Osg 1101601303 Spiral Point Tap 3/8-16 Unc Nitride Hss

Product Description

The OSG 1101601303 is a spiral point tap designed for cutting 3/8-16 UNC right-hand internal threads in through-hole applications. Built from vanadium high-speed steel (HSS-E) with a nitride coating, it offers improved wear resistance and heat tolerance compared to uncoated HSS tooling. The plug chamfer (4-5 thread lead) distributes cutting load progressively, making it well suited for both manual and CNC tapping operations. It carries a 3B class of fit and an H3 thread limit, delivering threads within standard tolerance for general-purpose fastener assemblies. A licensed machinist or toolroom technician is the typical installer.

This tap is rated for use in aluminum and cast aluminum and is a strong choice for production or job-shop environments where consistent thread quality in soft, gummy materials is required. The spiral point design pushes chips forward ahead of the cutting edge rather than packing them into the flute, which reduces chip clogging in through-hole work. With an overall length of 4.12 inches and a thread length of 0.917 inches (1-1/4 inches nominal), it fits standard tap holders and CNC rigid tapping chucks sized for 3/8-inch shank tooling.

Key Features

• 3/8-16 UNC thread form, right-hand, 3B class of fit with H3 thread limit
• Vanadium high-speed steel (HSS-E) construction for elevated toughness and wear life
• Nitride coating reduces friction and extends tool life in aluminum applications
• Spiral point geometry pushes chips forward — optimized for through-hole tapping
• Plug chamfer with 3 flutes for balanced cutting entry and chip load distribution
• No coolant-through requirement; compatible with flood, mist, or cutting oil lubrication

Compatibility

Rated for aluminum and cast aluminum workpiece materials. Designed as a standard plug-style spiral point tap for 3/8-16 UNC through-hole applications using OSG Series 11016 tooling.

Installation Notes

Install in a tap holder or rigid tapping chuck appropriate for the shank diameter before use. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 3/8-16 UNC threads per applicable machining standards. Apply appropriate cutting fluid or tapping oil for aluminum to prevent built-up edge and galling. Inspect the tap for chipping or wear before each use and replace if thread quality falls outside tolerance.