Sgs 51783 Solid Carbide Screw Machine Drill Bit 35/64

Product Description

The SGS 51783 is a solid carbide screw machine length drill bit engineered for high-performance drilling in demanding industrial and metalworking applications. It features a 35/64 inch (0.5469 inch) diameter, a 145-degree split point, and an AlTiN (aluminum titanium nitride) coating that extends tool life in high-heat cutting environments. The overall length is 4.25 inches with a 2-5/16 inch flute length, keeping the tool rigid and reducing deflection at the shorter screw machine profile. The straight cylindrical shank provides consistent seating in standard drill chucks and collet holders. Licensed machinists, tool-and-die technicians, and CNC operators are the primary installers of this bit in production and maintenance environments.

The SGS 51783 is suited for drilling alloy steels and titanium, materials that demand a stiff, short-length bit with aggressive point geometry. The screw machine length (stub) profile reduces overhang and chatter when drilling on machining centers, turret lathes, and drill presses. A maximum drilling depth of 1.875 inches makes it appropriate for through-hole and blind-hole operations where depth requirements fall within that range. The 3xD flute-to-diameter ratio and tapered web configuration with web thinning improve chip evacuation and reduce thrust force in hard materials.

Key Features

• Solid carbide construction for rigidity and heat resistance in hard-material drilling
• AlTiN coating reduces friction and extends tool life in alloy steel and titanium
• 145-degree split point geometry lowers thrust and improves self-centering
• Screw machine (stub) length minimizes deflection in interrupted or deep-reach setups
• Web-thinned, tapered web configuration aids chip flow and reduces cutting force
• Right-hand cut with regular spiral flute; compatible with standard right-hand spindle direction

Compatibility

Designed for use in standard straight-shank drill chucks and collet holders on machining centers, drill presses, and turret lathes. Intended for drilling alloy steels and titanium per Series 135 application guidelines. Verify machine spindle speed and feed rates against carbide tooling recommendations for the specific workpiece material before use.

Installation Notes

Installation of carbide drill bits should be performed by qualified machinists familiar with carbide tooling requirements. Ensure the straight shank is fully seated and properly torqued in the chuck or collet before initiating a cut. Carbide is brittle — avoid side loading, interrupted cuts beyond the tool rating, or excessive runout, as these conditions can cause chipping or fracture. Confirm coolant delivery method and spindle speed are set per the tooling manufacturer's recommendations for the workpiece material before operation.