Osg 1405010408 Thread Forming Tap 3/8-16 Unc Bottoming

Product Description

The OSG 1405010408 is a bottoming-style thread forming tap in the EXOTAP VP-NRT series, designed for cold-forming internal threads without cutting. It runs on 3/8-16 UNC thread geometry and is manufactured from powdered metal high-speed steel with a TiCN (titanium carbonitride) coating for extended tool life in demanding materials. The bottoming chamfer — 1 to 1.5 thread pitch — allows threading close to the bottom of a blind hole. With an overall length of 2.9380 inches and a thread limit of H5, this tap is suited for precision threading to a Class 3B fit in production and maintenance applications.

This tap is built for blind hole threading across a broad range of workpiece materials, including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The thread forming (chipless) design makes it especially effective in ductile materials where chip evacuation is a concern. It is a right-hand tap used in CNC machining centers, drill presses, and tapping machines in industrial manufacturing, tool and die, and general machining operations. Coolant-through is not supported on this model.

Key Features

• Thread forming (chipless) design eliminates chip evacuation issues in blind holes
• Bottoming chamfer (1 to 1.5P) enables threading near the base of a blind hole
• Powdered metal high-speed steel construction for improved toughness and wear resistance
• TiCN coating reduces friction and extends tool life in ferrous and non-ferrous materials
• Class 3B fit, H5 thread limit for tight-tolerance applications
• Right-hand, 3/8-16 UNC thread geometry

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring 3/8-16 UNC internal threads to a Class 3B fit.

Installation Notes

This tap is installed and operated by machinists using CNC equipment, drill presses, or dedicated tapping machines. Power down and lock out all equipment before changing or inspecting tooling. Use the correct tap holder or collet to maintain alignment and prevent tap breakage — misalignment is a primary cause of failure with forming taps. Apply appropriate tapping fluid or cutting oil for the workpiece material; thread forming generates higher torque than cutting taps, so torque capacity of the tapping machine or holder should be verified against the application before running production.