Osg 2963600 Spiral Flute Tap M6x1.00 Metric Coarse 6H

Product Description

The OSG 2963600 is a spiral flute tap designed for cutting internal M6x1.00 metric coarse threads in through-hole and blind-hole applications. Built from vanadium high-speed steel with a bright uncoated finish, this tap runs a 50-degree helix angle that efficiently evacuates chips upward out of the hole — a critical advantage when tapping ductile materials like aluminum. The modified bottoming chamfer allows threading close to the bottom of a blind bore while still providing enough lead-in to start straight. The 6H class of fit delivers a standard metric thread tolerance suitable for most fastener and assembly applications. Overall length is 2.5 inches with a shank diameter of 0.255 inches.

This tap is specifically suited for aluminum and other non-ferrous or light-alloy workpieces where chip packing is a common cause of tap breakage. The spiral flute geometry pulls chips back through the flutes rather than pushing them ahead of the cutting edge, reducing the risk of re-cutting and tool failure. Machinists, toolroom operators, and production floor technicians use this tap in CNC machining centers, knee mills, and drill presses equipped with tapping attachments. The 2-flute design is well matched to softer materials where chip volume per tooth is high. Series 296 from OSG.

Key Features

• M6x1.00 metric coarse thread, 6H class of fit for standard metric tolerance
• 50-degree helix angle promotes upward chip evacuation — optimized for aluminum
• Modified bottoming chamfer enables threading near the base of blind bores
• Vanadium high-speed steel construction for wear resistance in abrasive cuts
• Bright uncoated finish — no coating to interfere with close-tolerance thread geometry
• Right-hand thread, right-hand flute direction for standard spindle rotation

Compatibility

Designed for use in aluminum workpieces as an M6x1.00 metric coarse spiral flute tap with a D5 thread limit and 6H class of fit. Compatible with standard tap holders and tapping chucks accepting a 0.255-inch round shank.

Installation Notes

Secure the tap in a floating or rigid tapping holder sized for the 0.255-inch shank before use. Ensure the drill press, mill, or machining center spindle is powered down and the workpiece is firmly fixtured before loading the tap. Apply a cutting fluid appropriate for aluminum to extend tool life and maintain thread finish. Do not exceed the recommended speed range for high-speed steel taps in the material being machined, and back the tap out periodically in hand-tapping operations to break and clear chips.