Osg 1737805 Pipe Tap 1/4-18 Nptf 4 Flute Tin Hss

Product Description

The OSG 1737805 is a standard pipe tap designed to cut 1/4-18 NPTF (National Pipe Taper Fuel) threads in metal workpieces. Built from vanadium high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life in demanding cutting applications. The 4-flute design provides efficient chip evacuation and thread form accuracy. With an overall length of 2.437 inches and a thread length of 1.0625 inches, this tap fits standard tap handles and machine setups. It is used by machinists, pipefitters, and maintenance technicians cutting fuel and fluid-system fittings into ferrous metal components.

This tap is suited for threading pipe-to-fitting connections in carbon steel and stainless steel workpieces where a dryseal NPTF thread form is required. The NPTF profile creates a pressure-tight mechanical seal without relying solely on thread sealant, making it a common choice for hydraulic, pneumatic, and fuel-line ports in industrial and mechanical service applications. The shank diameter of 0.5625 inches and square size of 0.421 inches fit standard tap wrenches and holders sized for this tap class.

Key Features

• NPTF thread profile cuts dryseal taper pipe threads for pressure-tight connections
• Vanadium high-speed steel construction resists heat and wear in ferrous materials
• TiN coating reduces friction and extends cutting edge life
• 4-flute design promotes chip removal and consistent thread form
• Rated for use in carbon steel and stainless steel
• Series 318 standard tap geometry for general pipe threading work

Compatibility

Designed for cutting 1/4-18 NPTF taper pipe threads in carbon steel and stainless steel workpieces. Fits standard tap wrenches and machine tap holders accepting a 0.5625-inch shank diameter.

Installation Notes

This tap is installed and operated by machinists or qualified maintenance technicians using a tap wrench, tapping head, or CNC machine tool. Always secure the workpiece firmly and ensure the pilot hole is drilled to the correct tap drill size for 1/4-18 NPTF before threading. Apply appropriate cutting fluid for the workpiece material to prevent galling, especially in stainless steel. Inspect the tap for wear or chipping before each use and replace if the cutting edges are damaged.