CHICAGO-LATROBE

Chicago-Latrobe is a manufacturer of high-speed steel (HSS) cutting tools, including drill bits, taps, dies, reamers, and countersinks. The brand is part of Greenfield Industries, a cutting tool manufacturer with operations in the United States. Chicago-Latrobe products are used in metalworking, aerospace, and general industrial applications where precise holemaking and threading are required. The line includes jobber-length drill bits, taper-length drill bits, screw-machine drill bits, and a range of countersinks. Many Chicago-Latrobe drill bits meet NAS (National Aerospace Standard) specifications, such as NAS 907 Type B, which defines requirements for high-speed steel drill bits used in aerospace manufacturing. These bits often feature a 135° split point to reduce thrust and improve hole location accuracy. Coatings such as TiAlN (titanium aluminum nitride) are applied to extend tool life in demanding materials. Countersinks from Chicago-Latrobe are available in single-flute and multi-flute designs, with angles including 82° and 90° for flat-head screw applications. They are made from black oxide HSS for wear resistance and reduced friction. 3G Electric supplies Chicago-Latrobe cutting tools to industrial buyers worldwide. The catalog includes NAS-spec jobber-length drill bits, single-flute countersinks, and other holemaking tools. 3G Electric provides logistics support and quotation services for these products, helping maintenance and procurement teams source specific part numbers and sizes. The product range covers common body diameters for countersinks, such as 3/8 in, 1/2 in, 3/4 in, and 1 in, and drill bit sizes like 31/64 in. Technical specifications, including point angle, coating, and standard compliance, are available for each item to support selection. 3G Electric serves plant engineers, maintenance managers, and procurement specialists who require documented tool specifications and reliable supply. The Chicago-Latrobe line is suited for operations that demand consistent hole quality and tool performance in materials ranging from aluminum and steel to stainless and high-temp alloys. By stocking and sourcing Chicago-Latrobe tools, 3G Electric supports both routine maintenance and production machining needs. The brand's focus on HSS tooling aligns with applications where toughness and heat resistance are priorities. 3G Electric's global shipping capabilities allow customers to obtain these tools regardless of location, with order fulfillment based on part number and quantity. For buyers specifying aerospace-compliant drill bits or standard countersinks, the Chicago-Latrobe catalog offers defined geometries and finishes. 3G Electric can provide quotes for specific SKUs and manufacturer part numbers, such as 42631 for the 31/64 in NAS-spec drill bit or 56774 for the 3/4 in 90° countersink. This supports accurate procurement and inventory planning. The combination of Chicago-Latrobe's established tool designs and 3G Electric's distribution infrastructure provides a pathway to acquire cutting tools with known specifications. 3G Electric does not manufacture these tools; it supplies them as part of its industrial equipment offering. The brand's history in cutting tool manufacturing dates back to the early 20th century, and its products are recognized in metalworking industries. 3G Electric maintains access to this line to meet ongoing demand for HSS drills and countersinks. For technical buyers, the key attributes are standard compliance, material, coating, and geometry—all of which are documented for each Chicago-Latrobe item in the 3G Electric catalog.

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About CHICAGO-LATROBE

Common Applications

Aerospace manufacturing — Chicago-Latrobe NAS-spec jobber-length drill bits (e.g., MPN 42631) for drilling holes in airframe components.
Metal fabrication — Chicago-Latrobe single-flute countersinks (e.g., MPN 56774) for deburring and chamfering holes in steel plates.
Machine shop — Chicago-Latrobe 82° countersinks (e.g., MPN 56738) for creating flush-mount recesses for flat-head screws in assemblies.
Maintenance and repair — Chicago-Latrobe 90° countersinks (e.g., MPN 56760) for chamfering holes and removing burrs on industrial equipment.
Automotive production — Chicago-Latrobe HSS drill bits for holemaking in engine blocks and chassis components.
General machining — Chicago-Latrobe countersinks in various body diameters for chamfering and deburring in job shops.

Frequently asked questions

Common questions about CHICAGO-LATROBE from 3G Electric.

What is the difference between Chicago-Latrobe's 82° and 90° countersinks?

Chicago-Latrobe single-flute countersinks are available in both 82° and 90° included angles. The 82° angle is commonly used for flat-head screws conforming to inch-series standards, while the 90° angle is used for metric flat-head screws and general chamfering. Both are made from black oxide high-speed steel and feature a single flute for fast cutting and chip clearance. Selection depends on the screw type and the desired chamfer geometry. For example, MPN 56738 is an 82° countersink with a 3/8 in body diameter, while MPN 56758 is a 90° countersink with the same body diameter. The angle affects the depth of the conical recess for a given screw head.

What does NAS 907 Type B mean for Chicago-Latrobe drill bits?

NAS 907 Type B is a National Aerospace Standard that specifies requirements for high-speed steel drill bits used in aerospace applications. Type B refers to drill bits with a 135° split point. Chicago-Latrobe's NAS-spec jobber-length drill bits, such as MPN 42631 (31/64 in), meet this standard. The 135° split point reduces thrust and improves hole location by preventing walking. These bits are typically TiAlN-coated for increased wear resistance and are used in materials like aluminum, steel, and stainless steel. The standard ensures dimensional and performance criteria are met for critical holemaking operations.

What sizes of Chicago-Latrobe single-flute countersinks does 3G Electric supply?

3G Electric supplies Chicago-Latrobe single-flute countersinks in several body diameters, including 3/8 in, 1/2 in, 3/4 in, and 1 in. These are available in both 82° and 90° angles. For example, MPN 56738 is a 3/8 in 82° countersink, MPN 56760 is a 1/2 in 90° countersink, MPN 56774 is a 3/4 in 90° countersink, and MPN 56778 is a 1 in 90° countersink. All are made from black oxide high-speed steel with a single flute for fast cutting. The catalog includes additional sizes and angles; buyers can request specific part numbers for quotation.

What materials are Chicago-Latrobe countersinks made from?

Chicago-Latrobe single-flute countersinks are made from high-speed steel (HSS) with a black oxide finish. The black oxide coating provides wear resistance and reduces friction during cutting. This material is suitable for deburring and chamfering in a range of materials, including steel, aluminum, and plastics. The HSS construction allows the tools to withstand the heat generated during cutting operations. The single-flute design provides rapid material removal and efficient chip evacuation. These countersinks are intended for use in drill presses, lathes, and other machining equipment where a conical recess for flat-head screws is required.

Can 3G Electric provide Chicago-Latrobe drill bits for aerospace applications?

Yes, 3G Electric supplies Chicago-Latrobe NAS-spec high-speed steel jobber-length drill bits designed for aerospace applications. These bits meet NAS 907 Type B standards and feature a 135° split point and TiAlN coating. An example is MPN 42631, a 31/64 in drill bit. These tools are used in aerospace manufacturing and maintenance where precise hole location and reduced walking are important. 3G Electric can quote specific part numbers and quantities based on customer requirements. The bits are part of the Chicago-Latrobe line of cutting tools available through 3G Electric's global distribution.

What is the purpose of the single flute on Chicago-Latrobe countersinks?

The single flute on Chicago-Latrobe countersinks is designed for fast cutting and efficient chip clearance. With only one cutting edge, the tool can remove material quickly and is less prone to chip packing, especially in softer materials. This makes it suitable for deburring and chamfering operations where speed is a priority. The single-flute design also allows for easy resharpening. These countersinks are available in 82° and 90° angles and various body diameters. They are typically used in metalworking, machining, and fabrication to create conical recesses for flat-head screws or to deburr holes after drilling.