pipefitters, or machinists performing threaded port work. Always secure the workpiece and ensure the tap is started square to the hole before applying cutting pressure. Use an appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel. Follow applicable codes such as the IPC or IFGC when creating threaded connections in pressure-bearing piping systems.