Osg 859520511 Screw Machine Drill Bit 0.0807 in Hss

Product Description

The OSG 859520511 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high speed steel with a coated finish, this bit features a 0.0807 inch (2.05 mm) diameter, a 130-degree four-facet point, and a right-hand spiral flute configuration. The short screw machine length provides increased rigidity compared to jobber-length bits, reducing deflection and improving hole accuracy in production environments. Web thinning reduces thrust force at the cutting tip, making it well suited for small-diameter work in tough materials.

This drill bit is intended for use in CNC machining centers, drill presses, and screw machines where compact tool length and consistent performance are required. The straight-cylindrical shank with a 3.00 mm diameter seats reliably in standard chucks and collets. Primary workpiece materials include steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate. The 5xD flute-to-diameter ratio supports chip evacuation in short-hole drilling cycles. Machinists, tool-and-die makers, and production drilling operators are the typical end users.

Key Features

• 0.0807 inch (2.05 mm) cutting diameter with a tolerance of +0 to -0.014 mm for tight hole accuracy
• 130-degree four-facet point reduces thrust and improves self-centering on entry
• Web-thinned tapered web lowers cutting resistance on small-diameter work
• High speed steel construction with coated finish for extended tool life
• Screw machine length (44.00 mm overall) provides extra rigidity over jobber-length bits
• Right-hand cut with regular spiral flutes; two-flute design for efficient chip clearance

Compatibility

Designed as an OEM-style replacement or production consumable for screw machine and CNC drilling operations requiring a 2.05 mm straight-shank drill bit in the OSG Series 1100 line. Compatible with workpiece materials including steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate.

Installation Notes

Installation is performed by machinists or tool-room technicians. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the straight-cylindrical shank fully into the chuck or collet and confirm runout before beginning a drilling cycle. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.