Chicago-latrobe 77657 Carbide Tipped Drill Bit 5/16 in

Product Description

The CHICAGO-LATROBE 77657 is a carbide tipped jobber length drill bit designed for general purpose drilling in demanding materials. Built to CTD Series specifications, it features a 5/16 inch diameter with a 118 degree standard point angle and a web-thinned, tapered web configuration for improved penetration and reduced thrust. The bright uncoated finish makes wear monitoring straightforward in the field. At 4.5 inches overall length with a 3.1875 inch flute length, this bit fits standard jobber length applications across a range of trade drilling tasks.

This drill bit is rated for use in cast iron and non-ferrous metals, making it a practical choice for HVAC, plumbing, and mechanical contractors drilling through structural components, brackets, and fittings. The straight-cylindrical shank accepts standard three-jaw drill chucks. Right-hand spiral flute geometry clears chips efficiently during through-hole and blind-hole work. The general purpose grade suits production and field service environments alike.

Key Features

• Carbide tipped construction for durability in cast iron and non-ferrous metal drilling
• 118 degree standard point angle with web-thinned, tapered web for reduced entry force
• Regular spiral, two-flute design for efficient chip evacuation
• Bright uncoated finish allows easy visual inspection of cutting edge wear
• Straight-cylindrical shank compatible with standard drill chucks
• Diameter tolerance held to +0.0000 to -0.0010 inches for consistent hole sizing

Compatibility

Designed as a general purpose jobber length drill bit suitable for use in cast iron and non-ferrous metal workpieces; fits any standard three-jaw chuck accepting a 5/16 inch straight-cylindrical shank.

Installation Notes

Install and operate this bit using a properly rated drill press, magnetic drill, or handheld power drill with a compatible chuck. Ensure the workpiece is securely clamped before drilling to prevent movement and bit breakage. Carbide tipped tooling is brittle under side-loading or impact — avoid using with hammerdrill or percussion modes. Follow applicable shop safety practices and manufacturer speed-and-feed recommendations for the workpiece material.