Precision Twist Drill 5995987 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995987 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and tough materials. Measuring 0.1562 inches (5/32 inch) in diameter with an overall length of 2-1/16 inches and a 1-inch flute length, this bit is built for stub-length applications where rigidity and accuracy matter. The 135-degree split point reduces walking on entry and lowers thrust requirements. The M40CO-series cobalt construction provides heat and wear resistance beyond standard high-speed steel, making it suited for stainless steel, hardened alloys, and other difficult workpiece materials.

This drill bit is intended for use in screw machine operations, CNC drilling, and bench drilling applications where short-length rigidity is required. The straight-cylindrical shank fits standard drill chucks without modification. The regular spiral flute with a 2.5xD flute-to-diameter ratio promotes chip evacuation in short-bore drilling. It is used by machinists, maintenance technicians, and metalworking tradespeople working with hard ferrous and non-ferrous materials. The web-thinned, tapered web configuration further reduces cutting resistance at the point for cleaner entry into hard stock.

Key Features

• 0.1562 inch (5/32 inch) diameter with 135-degree split point for accurate, low-thrust entry
• M40CO cobalt construction for high heat resistance and extended tool life in hard materials
• Screw machine (stub) length design provides rigidity and reduces deflection
• Web-thinned tapered web lowers cutting resistance at the drill point
• Right-hand cut, regular spiral flute promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI standards for heavy-duty drill bit performance

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for standard drill chucks and screw machine setups accepting a 0.1562 inch straight-cylindrical shank, falling within the M40CO series range of 0.1500 to 0.2000 inch diameter bits.

Installation Notes

This bit is installed by machinists or metalworking technicians in drill press, CNC, or hand-held drilling equipment. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Coolant-through is not supported on this bit; use appropriate cutting fluid applied externally when drilling hard or stainless materials to manage heat buildup. Follow applicable shop safety procedures and machine guarding requirements during use.