Osg HP253-4528 Screw Machine Drill Bit 11.50mm Carbide

Product Description

The OSG HP253-4528 is a solid carbide screw machine length drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. At 11.50 mm in diameter with a 140-degree point angle, it is designed to enter material cleanly and resist walking on flat or curved workpiece surfaces. The R-thinned point reduces thrust force at entry, while the EgiAs coating extends tool life in abrasive ferrous materials. With an overall length of 102 mm and a 55 mm flute length, this stub-length geometry provides rigidity in CNC machining centers, drill presses, and automated production equipment. Coolant-through capability supports high-speed metal removal with improved chip evacuation and thermal control.

This drill bit suits production machining environments where repeatability and tool life are priorities. The straight-cylindrical shank at 12.00 mm diameter seats securely in standard drill chucks and collet holders. Its 3xD flute-to-diameter ratio makes it well-suited for through-hole and blind-hole applications in ferrous workpieces across job shop and production floor settings. Machinists and tooling specialists working with CNC lathes, machining centers, or manual drill presses will find this bit consistent with demanding cycle times in steel and cast iron work.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• EgiAs coating extends tool life and reduces friction in steel and alloy steel
• 140-degree point angle with R-thinned web minimizes entry thrust and reduces drill walk
• Coolant-through design supports chip evacuation and heat management at depth
• Screw machine (stub) length geometry improves rigidity over jobber-length alternatives
• Regular spiral, two-flute configuration for efficient chip removal in right-hand cutting

Compatibility

Designed for use in steel, alloy steel, and cast iron workpieces. Compatible with standard straight-cylindrical shank chucks and collet systems accepting a 12.00 mm shank. Fits within the HP253 series drill bit family from OSG.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with CNC or manual drilling equipment. Ensure the spindle is fully stopped and the machine is locked out before mounting or removing the bit from the holder. Verify chuck or collet runout is within acceptable tolerance before beginning a cycle, as excessive runout accelerates carbide wear. Coolant lines should be confirmed open and flowing before engaging the drill in coolant-through mode.