Osg 1651500108 Spiral Point Tap 4-40 Unc Ticn

Product Description

The OSG 1651500108 is a spiral point tap designed for threading 4-40 UNC holes in a wide range of metals. It features a plug chamfer, 2-flute geometry, and a right-hand thread direction, making it well suited for through-hole tapping applications where chips need to be pushed ahead of the cutting edge. The tap is manufactured from powdered metal (grade PMT15) and finished with a TiCN coating to extend tool life and reduce friction in demanding materials. The 2B class of fit and H2 thread limit deliver consistent, in-tolerance threads for standard fastener applications. Installation is performed by machinists and tool-room technicians.

This tap is engineered for use in alloy steel, aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, hardened steel, and die steel. Its high-performance spiral point geometry makes it a practical choice for CNC machining centers and manual tapping operations alike, wherever controlled chip evacuation is needed in through-hole work. The compact overall length of 2.25 inches suits standard tap holders and hand-tapping accessories used in production and maintenance environments.

Key Features

• 4-40 UNC thread form with right-hand cutting direction and 2B class of fit
• Powdered metal construction (PMT15 grade) for improved wear resistance over high-speed steel
• TiCN coating reduces friction and extends tool life across a broad material range
• Plug chamfer with 2-flute spiral point geometry pushes chips forward for clean through-hole threading
• H2 thread limit ensures consistent fit with standard 4-40 fasteners
• No coolant-through requirement simplifies use in standard tapping setups

Compatibility

Designed for through-hole tapping in alloy steel, aluminum, cast aluminum, cast iron, hardened steel, high-carbon steel, low-carbon steel, medium-carbon steel, stainless steel, and die steel. Part of OSG Series 16515 high-performance spiral point taps.

Installation Notes

Spiral point taps should only be used in through-hole applications where chips can exit freely from the back of the hole. Power down or de-energize any CNC spindle and secure the workpiece before tool changes. Use appropriate tapping fluid or cutting oil for the material being threaded. Follow applicable machining safety standards and shop SOPs for tap installation, torque limits, and speed selection.