Precision Twist Drill 5995964 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995964 is a cobalt screw machine length drill bit engineered for drilling into hard and abrasive materials where standard high-speed steel bits fall short. Sized at 31/64 inch (0.4844 inch decimal) in diameter with an overall length of 3-11/16 inches and a flute length of 2-3/16 inches, this bit is built for stub-length applications that demand rigidity and reduced deflection. The 135-degree split point promotes fast penetration and self-centering without a center punch. Right-hand cut with a straight cylindrical shank, it is part of the M40CO heavy-duty series rated to ANSI standards. Machinists, tool-and-die technicians, and maintenance professionals install this bit in drill presses, CNC machines, and hand-held power drills.

This bit is suited for production and maintenance drilling in hard ferrous metals, stainless steel, high-nickel alloys, and other tough workpiece materials where heat buildup shortens tool life. The screw machine length geometry provides extra stiffness compared to jobber-length bits, making it a practical choice for short-reach holes in tight setups or fixture work. The M40CO cobalt material grade retains hardness at elevated cutting temperatures, extending service intervals in high-cycle drilling operations. It is sold individually and is appropriate for both shop floor and field maintenance use.

Key Features

• Cobalt construction (M40CO material grade) for high-heat resistance in hard-material drilling
• 135-degree split point for self-centering and reduced thrust force
• Screw machine length design provides superior rigidity and minimizes bit deflection
• Web-thinned, tapered web configuration reduces cutting resistance
• Right-hand cut with straight cylindrical shank for broad chuck compatibility
• Meets ANSI standards; rated heavy duty for high-performance production use

Compatibility

Designed as a direct-fit screw machine length drill bit for use in drill presses, CNC drilling stations, and standard chucks accepting a 0.4844-inch straight cylindrical shank. Rated for primary use in hard workpiece materials per M40CO series specifications.

Installation Notes

Installation and operation should be performed by a qualified machinist or maintenance technician familiar with cutting tool safety. Secure the shank fully in the chuck and verify runout before beginning a cut. Use appropriate cutting fluid or coolant when drilling hard metals to manage heat, even though this bit does not support coolant-through delivery. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.