EDM Broken Tap and Bolt Removal

How EDM tap and bolt removal works

EDM removes broken taps and bolts by eroding the stuck piece at a microscopic level. A shaped electrode targets the broken tool while the workpiece sits submerged in dielectric fluid. The electrical discharge vaporizes the obstruction layer by layer without ever contacting the surrounding material.

The process is non-contact, so the original threads and bore finish stay intact. The electrode removes only the broken piece, and because there is no cutting force or mechanical stress on the surrounding material, the hole is ready for a new tap to chase the existing threads.

EDM tap and bolt removal works on any conductive material: hardened tool steel, carbide, stainless steel, Inconel, titanium. The material can be fully hardened. No annealing or heat treatment reversal is required. The process handles blind holes and through holes.

When to use EDM instead of manual extraction

Manual methods have a place, but they carry real risk. Screw extractors can snap inside the hole, leaving you with two problems instead of one. Drilling risks going off-center, widening the bore, or destroying threads beyond repair. Left-hand drill bits only work if the fastener is loose enough to back out, and if it broke in the first place, it probably isn’t.

EDM is the right method when the material is too hard for conventional extraction tools. If the tap or bolt broke because the workpiece is hardened steel or carbide, the same hardness that caused the break makes manual removal nearly impossible. EDM doesn’t care about material hardness. It erodes any conductive material at the same controlled rate.

If the part is too valuable to risk further damage, EDM is the safe option. Same if the fastener sits in a blind hole with no room to drill. And if a previous extraction attempt already failed and left a broken extractor jammed inside the original hole, EDM can remove that too.