What Does a Small Inverted Tear Drop Burr Do?
By Supergrit Abrasives | Published: 2026-10-23
Category: How-to Guides
Learn the specific uses of a small inverted tear drop burr for die grinders, including deburring, shaping, and finishing tight contours. Practical advice for rotary tool users.
Quick answer
A small inverted tear drop burr is designed for deburring, shaping, and finishing in tight or angled spaces where a standard round burr cannot reach. Its tapered shape lets you work into corners and along edges without marring adjacent surfaces.
Why the inverted tear drop shape matters
The inverted tear drop profile gives you a pointed tip for accessing narrow grooves and a wider body for broader contact. This makes it especially useful for cleaning up weld beads, breaking sharp edges, and smoothing internal radii on metal parts.
Because the burr tapers, you can control the depth of cut by changing the angle of the tool. A shallow angle removes less material; a steeper angle cuts more aggressively. This versatility is hard to get with a ball or cylinder shape.
Trade-offs vs. other burr shapes
The small inverted tear drop burr is not ideal for flat surface work or large-area stock removal. For those jobs, a cylindrical or ball burr covers more ground faster. The tear drop excels where precision and access matter more than speed.
Its 1/4" shank fits most die grinders and rotary tools, but the small head size limits material removal per pass. If you need to hog out a lot of metal quickly, consider a larger burr or a different shape first.
Frequently asked questions about the small inverted tear drop burr
- What materials can I use it on?
- This carbide burr works on ferrous and non-ferrous metals, including steel, stainless steel, aluminum, and brass. It also works on hardened steel and cast iron. Avoid using it on wood or plastic — the carbide edge can chip or load up.
- What speed should I run it at?
- For carbide burrs on steel, run your die grinder between 20,000 and 30,000 RPM. For softer metals like aluminum, reduce speed to 15,000–20,000 RPM to prevent loading. Always follow the manufacturer's recommended max RPM for the burr size.
- How do I use it to deburr a hole?
- Insert the pointed tip into the hole at a slight angle. Rotate the burr in a circular motion while applying light pressure. The tapered sides will chamfer the edge evenly. Move to the opposite side of the hole to deburr both edges. For consistent results, deburr the entry and exit sides separately rather than trying to do both in one pass.
- Can I use it in a drill press?
- A drill press lacks the speed and side-load capacity of a die grinder. Carbide burrs need high RPM and light side pressure. Using one in a drill press risks chipping the carbide or damaging the chuck. Stick to a die grinder or a high-speed rotary tool.
- How do I clean a loaded burr?
- If the burr loads up with aluminum or soft metal, dip it in a light oil or use a wire brush while it spins at low speed. For stubborn buildup, soak it in a solvent like acetone for a few minutes, then brush clean. Do not use abrasive cleaners that could wear the carbide. Prevent loading by using a lubricant like WD-40 or cutting oil when working on aluminum.
Product facts
- Small Inverted Tear drop w/1/4" shank: Small Inverted Tear drop with 1/4" shank from Supergrit Abrasives. Shape: small inverted tear drop. Shank size: 1/4". SKU: D-SM1/4. The 1/4" shank fits most standard die grinders and rotary tools, so you can use it without special adapters. The small head size is ideal for detail work in tight spaces.
Small Inverted Tear drop w/1/4" shank
