21073 - 3/8 Inch Steel Power Tube Brush

Essential Tool for Hole Cleaning and Prep

For welders and fabricators, preparation is everything, and cleaning out tight spots is often the hardest part of the job. The Weiler 21073 3/8" Power Tube Brush is the solution for getting inside bolt holes, tubing, and drilled cavities to strip away rust, dirt, and machining residue. Whether you are prepping a piece of steel for a critical weld or cleaning out threads to ensure a bolt seats properly, this brush attaches quickly to your standard hand drill or die grinder (with appropriate collet) to make short work of internal cleaning.

The brush features a rugged steel wire fill that is tough enough to scrub away oxidation but fine enough (.004") to get into the roots of threads without damaging them. The crimped wire design adds flexibility, allowing the brush to squeeze into the hole and expand slightly to maintain constant contact with the walls. This is especially useful for blind holes where chips and gunk tend to accumulate at the bottom. The stem is made from a single continuous piece of stainless steel, meaning it won't snap off easily under load, giving you a tool you can rely on when you are in the middle of a job.

Versatility is key in the shop. This brush isn't just for steel; it works great on cast iron, copper, and even ceramic or soft tile if you are in a mixed-material environment. The 1/8" shank is a standard size that fits almost any drill chuck or rotary tool. With a max RPM of 2000, you can run it at a controlled speed to ensure a thorough clean without overheating the wire or the workpiece.

Don't let dirty bolt holes or internal corrosion compromise your project. Adding a set of these power tube brushes to your toolbox ensures you have the right tool for those hard-to-reach internal diameters. It is a small investment that saves time and frustration, ensuring that every inch of your workpiece—inside and out—is professionally prepped and ready for the next step in fabrication.