Can you tighten a bolt too much?
Yes, you can over-tighten a bolt, but doing so is unlikely. Most bolts come with instructions that the bolt’s maximum torque. The ó-inch Power Bolt, for example, has a maximum torque of 25-foot pounds.
What happen to screw if you over tighten them with a screwdriver?
Screws can become stripped if you over-tighten them with a screwdriver. A stripped screw, as shown in Figure 2, may get stuck in the screw hole, or it may not tighten firmly.
How do I stop my nut and bolt from coming loose?
The best way to prevent nuts and bolts from working loose, due to vibrations, is to use a locking device. Some examples of locking devices include flat washers, spring washers, and mechanical screw locking flange nuts.
What happens when you tighten a nut on a fastener?
Both springs stretch measurably, but the weaker one stretches more. Part of the external load is absorbed by the joint and part by the fastener. To be crystal clear, as you tighten the nut the bolt will compress the two parts together.
How much tension is needed to break a fastener?
If a bolt is rated to yield at 3,000 lbs of tension, any static load less than that will not have a permanent effect. However, if you were to vary that applied load over time you can fatigue the bolt until it breaks using less than 3,000 lbs!
How many cycles does it take for a bolt to break?
As a very general estimate, a bolt will require an infinite number of cycles to break if the fatigue load is around 30% (+/-15%) of the ultimate static load. You can expect the bolt to break in a few thousand cycles if the fatigue load is about 80% (+/-10%) of the ultimate static load.
Can a split washer prevent a bolt from rotating?
In practice a split washer is unable to gain any purchase against hard surfaces and does not actually prevent rotation. The problem is that split washers make for poor springs and bottom out after only a small percentage (on order of 10%) of a bolt’s total clamping load.
Do you tighten the nut or the bolt head?
In this situation, apply tightening force to the smaller bearing face. For instance, if the bolt head is smaller than the nut, you should tighten the bolt head and not the nut. Apply tightening force to the part that’s against the material with a lower coefficient friction capacity. Torque on the side that’s likely to produce the least friction.
How to tighten engine bolts the right way?
1 Tighten all bolts in sequence, and in two stages to a snug torque value of say, 30 Nm 2 Apply a 90 degree rotation to all bolts in the proper tightening sequence 3 Apply a further 90 degree rotation to all bolts in the proper tightening sequence
Which is the correct way to tighten a cylinder head?
For example, a typical cylinder head tightening sequence might look like this-. Tighten all bolts in sequence, and in two stages to a snug torque value of say, 30 Nm. Apply a 90 degree rotation to all bolts in the proper tightening sequence. Apply a further 90 degree rotation to all bolts in the proper tightening sequence.
Why does it take less torque to loosen a bolt than to tighten it?
It would seem, then, that if you torqued a nut or bolt to exactly 100 lb-ft, removing it would require exactly 100 lb-ft of torque applied in the opposite direction. But that’s not the case. And YouTuber AvE has an in-depth explanation of why that’s the case, complete with demonstrations and data.