Best Drill Bit for Drilling out Rivet of 2026 For Clean Metal Removal

Conquering Spinning Rivets and Damaged Fastener Holes

Spinning rivet mandrels and wandering drill points create massive headaches when stripping out aluminum or stainless steel fasteners from auto bodies and gutters. Standard jobber bits tend to skate off convex factory rivet heads, chewing up surrounding sheet metal and enlarging mounting holes before the core ever pops free. Matching your drill with the best drill bit for drilling out rivet prevents that costly damage by centering the cutting edge directly on the fastener shank. Left-hand flutes and high-cobalt alloys bite into hardened rivet bodies without overheating, letting your keyless ratcheting chuck grip the tool firmly without slipping under heavy downforce.

Careful analysis of tool metallurgy reveals that grade M2 high-speed steel and cobalt coatings handle the friction of spinning fasteners far better than soft titanium-dipped bits. Dialing your drill back with a steady variable speed trigger allows these specialized cutters to shave rivet heads clean off without wallowing out the base material. Sheet metal fabricators often pair these drill extractors with a dedicated cold cut metal chopsaw when modifying structural framing or rebuilding trailer panels. Relying on durable left-hand reverse bits and dedicated rivet guides gives you clean extractions and keeps your workpieces pristine for new hardware installation.

Frequently Asked Questions

What size drill bit should you use for drilling out rivets?

Select a drill bit that exactly matches or slightly exceeds the inner diameter of the rivet shank, such as a 1/8-inch bit for a 1/8-inch rivet. Using an undersized bit leaves the outer sleeve stuck in the hole, while an oversized bit will gouge the mounting plate. Setting your cordless drill to a moderate speed helps sheer the dome head off without boring through the surrounding base material.

Are cobalt drill bits better than titanium bits for stainless steel rivets?

Yes, cobalt drill bits hold up substantially better against stainless steel fasteners than standard titanium-coated bits. Stainless steel work-hardens rapidly under pressure, producing extreme friction that burns through thin surface coatings within seconds. High-cobalt steel retains its cutting temper at elevated temperatures, keeping the flute edges pointed and sharp throughout repetitive extractions.

Why do left-hand drill bits work so well for rivet removal?

Left-hand drill bits rotate counterclockwise, which frequently catches the rivet body and spins it loose rather than driving it tighter. If a blind fastener breaks loose from its backing, standard clockwise rotation merely spins the rivet in place. Running a reverse flute bit in your drill chuck applies unwinding torque that can extract stubborn pins immediately.

How do you prevent a drill bit from slipping off a dome head rivet?

Using a spring-loaded center punch or a specialized rivet guide attachment creates a stable pilot dimple that keeps the bit centered. Domed brazier and button heads lack flat surfaces, which causes standard twist bits to skate across delicate sheet metal. A 135-degree split point bit also starts cutting on contact without walking, protecting your workpiece from unsightly scuffs.

Should you use high speed or low speed when drilling out blind rivets?

Low drilling speeds with firm, steady forward pressure produce the best results when removing rivets. High RPM speeds generate excessive thermal buildup that can melt aluminum fasteners or work-harden steel rivets, causing the bit to dull prematurely. Feathering a sensitive variable speed trigger ensures you stop cutting the exact moment the rivet head pops off.

Can you reuse rivet holes after removing fasteners with the best drill bit for drilling out rivet?

Yes, existing rivet holes remain completely reusable as long as you remove only the factory head and knock out the center pin. Dedicated guide collars prevent the bit from drifting into the workpiece metal, preserving the original factory hole dimensions for a fresh fastener. If you are replacing whole wall skins or siding after pulling rivets, using the right saw for cutting paneling with a guide ensures matching seams and clean alignment.

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