Many technicians have success welding a nut to broken bolts and can even get them out with a set of pliers. Again, the advantage is distributing the load equally and broadly across every mating point.Īs with any repair, the tool you use depends on the application. In addition, the straight splines will bite in at six points, rather than just four with cheaper extractors. After tapping in the straight splined extractor, slide the turn nut down flush with the broken bolt.

ProMAXX Tool recommends the straight splined extractor with a turn nut because it allows you to apply force as close to the broken bolt as possible, rather than distributing the load across a 1-2” shank. That means, 0.01” offset here, 0.05” offset there, and you’re now drilling with an accuracy of +/- 0.06”, that’s nearly 1/16” of an inch. In addition, unlike other drill guides on the market, we take into consideration “tolerances.” Any “slop” in a drill guide, a drill guide bushing or even the fasteners connecting the drill guide will compound. Each ProPlate in the kits has been designed and manufactured for a unique bolt pattern.

(C) Additional torque is introduced, which increases the probability of breaking the extractor.Īt ProMAXX Tool, our ProKits allow technicians to bring the absolute dead-center accuracy of a machine shop right to the repair bay. (B) When extracting, the applied force will be unevenly distributed to the extractor, causing unnecessary stress and increasing your odds of the extractor breaking. If the pilot hole is drilled off-center: (A) You will not be able to drill to a larger gauge without coming into close proximity of the threads. Hammer in the extractor and begin turning it clockwise, then counter-clockwise. Start small, and work your way up to the largest gauge possible required for the extractor. You will start the bolt extraction process by drilling a pilot hole. When you go to extract the screw or bolt, you are going to apply torque to a bolt that is already broken due to some sort of fragility or resistance.

Drill a hole as dead-center accurate as possible Moreover, this style of extractor allows turning the bolt in either direction, easing the removal.Ģ. This Multi-Spline Screw Extractor is the only style of extractor that ProMAXX Tool uses in our exhaust manifold repair kits, due to its effectiveness, durability, and predictability on break-torque. ProMAXX Tool recommends the straight fluted extractor with a turn nut due to its resistance to deforming the broken stud or bolt while delivering an equal distribution of force and torque directly to the extractor. Check out our article, “ which screw extractor should I use ”. There are many styles of extractors available on the market from reputable American manufacturers. Deciding to go with a lower quality solution to fix this problem can lead to a compounded issue when the hardened steel breaks along the shank during extraction. You are already running behind on the job due to a broken bolt. The least expensive offshore broken screw extractor that you picked up at the value-home-center may only lead to disaster. When choosing a bolt extractor, do not Pick the most convenient method choosing and using The best broken bolt screw extractorġ. In a much more unfortunate situation, the threads of the bolt and the mating surface may have been compromised, usually due to two dissimilar metals fusing from chemical reactions, excessive heating and cooling or the bolt being installed with the wrong torque spec ratio. You may have also used too much torque when removing the bolt (common when overusing your high-powered impact wrench). The bolt may have been extremely corroded leading to the head breaking off. The bolt can be broken for a number of reasons. The bolt or screw you are attempting to remove may be broken off above the mating surface, flush with the surface or below the surface. When you are attempting to remove a broken bolt using an extractor, you need to choose a broken bolt extractor that is the best fit for the job. Even more important, is using it correctly so that you can avoid breaking the extractor off inside the broken bolt or screw. Choosing the right one is critical to getting the job done more productively. There are many different types of screw and bolt extractors on the market.

Drill out bolt extractor