Osg 1405004308 Thread Forming Tap 8-32 Unc Bottoming Ticn

Product Description

The OSG 1405004308 is a bottoming-style thread forming tap in the EXOTAP VP-NRT series, designed for cold-forming internal threads without cutting. Made from powdered metal high-speed steel (PM-HSS) with a TiCN coating and an H6 thread limit, it produces clean, strong threads in blind holes by displacing material rather than removing chips. The 8-32 UNC right-hand thread configuration and 1 to 1.5 chamfered thread engagement make it well-suited for close-tolerance work where full thread depth near the bottom of a hole is required. Machinists and toolmakers working in production or maintenance environments rely on this tap for its durability and consistent thread quality.

This tap is intended for blind hole threading in a range of workpiece materials, including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The thread forming process eliminates chips entirely, making it especially useful in confined setups or applications where chip evacuation is difficult. With an overall length of 2.125 inches and a tapping depth of 0.752 inches, it fits standard tap holders and collet-style tooling used in CNC and manual machining operations.

Key Features

• Bottoming chamfer with 1 to 1.5 chamfered threads for maximum thread depth in blind holes
• Powdered metal high-speed steel construction for improved toughness and wear resistance over conventional HSS
• TiCN coating reduces friction and extends tool life across a broad range of workpiece materials
• H6 thread limit provides tight pitch diameter control for consistent thread fit
• Thread forming (chipless) design eliminates chip management concerns in blind hole applications
• Right-hand, 8-32 UNC thread form compatible with standard inch-series fastener specifications

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Compatible with standard tap holders and collet chucks sized for a 0.168-inch shank diameter.

Installation Notes

Thread forming taps require a specific forming tap drill size, which differs from standard cut tap drill sizes - consult a forming tap drill chart before selecting the pilot hole diameter. Use a tapping fluid or cutting oil appropriate for the workpiece material to reduce forming load and extend tap life. Ensure the spindle is set to a recommended tapping speed for the material and tap size before operation. Inspect the tap for wear or deformation regularly, as overloading a forming tap in hardened materials can cause breakage without visible warning.