Osg 31440108 Spiral Point Sti Tap 2-56 Unc Plug

Product Description

The OSG 31440108 is a spiral point STI tap designed for cutting 2-56 UNC threads in a screw thread insert (STI) application. It features a plug chamfer for progressive thread engagement and is manufactured from powdered metal for consistent hardness and wear resistance. The V finish reduces surface friction during cutting. With 2 flutes and a thread limit of H2, this tap is suited for producing accurate 2B class of fit threads in both through-hole and shallow blind-hole configurations. It carries an overall length of 1.882 inches and a thread length of 0.562 inches. Machinists, tool and die makers, and maintenance technicians use this tap for repair and production work on fine-threaded fastener applications.

This tap is used in metalworking operations where 2-56 UNC STI threads are required. Typical applications include tapping operations in ferrous and non-ferrous metals for thread insert preparation. The spiral point geometry pushes chips forward ahead of the tap, making it well suited for through-hole tapping on CNC machines, drill presses, and manual tapping operations. It is part of the OSG Series 314Ti product line and is packaged individually.

Key Features

• 2-56 UNC thread size for fine-pitch, small-diameter thread applications
• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• Plug chamfer provides gradual thread engagement for controlled cutting action
• Powdered metal construction delivers consistent hardness and extended tool life
• V finish reduces friction and improves chip flow during the cut
• H2 thread limit and 2B class of fit for precise thread tolerance control

Compatibility

Designed as an STI-style tap for 2-56 UNC thread insert preparation in standard through-hole metalworking applications.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a standard tap wrench, tapping head, or CNC rigid tapping setup. Ensure the workpiece is securely fixtured and the spindle is properly aligned before beginning the tapping operation. Apply an appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Inspect the tap for wear or chipping before each use and replace if cutting performance degrades.