Osg 7007100 Spiral Point Sti Tap 6-40 Unf 2 Flutes Hss

Product Description

The OSG 7007100 is a spiral point STI tap designed for cutting 6-40 UNF threads in a plug chamfer configuration. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers reliable thread-forming performance in ferrous and non-ferrous materials. The plug chamfer provides a gradual cutting action suited for through-hole applications. With an overall length of 2 inches and a thread length of 11/16 inches, this tap is sized for small-diameter precision threading work. Machinists, tool and die makers, and maintenance technicians working with fine-pitch fastener threads will find this tap appropriate for bench, drill press, and CNC tapping operations.

This tap is used in applications requiring STI (Screw Thread Insert) thread profiles at the 6-40 UNF specification, producing an oversized internal thread that accepts a helical wire insert. Common use cases include thread repair on stripped holes and new construction where Heli-Coil or equivalent insert systems are being installed. The 2-flute design and spiral point geometry push chips ahead of the cut, making this configuration well suited for through-hole tapping in production and maintenance environments.

Key Features

• STI thread profile sized for 6-40 UNF helical wire inserts
• Plug chamfer provides gradual cutting entry for through-hole applications
• High-speed steel construction offers toughness across a range of workpiece materials
• Spiral point geometry pushes chips forward, reducing chip packing in through-hole work
• Bright, uncoated finish allows direct visual inspection of tap condition
• H2 thread limit provides controlled pitch diameter tolerance for consistent insert fit

Compatibility

Designed for use in through-hole tapping operations requiring a 6-40 UNF STI thread profile, compatible with standard helical wire thread insert systems at this thread size and pitch.

Installation Notes

Threading operations with this tap should be performed by qualified machinists or maintenance technicians familiar with tap alignment and feed rate requirements. Use appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Ensure the tap is driven square to the workpiece to avoid thread misalignment or tap breakage. Follow the insert manufacturer instructions for the matching drill size required prior to tapping.