Chicago-latrobe 48711 Screw Machine Drill Bit Size 11 Hss

Product Description

The CHICAGO-LATROBE 48711 is a screw machine length drill bit designed for general-purpose drilling in production and repair environments. Manufactured from high-speed steel (HSS) with a bright/uncoated finish, this bit carries a wire size designation of number 11, corresponding to a decimal diameter of 0.1910 inches. The 118-degree standard point angle and web-thinned tip geometry promote accurate entry and reduce walking on initial contact. At 2.25 inches overall length, the screw machine (stub) length format provides added rigidity compared to jobber-length bits, making it well suited for close-tolerance, high-cycle drilling operations. Licensed tradespeople and machinists install this bit in standard drill chucks and screw machine setups.

This bit is intended for drilling cast iron, non-ferrous metals, and steel in both shop and field environments. The shortened flute-to-shank ratio characteristic of screw machine length bits reduces deflection and chatter, which is especially useful when drilling in lathes, drill presses, CNC turret setups, or hand-held pneumatic drills where rigidity and repeatability matter. The two-spiral flutes with regular helix and parallel web configuration promote consistent chip evacuation across the supported workpiece materials.

Key Features

• Wire size number 11 — 0.1910-inch decimal diameter with a tight tolerance of +0.0000 to -0.0007 inches
• High-speed steel construction for general-purpose performance across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned tip for clean entry and reduced thrust force
• Screw machine (stub) length at 2.25 inches OAL for maximum rigidity in high-cycle applications
• Straight-cylindrical shank at 0.1910 inches diameter for compatibility with standard drill chucks
• Bright/uncoated finish — no coating buildup to affect hole size in close-tolerance work

Compatibility

Designed as a general-purpose screw machine length drill bit suitable for use in drill presses, lathes, CNC turrets, and hand-held drills equipped with standard chucks accepting a 0.1910-inch straight-cylindrical shank. Primary workpiece materials include cast iron, non-ferrous metal, and steel per Series 157 specifications.

Installation Notes

This bit is installed by machinists, tool and die technicians, and general maintenance trades. Secure the straight-cylindrical shank fully and concentrically in the chuck before operation to prevent runout and premature wear. Ensure the drilling machine is powered down and locked out before changing bits. Follow applicable shop safety standards and manufacturer speeds-and-feeds recommendations for HSS tooling in the target material.