Chicago-latrobe 69012 Jobber Drill Bit Wire 12 Hss 135

Product Description

The CHICAGO-LATROBE 69012 is a heavy-duty jobber length drill bit designed for drilling into steel alloy and similar ferrous materials. Built from high speed steel with a bright uncoated finish, it carries a wire gauge size of 12, which equals 0.1890 inches in decimal. The 135-degree split point self-centers on contact, reducing the need for a center punch on flat stock. A parabolic flute geometry improves chip evacuation and helps maintain cutting efficiency at higher feed rates. At 3.5 inches overall length with a 2-5/16-inch flute, this bit fits standard drill chucks and magnetic drill press setups used daily in fabrication and mechanical service work.

The 69012 is sized for general metalworking applications where wire gauge drill sizes are specified. It is well-suited for drilling mild and alloy steel in residential and light commercial maintenance, HVAC equipment fabrication, structural assembly, and plumbing rough-in work. The straight-cylindrical shank seats securely in a keyed or keyless chuck. The Series 150DH designation identifies it as part of a heavy-duty line intended for production and repetitive hole drilling where dimensional consistency matters. Diameter tolerance is held to -0.0007 to 0.0000 inches, making it appropriate for close-tolerance holes where fit matters.

Key Features

• Wire size 12 at 0.1890 inches decimal — matches standard drill charts for steel alloy applications
• 135-degree split point self-centers and reduces thrust load on entry
• Parabolic flute design promotes fast chip clearing in deep or blind holes
• Web-thinned tapered web reduces cutting resistance during penetration
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• Heavy-duty Series 150DH grade built for repetitive production drilling

Compatibility

Designed as an OEM-style replacement or direct-use jobber length drill bit for applications requiring a wire gauge size 12 straight-shank bit in metalworking, HVAC fabrication, mechanical assembly, and general trade service work.

Installation Notes

This bit is installed and operated by machinists, fabricators, HVAC technicians, and general trade mechanics using a standard drill press, hand drill, or magnetic base drill. Secure the straight shank fully in the chuck before operation and verify the workpiece is clamped or fixtured to prevent rotation. Use appropriate cutting fluid when drilling steel alloy to extend bit life and maintain hole tolerance. Inspect the cutting edges and web for wear or chipping before each use on close-tolerance work.