Precision Twist Drill 5998817 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998817 is a screw machine length drill bit designed for high-performance drilling in metal and other hard materials. It features a 0.166 inch (Wire Size 19) diameter, a 118-degree standard point angle, and a web-thinned, tapered-web construction that reduces thrust and improves chip evacuation. Made from high speed steel with a bright/uncoated finish, this bit delivers consistent cutting performance in general-purpose and high-performance applications. The straight-cylindrical shank seats securely in standard drill chucks. It is sized to the ANSI standard and sold individually per package.

This drill bit is suited for use in screw machine operations and bench drilling applications where a short, rigid bit is required for accurate hole placement. The screw machine length format reduces deflection compared to jobber-length bits, making it a preferred choice when drilling in tight setups or when hole position tolerance is critical. The right-hand spiral flute with a 2.5xD flute-to-diameter ratio handles typical metal-cutting operations efficiently. Primary workpiece material rating includes titanium, indicating suitability for demanding alloy work as well as general ferrous and non-ferrous materials.

Key Features

• Wire Size 19 diameter at 0.166 inches for precise hole sizing
• 118-degree standard point angle with web-thinned, tapered-web design reduces entry thrust
• High speed steel construction rated for high-performance applications including titanium
• Screw machine length for increased rigidity and reduced deflection during drilling
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• ANSI-compliant Series R41 design with bright/uncoated finish

Compatibility

Designed as an OEM-style replacement or direct substitute for screw machine length drill bits in Wire Size 19 (0.1660 inches) within the 0.1500 to 0.2000 inch drill bit size range, conforming to ANSI standards for straight-shank screw machine drill bits.

Installation Notes

This bit is installed by machinists and trade professionals using standard drill chucks compatible with straight-cylindrical shanks. Secure the shank fully in the chuck before operation to prevent runout. Always wear appropriate eye protection and follow shop safety protocols when drilling. Ensure the workpiece is firmly clamped and the drill press or machine spindle speed is set appropriately for the workpiece material and bit diameter.