Chicago-latrobe 41621 Jobber Drill 21/64 in Tin Hss

Product Description

The CHICAGO-LATROBE 41621 is a high-speed steel jobber-length drill bit from the 150ASP-TN series, engineered for demanding metal-cutting applications. It carries a titanium nitride (TiN) coating that reduces friction and extends tool life compared to uncoated HSS. The 135-degree split point promotes fast penetration and self-centering on hard materials, minimizing the need for a center punch. At 4.625 inches overall length with a 3.3125-inch flute, this bit fits standard jobber-length chuck applications and meets NAS 907 Type B standards. It is a go-to choice for trades cutting through tough materials on the job.

This drill bit is designed for drilling stainless steel, cast iron, and similarly hard ferrous metals where standard general-purpose bits lose their edge quickly. The TiN coating and split-point geometry make it well suited for HVAC, plumbing, electrical, and fabrication professionals who regularly drill structural steel, pipe hangers, brackets, and enclosures. Its straight shank fits standard three-jaw drill chucks on corded or cordless drills and drill presses without adapters.

Key Features

• TiN coating reduces heat buildup and extends cutting life on hard metals
• 135-degree split point self-centers and reduces walking on smooth or curved surfaces
• Web-thinned, tapered web lowers thrust requirements and improves chip evacuation
• High-speed steel construction with heavy-duty grade rating per NAS 907 Type B
• Regular spiral flute promotes efficient chip removal during through-hole drilling
• Straight cylindrical shank seats securely in standard drill chucks

Compatibility

Designed as a jobber-length replacement or direct-use drill bit for applications requiring a 21/64-inch diameter hole in stainless steel, cast iron, and similar hard ferrous materials. Fits any standard three-jaw chuck accepting a straight shank of 0.3281-inch diameter.

Installation Notes

A licensed electrician, plumber, pipefitter, or mechanical tradesperson typically installs fasteners and penetrations using drill bits of this type. Always secure the workpiece before drilling and wear appropriate eye and hand protection. Use cutting fluid or a compatible coolant when drilling stainless steel or cast iron to manage heat and protect the TiN coating. Inspect the bit for edge wear or chipping before each use; a damaged split point will reduce accuracy and accelerate tool failure.