Osg 10191005 Screw Machine Drill Bit No. 11 Cobalt Hss

Product Description

The OSG 10191005 is a screw machine length (stub length) drill bit designed for high-performance drilling in steel and alloy steel. It is ground from cobalt high speed steel and coated with titanium nitride (TiN) for extended tool life and heat resistance. The bit features a 130-degree point angle with R-thinned web geometry, which reduces thrust force and improves chip evacuation at the cutting tip. Overall length is 3 inches with a flute length of 1-3/16 inches, making it well suited for use in tight spaces, turret lathes, screw machines, and CNC drilling operations. Diameter is 0.191 inches (No. 11 wire size) with a 0.25-inch straight cylindrical shank.

This drill bit is intended for production drilling environments where short, rigid tooling is required. It is commonly used in metalworking shops, maintenance and repair operations, and manufacturing cells drilling mild steel, carbon steel, and alloy steel workpieces. The screw machine length configuration minimizes deflection, making it a reliable choice for repeat-hole drilling on CNC machining centers, drill presses, and manual turret equipment. The 2-flute spiral design with tapered web and 3xD flute-to-diameter ratio supports consistent chip clearing in ferrous materials.

Key Features

• Cobalt high speed steel construction for improved heat and wear resistance over standard HSS
• Titanium nitride (TiN) coating extends cutting edge life in steel and alloy steel applications
• 130-degree point angle with R-thinned web reduces entry thrust and walking
• Screw machine (stub) length body increases rigidity and reduces deflection
• Straight cylindrical shank fits standard drill chucks and collets
• Right-hand cut, 2-flute spiral design with tapered web for consistent chip flow

Compatibility

Designed as an OEM-style replacement or production tooling option for screw machine length drill bit applications in metalworking operations requiring a No. 11 wire size (0.191 inch) cobalt HSS drill with a 0.25-inch straight shank.

Installation Notes

Installation is performed by machinists and tooling technicians in machine shop or production environments. Secure the shank fully in the chuck or collet before operation and verify runout before beginning production runs. Ensure spindle speed and feed rate are set according to established speeds-and-feeds tables for cobalt HSS tooling in the target material. Inspect the cutting edges for wear regularly; do not use a chipped or worn bit, as this increases the risk of workpiece damage and tool breakage.