Sgs 56428 Solid Carbide Screw Machine Drill Bit 1/2 in

Product Description

The SGS 56428 is a solid carbide screw machine length drill bit designed for high-performance drilling in a wide range of workpiece materials. It measures 0.5000 inches in diameter with an overall length of 4.2126 inches and features a 137-degree drill point angle for aggressive, centered starts. The carbide substrate is micrograin grade, and the bit carries a proprietary coated finish to support tool life and chip evacuation. With a right-hand cut, regular spiral flute geometry, and web-thinned point, this bit is built for production-level performance in machine shop, manufacturing, and industrial maintenance environments. Two flutes and four margins maintain bore accuracy and surface finish through the full cut depth of 2.3622 inches.

This drill bit is suited for use in CNC machining centers, drill presses, and screw machine setups where short, rigid tooling is required. The screw machine length profile reduces overhang and deflection compared to jobber-length bits, making it preferred in tight-clearance fixtures and high-feed applications. The straight cylindrical shank seats directly into standard drill chucks or collets. Coolant-through capability allows internal delivery of cutting fluid, extending tool life and supporting chip removal when drilling deep holes in hard or abrasive materials. The Series 142P design follows DIN 6537 specification.

Key Features

• Solid carbide micrograin construction for hardness and wear resistance in demanding materials
• 137-degree drill point angle with web-thinned tip for reduced thrust and accurate entry
• Coolant-through design supports internal fluid delivery for heat management and chip evacuation
• Screw machine length (4.2126 inches OAL) provides rigidity and reduces deflection in machine setups
• Four-margin geometry maintains bore straightness and dimensional accuracy
• Right-hand cut with regular spiral flute; diameter tolerance held to +0.00028 to +0.00098 inches
• Conforms to DIN 6537 specification for consistent interchangeability

Compatibility

Designed for use with standard drill chucks and collet holders accepting a 14.0005 mm straight cylindrical shank; compatible with CNC machining centers, drill presses, and screw machines requiring a 0.5000-inch diameter, screw machine length carbide drill per DIN 6537.

Installation Notes

Installation and operation should be performed by qualified machinists or tool-and-die technicians familiar with carbide cutting tools. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from any holder. Carbide tooling is brittle and should not be dropped or used to pry; inspect the cutting edges and flutes for chips or cracks before each use. Verify coolant-through connections are secure and flow is confirmed before initiating a drilling cycle.