Osg 10277005 Screw Machine Drill Bit 0.277 in Cobalt Hss

Product Description

The OSG 10277005 is a cobalt high speed steel screw machine length drill bit designed for high-performance drilling in steel and alloy steel workpieces. With a 0.277 inch (letter size J) diameter and a 130-degree drill point angle, this bit delivers aggressive penetration and clean entry in short-reach applications. The R-thinned web reduces thrust and improves centering without sacrificing edge strength. Right-hand spiral flutes evacuate chips efficiently, making this bit well suited for production drilling environments where tool life and hole quality are priorities. Licensed tradespeople and machining professionals install this type of tooling in drill press, CNC, and hand-held power tool setups.

Screw machine length drill bits are shorter than jobber-length bits, providing added rigidity in tight clearance situations or when working in confined machine setups. The OSG 10277005 Series 1000 bit is intended for drilling steel and alloy steel in light manufacturing, maintenance, and fabrication applications. Its straight-cylindrical shank fits standard drill chucks without adapters, and the 1.5 inch flute length accommodates typical shallow-to-moderate depth holes in production drilling contexts.

Key Features

• Cobalt high speed steel construction for improved heat and wear resistance in steel drilling
• 130-degree drill point angle for fast penetration and reduced walking on harder workpieces
• R-thinned web reduces cutting thrust and improves self-centering
• Regular spiral, 2-flute design promotes efficient chip evacuation
• Screw machine length body provides added rigidity over standard jobber-length bits
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed for drilling steel and alloy steel workpieces. Fits any standard drill chuck or collet accepting a straight-cylindrical shank at the specified 0.277 inch diameter. Diameter tolerance is plus 0 to minus 0.022 mm.

Installation Notes

This tooling is installed and operated by machinists, maintenance technicians, and fabrication professionals. Secure the workpiece firmly before drilling and confirm chuck runout is within acceptable tolerance to preserve hole quality and tool life. Use appropriate cutting fluid or coolant for the workpiece material when possible, even though this bit does not have coolant-through capability. Inspect the cutting edges for wear or chipping before each use and replace the bit if edge integrity is compromised.