Cleveland C14831 Screw Machine Drill Bit 7.5mm Cobalt

Product Description

The CLEVELAND C14831 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including alloy steel and aluminum. Built to a 7.5 mm diameter (0.2953 inches) with a 135-degree split point, it starts on contact without a center punch and reduces walking on hard surfaces. The web-thinned geometry lowers thrust requirements and extends tool life in production environments. At 74 mm (2.91 inches) overall length, the stub-length body provides rigidity and minimizes deflection in short-reach applications. Machinists, tool-and-die workers, and maintenance technicians rely on this bit for repetitive hole-making in alloy and non-ferrous workpieces.

This drill bit is suited for screw machine operations, CNC drill presses, and manual drilling applications where rigidity is critical. The stub length reduces overhang compared to jobber-length bits, making it a practical choice for close-tolerance production work in metals. The straight-cylindrical shank fits standard drill chucks without an adapter. Primary workpiece materials include alloy steel and aluminum, where the M42 cobalt steel construction maintains hardness and edge retention at elevated cutting temperatures.

Key Features

• 7.5 mm (0.2953 inch) diameter with diameter tolerance of +0.0000 to -0.0010 inches for close-fit accuracy
• 135-degree split point for self-centering entry and reduced thrust
• M42 cobalt steel construction retains hardness at high cutting temperatures
• Web-thinned, parallel-web configuration reduces drill pressure and chip packing
• 2-flute regular spiral design promotes chip evacuation in alloy and aluminum
• Meets ASME B94.11M and DIN 1897 standards for dimensional consistency

Compatibility

Designed as a heavy-duty screw machine length drill bit compatible with standard drill chucks accepting a 0.2953-inch straight-cylindrical shank. Suitable for Series 2133 applications targeting alloy steel and aluminum workpieces within the 6.50 to 8.00 mm diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with metalcutting operations. Secure the shank fully in a calibrated chuck and verify runout before beginning a cut. Always wear appropriate PPE including eye protection when operating drill equipment, and ensure the workpiece is properly fixtured or clamped before drilling. Follow the machine manufacturer's recommended speeds and feeds for cobalt tooling in the target workpiece material.