Sgs 66457 Screw Machine Drill Bit 7/16 in Solid Carbide

Product Description

The SGS 66457 is a screw machine length drill bit designed for high-performance drilling in a wide range of materials. Built from micrograin solid carbide and coated with Ti-NAMITE-X, it delivers extended tool life and thermal resistance in demanding production environments. The bit measures 7/16 inch (8.70 mm) in diameter with a 135-degree split point that reduces walking and improves hole entry accuracy. Overall length is 3.50 inches (89 mm), keeping the tool rigid and minimizing deflection in short-reach applications. This bit is suited for machinists, tool-and-die professionals, and CNC operators working in metal fabrication and general manufacturing.

The 66457 is built for universal workpiece materials, making it a practical choice across steel, stainless, aluminum, and similar substrates. Its screw machine length profile is ideal for drill press, CNC machining center, and turret lathe setups where a shorter, stiffer drill reduces chatter and improves positional accuracy. Coolant-through capability allows internal coolant delivery directly to the cutting zone, which is particularly valuable in deep-hole production runs or when machining heat-sensitive alloys. The straight-cylindrical shank fits standard drill chucks and collet systems without special toolholding.

Key Features

• Micrograin solid carbide construction for wear resistance and edge retention
• Ti-NAMITE-X coating reduces friction and extends tool life in ferrous and non-ferrous materials
• 135-degree split point with web thinning minimizes thrust force and prevents bit walking
• Coolant-through design delivers coolant directly to the cutting edge for heat management
• 4-margin geometry improves hole roundness and surface finish
• Screw machine length profile increases rigidity and reduces deflection vs. jobber-length bits

Compatibility

Designed as an OEM-style replacement and production drill bit compatible with standard drill chucks and collet toolholding systems accepting a 0.47-inch straight-cylindrical shank. Conforms to DIN 6537 specification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or toolroom personnel familiar with cutting tool setup. Ensure the spindle and workholding are fully secured before engaging the cut. When using coolant-through capability, verify that coolant pressure and flow rate are within the limits of the machine tool and toolholder. Inspect the cutting edge for chipping or wear before each use and replace if edge integrity is compromised.