Osg 7005000 Spiral Point Sti Tap 5-40 Unc 2 Flute Hss

Product Description

The OSG 7005000 is a spiral point STI tap designed for threading 5-40 UNC screw thread inserts in ferrous and non-ferrous workpieces. The spiral point geometry pushes chips forward ahead of the cutting action, making it well suited for through-hole tapping applications where chip evacuation matters. Built from high-speed steel with a bright uncoated finish, this tap delivers reliable performance in general-purpose machine shop and maintenance environments. It features a plug chamfer for gradual thread engagement, 2 flutes, an H2 thread limit for close tolerance fits, and an overall length of 1-15/16 inches with a thread length of 5/8 inches. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary installers.

This tap is intended for use in production and maintenance tapping operations where a 5-40 UNC thread form is required for helical insert installation. The STI designation means it cuts an oversized thread profile specifically sized to accept a coil-type screw thread insert, restoring or reinforcing threaded holes in aluminum, cast iron, steel, and similar materials. It is appropriate for both manual and machine tapping setups in light manufacturing, MRO, and toolroom settings.

Key Features

• Spiral point geometry pushes chips forward for efficient through-hole tapping
• STI thread form cuts oversized profile for coil-type screw thread insert installation
• High-speed steel construction provides durability in general-purpose tapping applications
• Plug chamfer with H2 thread limit for consistent, close-tolerance thread fits
• Bright uncoated finish suitable for use with standard cutting fluids
• Compact overall length of 1-15/16 inches accommodates restricted-access tapping setups

Compatibility

Designed as an OEM-style production tap for use in applications requiring a 5-40 UNC STI thread profile sized for standard coil-type screw thread insert installation.

Installation Notes

Tapping operations should be performed by a qualified machinist or toolroom technician using a properly aligned tap handle, tapping head, or CNC machine with rigid or floating tap holder. Apply an appropriate cutting fluid for the workpiece material before and during tapping to reduce heat and tool wear. Secure the workpiece firmly before starting the tap to prevent misalignment and thread damage. Never reverse a tap under power without confirming the setup allows for proper chip clearance.