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CHICAGO-LATROBE

Chicago-Latrobe is a manufacturer of precision cutting tools, primarily drill bits, taps, and screw extractors, with a history dating back to the early 20th century. The brand is recognized for producing high-speed steel (HSS) and cobalt tooling that meets National Aerospace Standard (NAS) specifications, particularly NAS 907 Type B. Their product families include aircraft-extension drill bits, jobber-length drill bits, reduced-shank (Silver & Deming) drill bit sets, and spiral-flute screw extractors. These tools are designed for industrial applications requiring tight tolerances, such as aerospace assembly, metal fabrication, and maintenance repair operations. Chicago-Latrobe tools are typically manufactured with black oxide or straw/bronze cobalt finishes, which provide wear resistance and reduce friction during drilling. The 135° split point geometry, common across many of their drill bits, aids in self-centering and reduces thrust requirements, making them suitable for use in portable drills and CNC machines. 3G Electric supplies a broad range of Chicago-Latrobe products, including over 2,900 SKUs, with a focus on NAS-spec aerospace tooling. The inventory includes fractional, number, and letter-sized drill bits, as well as metric sizes, in lengths from jobber to 12-inch extensions. Each tool is specified with clear dimensional data, material composition, and applicable standards, enabling procurement specialists and engineers to select the correct tool for their application. 3G Electric supports global logistics for these products, ensuring availability for maintenance and production environments.

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About CHICAGO-LATROBE

Chicago-Latrobe is a manufacturer of precision cutting tools, primarily drill bits, taps, and screw extractors, with a history dating back to the early 20th century. The brand is recognized for producing high-speed steel (HSS) and cobalt tooling that meets National Aerospace Standard (NAS) specifications, particularly NAS 907 Type B. Their product families include aircraft-extension drill bits, jobber-length drill bits, reduced-shank (Silver & Deming) drill bit sets, and spiral-flute screw extractors. These tools are designed for industrial applications requiring tight tolerances, such as aerospace assembly, metal fabrication, and maintenance repair operations. Chicago-Latrobe tools are typically manufactured with black oxide or straw/bronze cobalt finishes, which provide wear resistance and reduce friction during drilling. The 135° split point geometry, common across many of their drill bits, aids in self-centering and reduces thrust requirements, making them suitable for use in portable drills and CNC machines. 3G Electric supplies a broad range of Chicago-Latrobe products, including over 2,900 SKUs, with a focus on NAS-spec aerospace tooling. The inventory includes fractional, number, and letter-sized drill bits, as well as metric sizes, in lengths from jobber to 12-inch extensions. Each tool is specified with clear dimensional data, material composition, and applicable standards, enabling procurement specialists and engineers to select the correct tool for their application. 3G Electric supports global logistics for these products, ensuring availability for maintenance and production environments.

Common Applications

  • Aerospace assembly — Chicago-Latrobe NAS 907 Type B aircraft-extension drill bits for drilling fastener holes in aluminum and titanium skins.
  • Metal fabrication — Chicago-Latrobe reduced-shank drill bit sets for enlarging holes in structural steel using magnetic drill presses.
  • Maintenance repair — Chicago-Latrobe left-hand cobalt jobber-length drill bits for removing broken bolts in machinery.
  • Tool and die making — Chicago-Latrobe jobber-length drill bit sets with 135° split point for precision hole drilling in hardened steels.
  • Automotive repair — Chicago-Latrobe spiral-flute screw extractors for removing seized fasteners in engine blocks or exhaust systems.
  • General manufacturing — Chicago-Latrobe HSS jobber-length drill bits for production drilling in mild steel and cast iron.

Frequently asked questions

Common questions about CHICAGO-LATROBE from 3G Electric.

What NAS specifications do Chicago-Latrobe drill bits typically meet?

Chicago-Latrobe drill bits commonly meet NAS 907 Type B specifications, which define dimensional and performance requirements for aircraft-quality drill bits. This standard covers tolerances on diameter, point angle, and flute geometry, ensuring compatibility with aerospace assembly processes. The NAS 907 Type B designation is found on many of their jobber-length and aircraft-extension drill bits, including those in HSS and cobalt materials.

What is the difference between Chicago-Latrobe's black oxide and straw/bronze cobalt finishes?

Black oxide is a surface treatment applied to high-speed steel that provides corrosion resistance and reduces friction during drilling. It is common on general-purpose HSS drill bits. Straw/bronze cobalt finish indicates a cobalt alloy (typically M42 or similar) that has been heat-treated to a specific color. Cobalt tools offer higher heat resistance and hardness, making them suitable for drilling harder materials like stainless steel or titanium. The finish is a byproduct of the heat treatment process, not a coating.

Are Chicago-Latrobe reduced-shank drill bit sets suitable for use in magnetic drill presses?

Yes, Chicago-Latrobe reduced-shank (Silver & Deming) drill bit sets, such as the 16-piece set from 17/32" to 1", are designed with a 1/2-inch shank that fits standard drill chucks and magnetic drill press arbors. The reduced shank allows larger diameter bits to be used in machines with limited chuck capacity. These bits are made from high-speed steel with a 118° point angle, suitable for general metal drilling applications.

What is the typical point angle on Chicago-Latrobe aircraft-extension drill bits?

Chicago-Latrobe aircraft-extension drill bits typically feature a 135° split point. This point angle is standard for NAS-spec aerospace tooling because it reduces walking on curved surfaces and requires less thrust than a 118° point. The split point also aids in chip evacuation, which is critical when drilling deep holes in aircraft structures.

Can Chicago-Latrobe screw extractors be used on both metric and imperial fasteners?

Yes, Chicago-Latrobe spiral-flute screw extractors, such as the Size #3 model (MPN 65005), are designed with dual capacity ranges: 5/16" to 7/16" imperial and M8 to M12 metric. The spiral flute design provides a positive grip on broken screws or bolts, and the extractor is made from hardened steel to withstand torsional loads. Always select the extractor size that matches the fastener's minor diameter.

Does 3G Electric supply CHICAGO-LATROBE products?

Yes — 3G Electric (S) Pte. Ltd. supplies CHICAGO-LATROBE products. We stock the CHICAGO-LATROBE catalog and supply genuine factory-original products with full manufacturer warranty and technical support.