Osg 61587 Screw Machine Drill Bit 8.70mm Tin Hss

Product Description

The OSG 61587 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during cutting operations. The bit measures 8.70 mm in diameter with a 120-degree faceted point, a flute length of 40 mm, and an overall length of 90 mm (3.54 inches). The web-thinned, tapered web configuration reduces thrust and improves chip evacuation. This bit is installed by machinists and toolroom professionals working on production drilling operations requiring consistent hole quality.

The OSG 61587 is suited for drilling steel, stainless steel, aluminum, aluminum alloys, and aluminum silicate workpieces. Its screw machine length profile — shorter than jobber length — provides added rigidity and reduced deflection in drill press, turret lathe, and CNC machining center setups. The 2-flute spiral design handles a wide range of metal cutting scenarios where controlled chip flow and repeatable tolerances are required. It is a strong fit for high-cycle production environments where tool performance and dimensional consistency matter.

Key Features

• 8.70 mm diameter with a diameter tolerance of +0 to -0.022 mm for consistent hole sizing
• TiN coating reduces surface friction and extends cutting edge life
• 120-degree faceted point with web thinning for reduced entry thrust
• Tapered web configuration promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet systems
• Screw machine length body increases rigidity versus jobber-length alternatives

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for machining operations involving steel, stainless steel, aluminum, and aluminum alloy workpieces requiring an 8.70 mm hole diameter.

Installation Notes

Installation of this drill bit should be performed by a qualified machinist or toolroom technician. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation, and verify runout before beginning a production run. Always power down and de-energize the machine spindle before changing tooling. Follow the machine manufacturer's recommended speeds and feeds for the workpiece material being drilled.