How To Drill Out A Rivet: Complete Guide To Fastener Removal
Drilling out a standard blind rivet requires matching a high-speed steel or cobalt drill bit to the manufactured head diameter, stabilizing the workpiece, and applying steady axial pressure to shear the mandrel and body without enlarging the panel hole. Master this mechanical technique to safely disassemble aluminum, steel, and composite structures without damaging surrounding surfaces.
Pre-Operation & Equipment Checklist
Removing structural fasteners efficiently relies on selecting the correct cutting geometry, drill speed, and personal safety equipment. Blind rivets, commonly referred to as pop rivets, are engineered from ductile metals like aluminum, copper, or soft steel, which means they deform easily if subjected to incorrect rotational speeds or dull cutting tools.
- Essential Gear, Tools, and Materials: Variable-speed corded or cordless drill, 1/8-inch and 3/16-inch Jobber-length twist drill bits (High-Speed Steel or Cobalt), center punch, ball-peen hammer, safety glasses, heavy-duty work gloves, pneumatic chisel or drift punch (optional), and a vacuum or brush for metal shavings.
- Mandatory Prerequisite Knowledge and Standards: Understanding rivet sizing standards (such as fractional sizing where a #4 rivet equals 1/8 inch and a #6 rivet equals 3/16 inch), identifying countersunk versus protruding dome heads, and recognizing the hardness differential between the rivet body and the structural substrate.
- Estimated Budget and Duration Benchmarks: Financial investment ranges from ten to thirty dollars if purchasing standard drill bits; time investment averages two to five minutes per fastener once the workstation is prepped.
Step-by-Step Rivet Removal Workflow
Step 1: Secure the Workpiece and Inspect the Fastener
Examine the rivet to determine its nominal diameter and head style. Standard dome heads require direct axial drilling, whereas flush countersunk heads demand extreme precision to avoid gouging the surrounding skin or panel. Secure the assembly in a bench vise or clamp it rigidly to a stable workbench. Movement during the drilling process will cause the bit to wander, ruining the hole geometry.
Warning: Never attempt to drill out a rivet while holding the workpiece in your bare hand. The sudden breakthrough or bit binding can cause the tool to spin violently, resulting in hand lacerations.
Step 2: Center Punch the Mandrel
Locate the exact center of the rivet head where the central steel or aluminum mandrel protrudes. Place the tip of a sharp center punch into this recess and strike it firmly with a ball-peen hammer. This creates a small divot that prevents the drill bit from skating across the smooth, rounded surface of the rivet head when the trigger is pulled.
Step 3: Select and Align the Drill Bit
Choose a drill bit whose diameter matches or is slightly smaller than the rivet's shank size. For a standard 1/8-inch rivet, use a #30 drill bit (0.1285 inches) or a standard 1/8-inch HSS bit. Insert the bit securely into the drill chuck and ensure it runs true without excessive wobble. Position the tip of the bit squarely inside the center-punched indentation, maintaining a 90-degree angle relative to the panel surface.
Step 4: Apply Controlled Pressure and RPM
Activate the drill at a moderate to high speed while applying steady, moderate axial pressure. High-speed steel bits require sufficient feed pressure to cut the metal rather than rub against it, which work-hardens the aluminum rivet body. Keep the drill aligned strictly perpendicular to the panel. As the bit cuts through the manufactured head, the head will detach from the body and spin up the shaft of the bit or pop off entirely.
Pro-Tip: If the drill bit begins to squeal or smoke, stop immediately, clear the metal chips, and apply a drop of cutting fluid or lightweight machine oil to reduce friction and preserve the cutting edge.
Step 5: Punch Out the Remaining Body
Once the head is separated, the remaining tubular sleeve of the rivet will sit inside the structural hole. Use a pin punch or drift punch that matches the inner diameter of the hole, place it against the back of the remaining rivet shaft, and tap it lightly with a hammer. The old rivet body will drop out the backside of the joint, leaving a clean, undamaged hole ready for a replacement fastener.
Bisitoy Pop Rivet Gun Adapter Kit, Rivet Drill Attachment with 4 Rivets ...
Rivet Material Properties and Drill Selection Matrix
| Rivet Material | Recommended Drill Bit Type | Optimal Drill Speed (RPM) | Lubrication Requirement | Primary Removal Challenge |
|---|---|---|---|---|
| Aluminum | High-Speed Steel (HSS) | 2,000 - 3,000 | Optional (Dry or Wax) | Gummy chips wrapping around the bit |
| Stainless Steel | Cobalt (M35 or M42) | 1,000 - 1,500 | Mandatory (Cutting Fluid) | Rapid work-hardening of the alloy |
| Copper | High-Speed Steel (HSS) | 1,500 - 2,000 | Light Oil | Ductility causing the bit to grab |
| Monel | Cobalt or Solid Carbide | 800 - 1,200 | Mandatory (Heavy Oil) | Extreme tensile strength and tool wear |
Common Site Failures and Field Fixes
Even experienced technicians occasionally encounter complications during fastener extraction. Addressing these issues correctly prevents permanent structural damage.
- Root Cause: The drill bit wanders off-center and enlarges or elongates the structural mounting hole.
- Actionable Fix: Switch to a slightly larger rivet size (e.g., step up from a 1/8-inch to a 5/32-inch fastener) or ream the hole cleanly to the next standard fractional dimension before installing a new blind rivet.
- Root Cause: The steel mandrel inside the aluminum rivet spins freely with the drill bit, preventing the head from shearing off.
- Actionable Fix: Wedge a small flathead screwdriver or scraper underneath the edge of the rivet head to apply upward tension, or use diagonal cutting pliers to grip the head while applying drilling pressure.
- Root Cause: The drill bit snaps off flush inside the rivet body due to lateral side-loading or excessive force.
- Actionable Fix: Use a sharp-pointed awl or carbide pick to shatter and extract the broken bit pieces, or use a small masonry punch to drive the assembly out if the surrounding material permits.
Frequently Asked Questions
What size drill bit do I need to remove a standard pop rivet?
You should match the drill bit size to the original hole diameter of the rivet. For a standard 1/8-inch rivet, use a 1/8-inch or #30 drill bit. For a 3/16-inch rivet, use a 3/16-inch or #11 drill bit. Avoid using an oversized bit, as this will widen the mounting hole.
Can I use a regular household drill to drill out rivets?
Yes, any standard variable-speed corded or cordless drill works effectively for this task. The critical factor is maintaining a straight alignment and moderate pressure rather than relying on heavy industrial machinery.
What happens if the rivet spins while I am trying to drill it?
Spinning occurs when the internal mandrel breaks free from the gripping jaws of the sleeve. To stop the rotation, wedge the edge of a flat-blade screwdriver underneath the rivet head to create friction, or grip the outer flange with needle-nose pliers while drilling.
How do I prevent the drill bit from slipping off the rivet?
Always use a center punch and hammer to create a deep indentation in the center of the rivet mandrel before starting the drill. This pilot dimple locks the tip of the bit in place and prevents it from scratching the surrounding panel.
Are blind rivets reusable after they are drilled out?
No, blind rivets are single-use fasteners. Once the central mandrel is pulled and snapped during installation, the body deforms permanently, requiring a new rivet for re-assembly.
Upgrade Your Fastener Removal Workflow Today
Explore our professional-grade selection of cobalt drill bits, pneumatic rivet shavers, and hardware replacement kits to streamline your next restoration project. Equip your workshop with precision instrumentation designed to preserve structural integrity and deliver flawless mechanical results.
