Osg HP253-3976 Solid Carbide Screw Machine Drill Bit

Product Description

The OSG HP253-3976 is a solid carbide screw machine length drill bit designed for high-performance drilling in ferrous materials. It measures 0.3976 inches (10.10 mm) in diameter with a 140-degree split point and an overall length of 102.00 mm (approximately 4.02 inches). The two-flute spiral design with R-thinned, tapered web geometry reduces thrust and improves chip evacuation at the point. Built-in coolant-through capability supports high-speed, deep-hole operations where heat and chip buildup are concerns. This bit is suited for machine tool applications and is typically run by machinists or tool-and-die professionals on CNC lathes, machining centers, and turret-type screw machines.

This drill bit is engineered for primary use in steel, alloy steel, and cast iron workpieces. The screw machine (stub) length format provides added rigidity compared to jobber-length bits, reducing deflection in close-tolerance drilling operations. The 3xD flute-to-diameter ratio and straight-cylindrical shank with a 12.00 mm (approximately 0.472 inch) shank diameter allow it to seat securely in standard drill chucks and collets. It fits within the 0.3500 to 0.4000 inch (9.50 to 11.00 mm) drill bit size range of the HP253 series.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 140-degree point angle with R-thinned, tapered web for reduced entry thrust
• Coolant-through design supports high-speed and deep-hole drilling operations
• Right-hand cut, two-flute spiral configuration for consistent chip evacuation
• Screw machine (stub) length for improved rigidity and reduced deflection
• Coated finish for extended tool life in steel and alloy steel applications

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces. Compatible with standard drill chucks and collets accepting a 12.00 mm straight-cylindrical shank. Part of the OSG HP253 series covering the 0.3500 to 0.4000 inch diameter range.

Installation Notes

This bit is intended for use by machinists operating CNC or manual machine tools. Ensure the shank is fully seated and properly torqued in the chuck or collet before operation. Set spindle speed and feed rate per the tooling manufacturer recommendations for the specific workpiece material and machine. Inspect the cutting edges and web for wear or chipping before each use, as solid carbide tooling is brittle and can fracture if run in a worn or improperly set up condition.