Osg 61581 Screw Machine Drill Bit 8.10mm Tin Hss

Product Description

The OSG 61581 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during cutting. The bit measures 8.10 mm in diameter with a 120-degree faceted point angle, a web-thinned tip geometry for easier penetration, and a two-flute spiral configuration for efficient chip evacuation. Overall length is 87 mm (3.4252 inches), with a flute length of 37 mm. The straight-cylindrical shank measures 10.00 mm in diameter. This bit is intended for use by machinists and tool-and-die professionals working in production or job-shop environments.

The OSG 61581 is suited for drilling into steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate. Its screw machine length profile — shorter and more rigid than jobber-length bits — makes it well-matched for drill press work, CNC machining centers, and turret lathes where reduced stick-out and increased rigidity improve hole accuracy. The Series 1100 designation indicates a high-performance grade optimized for demanding material removal in repetitive production cycles.

Key Features

• 8.10 mm cutting diameter with a tolerance of +0 to -0.022 mm for precise hole sizing
• TiN coating reduces friction and extends cutting tool life compared to uncoated HSS
• 120-degree faceted point with web-thinned, tapered web configuration for reduced thrust and easier entry
• Two-flute regular spiral design promotes efficient chip removal
• Screw machine length (87 mm OAL) provides increased rigidity over jobber-length alternatives
• Right-hand cutting direction; straight-cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Fits standard drill chucks and collets accepting a 10.00 mm straight-cylindrical shank. Suitable for use in drill presses, CNC machining centers, and turret lathes.

Installation Notes

Installation and tool changes should be performed with the machine fully de-energized and the spindle at a complete stop. Secure the straight-cylindrical shank firmly in a compatible drill chuck or collet to the manufacturer-specified holding depth before operation. Verify spindle speed and feed rate are appropriate for the workpiece material and bit diameter before starting the cut. Follow applicable OSHA machine guarding and personal protective equipment requirements when operating drill presses or machining centers.