Sgs 51330 Screw Machine Drill Bit 1/8 in Solid Carbide

Product Description

The SGS 51330 is a screw machine length drill bit designed for precision hole-making in hard and abrasive materials. Built from solid carbide with a Ti-NAMITE-A AlTiN (aluminum titanium nitride) coating, it delivers high heat and wear resistance in demanding cutting applications. The bit features a 145-degree notched point angle and web-thinned, tapered web construction for improved penetration and reduced thrust. With a 2-flute regular spiral configuration and a 0.1250-inch (1/8 inch) diameter, this bit suits machinists and fabricators working in alloy steels and titanium where tool life and dimensional accuracy are critical.

This drill bit is intended for use in CNC machining centers, drill presses, and screw machine setups where a short, rigid cutting tool is needed to maintain tight tolerances. Its screw machine length — 2.5 inches overall — provides added stiffness compared to jobber-length bits, making it well-suited for high-speed production drilling in alloy and titanium workpieces. The straight shank and 0.2500-inch shank diameter allow standard collet or chuck mounting. It is typically installed and operated by machinists, tool-and-die professionals, and precision fabricators.

Key Features

• Solid carbide construction with AlTiN (Ti-NAMITE-A) coating for extended tool life in hard materials
• 145-degree notched point angle reduces walking and improves self-centering on entry
• Web-thinned, tapered web lowers thrust requirements and aids chip evacuation
• Screw machine length (2.5 inches OAL) provides rigidity for close-tolerance drilling
• 2-flute regular spiral design with 3xD flute-to-diameter ratio supports efficient chip flow
• Right-hand cut with straight shank for standard collet or drill chuck compatibility

Compatibility

Designed as a screw machine length replacement or production drill for use in alloy steel and titanium workpieces. SGS Series 135 designation. Consult tooling specifications and machine RPM/feed charts for proper application in your equipment.

Installation Notes

This bit is installed by machinists in collet chucks or keyless drill chucks rated for the 0.2500-inch straight shank diameter. Ensure the machine spindle is fully stopped and locked before changing tooling. Use cutting fluid or coolant appropriate for the workpiece material when drilling titanium or high-alloy steels, even though this bit does not feature through-coolant capability. Verify spindle speed and feed rate against carbide tooling recommendations before running production cuts.