Osg 10161005 Screw Machine Drill Bit 0.161in Cobalt Hss

Product Description

The OSG 10161005 is a screw machine length drill bit designed for high-performance drilling in steel and alloy steel. It measures 0.161 inches in diameter (Wire Size 20, 4.09 mm) with a 130-degree split point and a cobalt high speed steel construction that resists heat buildup during aggressive cuts. The stub-length body keeps the bit rigid and reduces deflection in short-reach applications. A right-hand spiral flute with R-thinned web and tapered web configuration improves chip evacuation and reduces entry thrust. This bit is suited for machinists, tool and die technicians, and industrial maintenance professionals working in production or job-shop environments.

Screw machine length drill bits are the standard choice when rigidity matters more than reach. This bit fits manual drill presses, CNC machining centers, and turret lathes where a short flute-to-diameter ratio minimizes chatter. The 3xD flute-to-diameter ratio and 1-1/16 inch flute length make it effective for shallow holes in ferrous stock, including mild steel, alloy steel, and similar materials. The straight-cylindrical shank seats directly in standard drill chucks and collet holders without adapters.

Key Features

• Cobalt high speed steel construction handles higher cutting temperatures than standard HSS bits
• 130-degree point angle reduces thrust force and centers the drill on entry
• R-thinned web decreases feed pressure and extends bit life on tough ferrous materials
• Tapered web with regular spiral flute promotes efficient chip evacuation
• Straight-cylindrical shank fits standard chucks and collets with no adapter required
• Series 1000 high-performance grade with diameter tolerance of plus 0 to minus 0.018 mm

Compatibility

Designed as a screw machine length replacement drill bit for use in standard drill chucks and collet holders accepting a straight-cylindrical shank. Appropriate for Wire Size 20 applications in the 0.1500 to 0.2000 inch drill bit size range.

Installation Notes

Install and remove drill bits only with the machine powered down and the spindle fully stopped. Secure the straight shank firmly in the chuck or collet to the manufacturer-specified grip depth before operation. Wear appropriate eye protection and follow applicable machine guarding requirements per OSHA 1910.212 when operating drill presses or machining centers. Inspect the cutting edges and web for wear or chipping before each use and replace if the point shows signs of heat discoloration or deformation.