How To Take Off Rivets: The Professional Guide To Drill, Punch, And Shear Blind And Solid Rivets

Removing rivets requires precise mechanical intervention to sever the manufactured head without enlarging or damaging the underlying mounting holes. Success relies on matching drill bit diameters to rivet body sizes, maintaining stable axial alignment, and using specialized backing tools to drive out stubborn remaining shanks.

Pre-Operation & Equipment Checklist

Extracting mechanical fasteners like rivets demands a calculated approach to prevent structural degradation of the surrounding sheet metal, frame, or assembly. Before initiating extraction, you must analyze the rivet material, diameter, and joint accessibility. Blind rivets (pop rivets) feature a hollow core and generally use softer aluminum or steel shells, whereas solid structural rivets demand greater shear force and precision to extract.

• Essential Gear, Tools, and Materials:
  
  
  • Variable-speed power drill or pneumatic drill motor
  • High-speed steel (HSS) or cobalt drill bits sized to match the rivet drill charts
  • Center punch and a small ball-peen hammer
  • Pin punch set (specifically 1/8-inch and 3/32-inch sizes)
  • Needle-nose pliers or diagonal cutting pliers
  • Safety glasses, leather work gloves, and hearing protection
  • Backing support block or bucking bar if dealing with structural applications
• Mandatory Prerequisite Knowledge and Standards:
  
  
  • Identification of fastener alloy classification (aluminum, stainless steel, monel, or structural steel)
  • Understanding of standard fractional and metric drill bit sizing relative to rivet body diameters
  • Verification that the workpiece is securely clamped to prevent harmonic vibration or dangerous spin-out during drilling
• Estimated Budget and Duration Benchmarks:
  
  
  • Budget: Minimal ($10 to $25 if purchasing specialized cobalt bits and pin punches)
  • Duration: Approximately 2 to 5 minutes per standard blind rivet; structural or high-shear blind rivets may require 5 to 10 minutes per fastener depending on material hardness

Step-by-Step Rivet Removal Workflow

Step 1: Center Punch the Rivet Head

• Inspect the face of the rivet to locate the exact center point of the manufactured head. For hollow blind rivets, the center will feature a small hole where the mandrel snapped off during installation. For solid rivets, the head is a smooth, rounded dome.
• Place the tip of a sharp center punch directly into the center of the rivet head or the remaining mandrel stub. Strike the top of the punch firmly once with a ball-peen hammer to create a definitive indentation.
• Warning: A poorly centered punch mark causes the drill bit to wander off-axis, chewing up the surrounding parent material and enlarging the structural mounting hole beyond usable tolerances.

Step 2: Select the Correct Drill Bit Size

• Consult a standard rivet drill chart to match the fastener body diameter with the appropriate drill bit size. For a standard 1/8-inch (dash-4) rivet, use a #30 drill bit (0.1285 inches). For a 5/32-inch (dash-5) rivet, select a #21 drill bit (0.1590 inches). For a 3/16-inch (dash-6) rivet, use a #11 drill bit (0.1910 inches).
• Insert the chosen high-speed steel or cobalt twist drill bit into your drill chuck, ensuring it runs true without excessive lateral runout. Cobalt bits are strongly recommended if you are removing stainless steel or monel rivets, as they resist thermal degradation better than standard HSS bits.

Step 3: Drill Off the Manufactured Head

• Hold the drill perpendicular and square to the face of the rivet workpiece. Apply moderate, consistent axial pressure and operate the drill at a medium-low speed to prevent excessive heat generation that can work-harden the surrounding aluminum or steel sheet.
• Feed the bit into the rivet head until you feel the resistance suddenly drop. This indicates that the manufactured head has sheared away from the cylindrical rivet body.
• Stop drilling immediately when the head separates. Use a magnetic pickup tool or compressed air to clear away the metal shavings and the detached rivet head.

Step 4: Punch Out the Remaining Shank and Mandrel

• Inspect the joint to see if the remaining hollow body or steel mandrel stub is still wedged inside the mounting hole. If it falls out freely, the extraction is complete. If it remains stuck, place a pin punch with a diameter slightly smaller than the rivet body directly against the exposed top of the leftover shank.
• Tap the end of the pin punch lightly with a hammer to drive the remaining sleeve entirely through the back of the joint. Retrieve the fallen slug from the reverse side of the assembly.
• Pro-Tip: If the rivet spins inside the hole while you attempt to drill it, insert the tips of a pair of diagonal cutters beneath the edge of the spinning head, pull upward gently to create tension, and resume drilling to lock the body in place.

Rivet Size to Drill Bit Reference Matrix

Common Site Failures and Field Fixes

• Root Cause: The drill bit wanders off the center of the rivet, gouging and enlarging the mounting hole in the parent sheet.
  
  
  • Actionable Fix: Stop drilling immediately. Switch to a tapered round file or a small deburring tool to clean the damaged hole, then step up the fastener size to the next standard rivet dimension or use a backing washer during reinstallation to bridge the enlarged aperture.
• Root Cause: The entire rivet body spins continuously within the hole as rotational friction from the drill bit overcomes the friction of the joint.
  
  
  • Actionable Fix: Wedge the jaws of a pair of diagonal cutters or needle-nose pliers underneath the lip of the rivet head to apply upward tension, or press a flathead screwdriver against the edge of the head to physically block its rotation while drilling.
• Root Cause: The drill bit snaps off inside the hardened steel mandrel of a blind rivet due to excessive lateral force or binding.
  
  
  • Actionable Fix: Because broken drill bits are exceptionally hard, standard bits cannot cut through them. Use a sharp punch and a hammer to shatter the embedded bit fragment, or use a carbide-tipped rotary burr in a die grinder to grind away the obstruction carefully.

Frequently Asked Questions

What drill bit size should I use to take off a standard pop rivet?

For a standard 1/8-inch pop rivet, you should use a #30 drill bit, which measures 0.1285 inches in diameter. This provides just enough clearance to slice through the outer aluminum or steel shell without shaving away the edges of the parent mounting hole. Always match your bit size to the specific grip range and diameter designation of the fastener.

How do I remove a rivet if I cannot access the back side of the panel?

Blind pop rivets are specifically designed for single-side access installation and removal. You simply drill off the manufactured head from the front using a standard twist drill, and then use a pin punch to drive any remaining internal mandrel pieces or sleeve remnants entirely through the blind side into the interior cavity where they can be retrieved later.

Can I reuse the same rivet hole after removing an old rivet?

Yes, you can typically reuse the exact same hole provided the extraction process was executed cleanly without bit-wandering or hole enlargement. If the hole has become slightly elongated or stripped out during removal, you must ream the hole to the next fractional size and install a larger-diameter replacement rivet or structural fastener.

What should I do if the rivet keeps spinning while I am drilling it?

Spinning occurs when the friction holding the rivet body inside the hole is less than the rotational torque of the drill. To stop this, slide the cutting edge of a pair of diagonal pliers underneath the head of the rivet and pry upward gently while drilling to create binding friction that stops the rotation.

Master the art of fastener extraction with precision tools and proper techniques to ensure your assemblies remain structurally sound and ready for re-assembly.