Osg 1101512705 Spiral Point Tap 3/8-16 Unc Tin Hss

Product Description

The OSG 1101512705 is a spiral point plug tap designed for threading 3/8-16 UNC holes in a wide range of ferrous and non-ferrous metals. Built from vanadium high speed steel and finished with a titanium nitride (TiN) coating, this tap delivers extended tool life and improved chip evacuation in production and maintenance threading applications. The spiral point geometry pushes chips ahead of the cut, making it well suited for through-hole tapping on CNC machines, lathes, or hand tapping setups. With a thread limit of H11 and right-hand thread direction, it meets standard tolerance requirements for general-purpose fastener threads. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary users.

This tap is intended for through-hole threading at 3/8-16 UNC in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, cast iron, high-nickel alloy, and titanium. It is appropriate for both shop production work and field maintenance threading where a 3/8-16 fastener thread is required. The plug chamfer style requires a pre-drilled through hole and is not intended for blind-hole applications where a bottoming tap would be needed.

Key Features

• Spiral point geometry pushes chips forward, improving chip flow in through-hole tapping
• TiN coating reduces friction and increases surface hardness for extended tool life
• Vanadium high speed steel substrate handles a broad range of workpiece materials
• Plug chamfer provides gradual thread lead-in, reducing tap breakage risk
• H11 thread limit ensures correct tolerance fit for standard 3/8-16 UNC fastener assemblies
• Right-hand thread direction compatible with standard threading equipment and tap handles

Compatibility

Designed for through-hole tapping of 3/8-16 UNC threads across aluminum, steel alloys, stainless steel, cast iron, high-nickel alloys, and titanium workpieces per OSG Series 11015.

Installation Notes

Threading operations should be performed with appropriate cutting fluid or tapping compound for the workpiece material. Secure the workpiece firmly before tapping and ensure the tap is started perpendicular to the drilled hole to prevent thread misalignment or tap breakage. Always use a properly sized drill for 3/8-16 UNC before tapping. Reverse the tap periodically during manual operation to break chips and prevent binding.