Osg 1709201 Spiral Flute Tap 6-32 Unc Modified Bottoming

Product Description

The OSG 1709201 is a spiral flute tap designed for cutting 6-32 UNC internal threads in difficult-to-machine materials. Built from powdered metal with a steam oxide coating, this tap runs a right-hand, 3-flute spiral configuration with a 10-degree helix angle. The modified bottoming chamfer lets it thread close to the bottom of a blind hole. At 3.156 inches overall length with a 0.685-inch thread length, it fits standard tap holders used in CNC and manual machine shop applications. The H5 thread limit provides a tighter tolerance fit suited to precision assemblies. Licensed machinists and tool-and-die tradespeople are the primary users.

This tap is rated for stainless steel, hardened steel, titanium, and high-nickel alloys — materials that demand a tough substrate and a coating that reduces galling and built-up edge. The spiral flute design pulls chips up and out of the hole, making it well-suited for blind-hole tapping in interrupted or tough-grain materials. It is commonly used in aerospace, defense, medical device, and industrial equipment manufacturing where 6-32 UNC fasteners appear in tight-tolerance assemblies.

Key Features

• Spiral flute geometry with 10-degree helix angle evacuates chips from blind holes
• Modified bottoming chamfer threads close to hole bottom
• Powdered metal construction handles stainless steel, titanium, hardened steel, and high-nickel alloys
• Steam oxide coating reduces friction and helps resist galling in difficult materials
• H5 thread limit for tight-tolerance 6-32 UNC thread production
• Right-hand thread and right-hand flute direction — standard orientation for most CNC and manual setups

Compatibility

Designed for tapping 6-32 UNC threads in stainless steel, hardened steel, titanium, and high-nickel alloys. Part of the OSG Series 313NI product line.

Installation Notes

Installation requires a tap holder or tapping head matched to the 0.323-inch shank diameter. Always secure the workpiece and verify spindle alignment before tapping. Use cutting fluid or tapping compound appropriate for the workpiece material — particularly important with stainless steel and titanium to prevent work hardening and tap breakage. Inspect the tap for chipping or wear before each use; a damaged tap in hard material will break and may require EDM extraction.