Osg 1101601903 Spiral Point Tap 1/2-13 Unc Nitride Hss

Product Description

The OSG 1101601903 is a spiral point plug tap designed for producing internal threads in through-hole applications. Built from Vanadium High Speed Steel (HSS-E) with a nitride coating, this tap cuts 1/2-13 UNC threads to a 3B class of fit with an H3 thread limit. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole tapping where chip evacuation matters. With a right-hand thread direction and plug chamfer, it is a standard production choice for shops running threaded fastener holes in volume. Licensed machinists and tool-and-die technicians are the primary users.

This tap is optimized for aluminum and cast aluminum workpieces, where HSS-E and nitride coatings perform reliably without the cost of carbide tooling. It fits the OSG Series 11016 product family. Typical install scenarios include CNC machining centers, knee mills, and drill-press tapping setups where through-holes require a clean, dimensionally consistent 1/2-13 UNC thread. No coolant-through feature is present, so flood or mist coolant delivery at the spindle is the standard approach for production runs in aluminum.

Key Features

• Spiral point geometry advances chips forward, keeping the flutes clear in through-hole operations
• Vanadium High Speed Steel (HSS-E) construction provides toughness and wear resistance beyond standard M2 HSS
• Nitride coating reduces friction and improves tool life in non-ferrous and light ferrous materials
• H3 thread limit and 3B class of fit produce threads within standard tolerance for most general-purpose fastener assemblies
• Right-hand cut, plug chamfer for straightforward entry in pre-drilled through holes
• Non-oversize, uninterrupted thread form for clean, consistent thread profile

Compatibility

Optimized for tapping aluminum and cast aluminum. Cuts 1/2-13 UNC right-hand threads to 3B class of fit. Part of OSG Series 11016.

Installation Notes

This tap is installed and operated by machinists using CNC machining centers, manual mills, or tapping machines. Ensure the workpiece is securely fixtured and the pre-drill hole diameter matches the recommended tap drill size for 1/2-13 UNC before beginning the operation. Use appropriate cutting fluid or flood coolant directed at the tap to prevent galling, particularly in aluminum. Inspect the tap for wear or chipping before each use and never force a worn tap to prevent breakage in the workpiece.