Osg 8595305 Screw Machine Drill Bit 0.12 in Hss

Product Description

The OSG 8595305 is a screw machine length drill bit designed for high-performance drilling in metalworking applications. Built from high speed steel with a coated finish, it features a 0.12 inch (wire size #31, 3.05 mm) diameter, a 130-degree faceted drill point, and a right-hand spiral flute configuration. The shortened screw machine length format improves rigidity and reduces deflection compared to jobber-length bits, making it well suited for precision hole work in production environments. A tapered web with web thinning reduces thrust requirements at the point. This bit is sold and installed by machinists, tool-and-die professionals, and maintenance technicians.

The OSG 8595305 is intended for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. The screw machine length makes it a practical choice for drill press, turret lathe, CNC machining center, and hand-held power tool operations where a shorter, stiffer bit is preferred. The Series 1100 designation places it in OSG's high-performance category, and the 5xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes. Coolant-through capability is not included in this design.

Key Features

• High speed steel construction with coated finish for wear resistance on ferrous and non-ferrous materials
• 130-degree faceted point angle for reduced thrust and clean entry on steel and stainless steel
• Web-thinned, tapered web reduces cutting force at the drill tip
• Screw machine (stub) length improves rigidity and minimizes runout in tight setups
• Right-hand cut, regular spiral flute promotes consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement and general-purpose screw machine drill bit suitable for standard drill chucks and toolholders accepting a straight-cylindrical shank in the 0.12 inch diameter range.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck or collet toolholder. Confirm the chuck is fully tightened and the shank is fully seated before operation. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, particularly when drilling stainless steel. Inspect the cutting edges for wear or chipping before each use and replace the bit if point geometry is compromised.