Sgs 51343 1/4 Inch Solid Carbide Screw Machine Drill Bit

Product Description

The SGS 51343 is a screw machine length drill bit designed for high-performance drilling in demanding materials. Built from solid carbide and coated with AlTiN (Ti-NAMITE-A), it handles alloy steels and titanium where standard high-speed steel bits fail. The 145-degree notched point reduces thrust and improves self-centering on entry. At 3.125 inches overall length with a 1.3125-inch flute length, the screw machine geometry keeps the tool rigid and minimizes deflection in short-reach drilling applications. This is a production-grade tool installed by machinists, tool-and-die makers, and maintenance technicians running CNC or manual drilling operations.

The SGS 51343 is suited for drilling alloy steel and titanium workpieces in production or job-shop environments. The straight shank fits standard drill chucks and collet systems. The web-thinned, tapered web configuration reduces cutting resistance and helps clear chips efficiently. With a 3xD flute-to-diameter ratio and regular spiral flutes, this bit is optimized for short, precise holes rather than deep-bore applications. It is sold individually and is appropriate wherever a 1/4 inch (0.2500 inch, 6.35 mm) diameter carbide bit is specified.

Key Features

• Solid carbide construction for rigidity and extended tool life in hard materials
• AlTiN (Ti-NAMITE-A) coating improves heat resistance and reduces built-up edge in alloy steels and titanium
• 145-degree notched point reduces entry thrust and improves positional accuracy
• Web-thinned tapered web lowers cutting resistance and aids chip evacuation
• Straight shank fits standard chucks and collet toolholders without adapters
• Diameter tolerance held to +0.0002 to +0.0006 inches for consistent hole sizing

Compatibility

Designed for use in alloy steel and titanium workpieces. Compatible with any drill chuck or collet system accepting a 0.2500 inch straight shank. Part of SGS Series 135 screw machine length carbide drill bits.

Installation Notes

Installation and use of carbide drill bits should be performed by qualified machinists or maintenance technicians familiar with speeds, feeds, and workholding practices for carbide tooling. Ensure the spindle and chuck are clean and concentric before seating the shank, as runout accelerates carbide chipping. Carbide is brittle — do not use this bit in a hammer drill or any mode that induces lateral shock. Secure the workpiece firmly; carbide tools do not tolerate chatter or unexpected movement during the cut.