Osg 1707601 Spiral Point Tap 5/16-18 Unc Plug 2B

Product Description

The OSG 1707601 is a spiral point tap designed for cutting internal threads in through-hole applications. It features a 5/16-18 UNC thread form with a plug chamfer and a 2B class of fit, making it appropriate for standard tolerance threaded connections. Built from powdered metal with a steam oxide coating, this tap offers improved wear resistance and lubricity compared to standard high-speed steel. It carries an H5 thread limit designation and operates in right-hand thread direction. Licensed machinists and maintenance technicians commonly select this tap for production threading in tough materials where tool life is a priority.

The OSG 1707601 is suited for threading through-holes in hardened steel, stainless steel, high-nickel alloy, and titanium. The spiral point geometry pushes chips ahead of the tap and out through the bottom of the hole, keeping the flutes clear during the cut. This makes it effective in production environments where chip evacuation is critical and consistent thread quality is required across multiple parts. It is used in machine shop, maintenance, and assembly applications where a reliable 5/16-18 UNC threaded hole is needed.

Key Features

• 5/16-18 UNC thread form with plug chamfer for through-hole threading
• 2B class of fit and H5 thread limit for standard tolerance control
• Powdered metal construction for improved toughness over conventional HSS
• Steam oxide coating reduces friction and improves lubricity during cutting
• Spiral point design pushes chips forward, clearing flutes in through-hole operations
• Rated for hardened steel, stainless steel, high-nickel alloy, and titanium

Compatibility

Designed for threading 5/16-18 UNC through-holes in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces. Fits standard tap holders and machine spindles accepting the listed shank diameter. Part of the OSG Series 312NI lineup.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tapping head, CNC machine spindle, or manual tap wrench. Always ensure the workpiece is securely fixtured and the tap is properly aligned with the drilled hole before beginning the cut. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. Do not reverse the tap under load without backing off incrementally to break the chip.