Osg 2990801 Spiral Flute Tap M5x0.80 Metric Coarse 6H

Product Description

The OSG 2990801 is a spiral flute tap designed for cutting M5x0.80 metric coarse internal threads in a wide range of ferrous materials. Built from vanadium high-speed steel and finished with a steam oxide coating, this tap handles demanding threading operations where heat and wear resistance matter. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard taper or plug tap. With a 45-degree helix angle and three right-hand flutes, it efficiently evacuates chips upward during the cut, making it well suited for through-hole and shallow blind-hole applications. Overall length is 2-3/8 inches, and the shank diameter is 0.194 inches.

This tap is intended for use in machining and fabrication environments where precise metric threading is required. It targets alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel workpieces. The 6H class of fit produces a standard tolerance thread suitable for most metric fastener assemblies. Machinists, toolroom technicians, and production floor operators working in job shops, maintenance departments, and manufacturing facilities will find this tap appropriate for hand tapping and machine tapping operations at low-to-moderate speeds.

Key Features

• M5x0.80 metric coarse thread form with 6H class of fit for standard tolerance threading
• Modified bottoming chamfer allows threading to within a few threads of a blind hole bottom
• 45-degree helix angle promotes upward chip evacuation, reducing clogging in blind holes
• Vanadium high-speed steel construction provides increased wear resistance over standard HSS
• Steam oxide coating reduces friction and improves lubrication retention during cutting
• Right-hand thread and right-hand flute direction; no coolant-through feature required for typical hand or machine tapping

Compatibility

Rated for use in alloy steel, carbon steel, cast iron, stainless steel, die steel, and hardened steel. Part of OSG Series 299. Thread limit is D4, suitable for standard 6H metric thread fits.

Installation Notes

This tap is installed by machinists or toolroom technicians using a standard tap wrench, tapping head, or CNC machine tapping cycle. Always secure the workpiece and use an appropriate cutting fluid or tapping oil for the material being threaded. For machine tapping, set spindle speed according to the material and tool diameter guidelines for HSS taps. Inspect the tap for wear or chipping before each use and replace if cutting edge condition is degraded.