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There are at least five causes of loose bolts, which can occur separately or in combination: Under-tightening. By definition, an under-tightened bolt is already loose and the joint does not have enough clamp force to hold the individual sections together.
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Double-headed bolts function by “twisting off” an auxiliary...
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25 de sept. de 2020 · In some cases, there could be a dozen or more of those cuss-word bolts. We’ve all been there (band-aids, cuss-words and all). Fortunately, there are some good solutions (actually a whole bunch of them) when it comes to dealing with impossible to reach fasteners.
- Overview
- Loosening a Bolt with a Wrench or Pliers
- Heating the Bolt to Loosen It
- Removing a Rusted Bolt
- Destroying a Stuck Bolt
- Destroying a Stuck Bolt
In most cases, you can remove a bolt by unscrewing the nut from the bolt with a wrench. If the bolt is rusted or otherwise stuck in place, however, you’ll need to find another way to remove the bolt. If the hexagonal surfaces of bolt and nut haven’t been stripped, try heating the bolt with a propane torch to loosen it. In some cases, truly stuck bolts cannot be removed and need to be cut off instead. Purchase all of the supplies you’ll need at a large hardware store or a home-improvement store.
Lubricate the bolt with WD-40 and use vice-grip pliers or a long wrench to twist loose. Heat it with a torch for 15 seconds to loosen it more if needed.
For rust, apply rust-penetrating liquid thread loosener and strike the the bolt 6-12 times with a hammer. Twist loose with a long-handled socket wrench.
If a screw extractor can’t get the bolt out, cut the screw off with a reciprocating saw.
Spray penetrating oil under the bolt head and around the nut.
Penetrating oils like WD-40 will seep beneath the head of the bolt and under the nut and help to lubricate the threading on the bolt. This will make the bolt easier to loosen and will be especially useful if the bolt is rusted in place. Give the oil at least 20 minutes to soak in.
Purchase a penetrating oil at any hardware store. You might be able to find it at a large supermarket also.
Slip a hollow piece of metal over the handle of a box-end wrench.
Use a piece of metal that’s at least 2 feet (0.61 m) long. This will effectively lengthen your wrench by 2 feet (0.61 m) and will give you more torque when you try to remove the stuck bolt.
You can find hollow metal bars at large hardware or home-improvement stores. Look for a bar that has a hollow inner diameter of at least
Heat the bolt with a propane torch if it’s still stuck.
If the bolt doesn’t budge when you try loosening it with the extended wrench, it’s time to try using heat to un-stick the bolt. Turn on a propane torch, and hold the flame about
inch (13 mm) away from the bolt. Keep the flame on the bolt for about 15 seconds.
The heat from the propane torch should cause the bolt to expand.
Apply flame from the propane torch to the nut for 15 seconds.
Once you’ve applied the flame to the bolt and it’s begun to expand, switch and heat the nut for 15 seconds. Alternate between the nut and bolt for about 2 minutes total. The end of the bolt that you’re not applying flame to will contract and the end that you’re heating will expand. This will change the overall shape of the bolt.
Remove as much rust as possible with a wire brush.
Take a stiff-bristle wire brush and brush it aggressively against the rust crusted on the stuck bold (and corresponding nut). It’s next to impossible to remove a bolt that’s fully rusted in place, so scrub for 4-5 minutes until you’ve scraped off nearly all of the rust.
Large hardware stores may sell wire brushes specifically designed for stripping rust.
Saturate the threads with a rust-penetrating liquid thread loosener.
Once most of rust has been stripped away, douse both ends of the bolt with liquid thread loosener. Let the liquid soak into the metal and work its way beneath the head of the bolt for about 30 minutes. Effective brands of rust-penetrating lubricants include Liquid Wrench, PB Blaster, and Royal Purple Maxfilm.
Do not use WD-40 for this. While it’s an effective lubricant, it’s not effective at penetrating through layers of rust.
Purchase a screw extractor that matches the size of your bolt.
Find a correctly-sized screw extractor that can remove your stuck bolt by measuring the diameter of the threaded portion of the bolt. Take this measurement to a hardware store and find a screw extractor that’s about
If you have the bolt measurement, the sales staff can help you find a correctly sized extractor.
Drill out the core of the stuck bolt with a screw extractor.
A screw extractor is a long, thin piece of threaded metal that screws into an ordinary power drill. Set the point of the extractor into the center of the bolt, and slowly squeeze the power drill’s trigger. Drive the screw extractor down through the shaft of the bolt, and let it unscrew the bolt from within.
Although this will destroy the bolt, it should make it much easier to remove.
A cold chisel is another useful tool for knocking off the head of a stuck bolt.
If you’re dealing with a very large stuck bolt—say, one that’s larger than 2 inches (5.1 cm) across—try using a pipe wrench. This will give you plenty of torque, and the wrench’s jaw teeth will clamp firmly on even the most stubborn bolts.
A screw extractor is your best bet for removing a bolt whose head has been knocked completely off or flattened.
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Exercise caution with using a propane torch. The flame burns extremely hot, so never point it towards your face or hands.
Propane is highly flammable. Store propane in a cool environment away from any open flames or other sources of heat.
16 de oct. de 2019 · When you're dealing with really big stuck bolts, a pipe wrench might be your best option, especially if you don't own a giant set of wrenches or sockets. The long handle and aggressive jaw teeth will loosen the most stubborn bolts. Just make sure you get the jaws tight against the shoulders.
Bolts and other fasteners can become loose for a variety of reasons, including shock, vibration and dynamic loads. If a bolted application is poorly designed or not installed correctly, it is far more likely to become loose.
Bolts loosen immediately once installed. Engineers refer to this short-term loss of clamp force as relaxation. In some instances, a relaxation of 10% to 20% is common. When tightening a bolt, the surfaces under load are deformed and flattened in a process known as embedment.
18 de ene. de 2018 · [Fig.3] shows examples of excessively long incomplete threads and improper application of shoulder bolts. The subject to be fastened is not properly fastened with bolts and nuts.
