Sgs 51356 Screw Machine Drill Bit 25/64 in Carbide Altin

Product Description

The SGS 51356 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 delivers exceptional heat resistance and tool life in alloy steels and titanium. The 145-degree notched point with web thinning reduces entry force and walking on hard surfaces. With a 25/64 inch (0.3906 inch) diameter and an overall length of 3.5 inches, this short-body bit is suited for rigid setups in CNC machining centers, manual mills, and drill presses where rigidity and precision matter. Licensed machinists and tool-and-die professionals rely on this format for close-tolerance hole production.

The SGS 51356 is intended for drilling alloy steels and titanium in both production and job-shop environments. The screw machine length (stub) body improves rigidity over standard-length bits, making it a preferred choice when spindle clearance allows a shorter tool. The 3xD flute-to-diameter ratio and tapered web configuration support efficient chip evacuation in these high-strength materials. It is well-suited to horizontal and vertical machining centers running automated cycles where consistent diameter tolerance is critical.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• AlTiN (Ti-NAMITE-A) coating provides thermal protection during high-speed cutting in alloy and titanium
• 145-degree notched point with web thinning reduces thrust force and self-centers on entry
• Screw machine (stub) length body maximizes rigidity and minimizes deflection
• 2-flute regular spiral design promotes controlled chip evacuation
• Diameter tolerance of +0.0003 to +0.0010 inch supports close-tolerance hole sizing

Compatibility

Designed as a direct-fit replacement or production tooling choice for CNC machining centers, manual mills, and drill presses accepting a 0.5000 inch straight shank; primary workpiece materials listed by the manufacturer are alloy steel and titanium.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the spindle before inserting or removing the bit from the tool holder or chuck. Inspect the straight shank for contamination or damage before seating to ensure concentricity. Follow machine manufacturer guidelines and applicable OSHA standards for rotary cutting tool mounting and RPM limits for carbide tooling.