Guhring 9039030030000 Spiral Flute Tap M3 X 0.50 Cobalt

Product Description

The GUHRING 9039030030000 is a cobalt spiral flute tap designed for blind hole threading in metric coarse applications. It cuts an M3 x 0.50 thread to a 6H class of fit with a D3 thread limit, delivering consistent tolerance in production and repair environments. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard plug tap. With a 40-degree helix angle and fast flute style, it evacuates chips efficiently during cutting. Machinists and tool-and-die technicians are the primary users of this tap in both CNC and manual tapping operations.

This tap is suited for blind hole threading in a range of materials including aluminum and other non-ferrous metals, gray cast iron, malleable and spheroidal iron, and steel. The right-hand flute and right-hand thread geometry make it a conventional choice for standard machine tapping setups. At 1.941 inches overall length with a 0.141-inch shank diameter, it fits standard tap holders and quick-change tapping heads used in machining centers and drill presses. Series 3903 is GUHRING's dedicated spiral flute tap line for these material groups.

Key Features

• M3 x 0.50 metric coarse thread, 6H class of fit with D3 thread limit for tight tolerance control
• Modified bottoming chamfer for threading near the base of blind holes
• 40-degree helix angle with fast flute style for effective chip evacuation
• Cobalt construction provides hardness and heat resistance for steel and cast iron applications
• Bright/uncoated finish — no coating buildup to affect thread tolerance in close-tolerance work
• Right-hand thread and right-hand flute for standard tapping direction

Compatibility

Compatible with aluminum and other non-ferrous metals, gray cast iron, malleable and spheroidal iron, and steel. Designed for blind hole threading applications using standard tap holders sized for a 0.141-inch shank diameter.

Installation Notes

Install in a properly aligned tap holder or quick-change tapping head to prevent tap breakage on this small diameter. Power down or stop spindle rotation fully before loading or removing the tap. Use appropriate cutting fluid for the workpiece material — particularly important when tapping steel or cast iron. Follow shop safety practices and machine-specific tooling guidelines when setting depth stops for blind hole applications.