Osg 61626 Screw Machine Drill Bit 0.4961 in Hss 2 Flute

Product Description

The OSG 61626 is a screw machine length drill bit designed for high-performance metal removal in demanding shop environments. It measures 0.4961 inches (12.60 mm) in diameter with a 120-degree faceted point angle and a web-thinned, tapered web configuration that reduces thrust and improves centering on entry. The two-flute spiral design with regular spiral type promotes efficient chip evacuation. Built from coated high speed steel, this bit handles repeated use in production drilling applications. Overall length is 4.252 inches (108.00 mm), making it shorter and more rigid than jobber-length alternatives. Machinists and tool-and-die professionals typically specify this format for high-cycle work on CNC mills, drill presses, and turret lathes.

The OSG 61626 is suited for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. The screw machine length format provides added rigidity in close-clearance fixtures and short-spindle setups. It falls within the 0.4500 to 0.5000 inch decimal inch drill size range and is part of the OSG Series 1100 lineup. This bit is a right-hand cut tool intended for conventional clockwise-rotation drilling. Coolant-through capability is not included, so conventional flood or mist coolant delivery at the workpiece is the standard approach for production runs.

Key Features

• 0.4961 inch (12.60 mm) diameter with tight tolerance of +0 to -0.027 mm for accurate hole sizing
• 120-degree faceted drill point with web thinning for reduced entry thrust and improved self-centering
• Coated high speed steel construction for extended tool life across steel and aluminum workpieces
• Screw machine length body at 4.252 inches (108.00 mm) overall for increased rigidity in tight setups
• Regular spiral, 2-flute design with 5xD flute-to-diameter ratio for consistent chip clearance
• Straight-cylindrical shank at 12.00 mm diameter for standard collet and chuck compatibility

Compatibility

Designed as an OSG Series 1100 screw machine length drill bit for use in standard straight-shank collets, drill chucks, and toolholders accepting a 12.00 mm cylindrical shank. Primary workpiece materials include steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tool operators familiar with rotating cutting tools and machine tool safety. Ensure the machine spindle is fully stopped and the tool holder is properly torqued before seating the shank. Verify runout at the shank before production drilling to stay within the listed diameter tolerance. Follow applicable shop safety standards and machine manufacturer guidelines for feed rates, speeds, and coolant application when drilling stainless steel or hardened steel workpieces.