Sgs 56421 Screw Machine Drill Bit 3/8 in Solid Carbide

Product Description

The SGS 56421 is a screw machine length drill bit engineered 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 under demanding cutting conditions. The 135-degree split point and web-thinned geometry reduce thrust force and improve centering without a pilot hole. With a 3/8 inch (9.53 mm) diameter and an overall length of 3.5039 inches (89 mm), this bit is sized for compact, rigid setups in CNC machining centers, drill presses, and manual machine work. It ships individually and is suited for machinists, tool-and-die shops, and precision fabricators.

The SGS 56421 is designed for universal workpiece materials, making it a practical choice across ferrous metals, non-ferrous alloys, and engineered materials. The screw machine length profile — shorter than jobber length — provides increased rigidity and reduced deflection, which is especially valuable in high-feed or tight-tolerance applications. Coolant-through capability allows internal coolant delivery directly to the cutting edge, supporting deeper holes and higher spindle speeds without regrinding intervals. This bit fits standard straight-cylindrical shank toolholders with a 0.47 inch shank diameter.

Key Features

• Micrograin solid carbide construction for hardness and wear resistance
• Ti-NAMITE-X coating reduces friction and extends tool life in high-speed applications
• 135-degree standard split point with web thinning for reduced entry thrust and self-centering
• Coolant-through design supports internal coolant delivery at the cutting zone
• 4-margin geometry improves hole straightness and surface finish
• Screw machine length provides added rigidity over jobber-length bits in short-reach setups
• Straight-cylindrical shank compatible with standard collet chucks and drill chucks

Compatibility

Designed for use in CNC machining centers, drill presses, and manual mills with straight-cylindrical shank toolholding systems accepting a 0.47 inch shank diameter. Rated for universal workpiece materials per Series 142P specifications conforming to DIN 6537.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with cutting tool setup. Ensure the spindle is fully stopped and the machine is locked out before inserting or removing the bit from the toolholder. Verify shank seating depth and runout with a dial indicator before commencing a cut. When using coolant-through capability, confirm that coolant pressure and flow rate are within the machine tool's specified range before drilling.