Can you please explain where shoulder bolts are used?
Here are a few applications that come to mind:
- A joint in which the bolts are required to carry a large portion of the shear loads.
- A joint that requires relative motion between the two parts. One part will have a slot while the other the tapped hole (the slot surrounds the shoulder section).
- Any time a part requires a spring, a shoulder bolt can be used as a guide. The absence of threads makes a nice guide that will not bind up the spring, i.e. stamping dies.
- Along the lines of the shear carrying, clevis pins are usually shoulder bolts.
- You can use a shoulder bolt as a kind of axle. Think of mounting guide wheels on a sliding drawer or a rotating arm.
- Mounting bearings so as to allow rotation.
I have attached an image.
Can you please explain why shoulder screw is used in this application?
why an allen screw is not used?
It's impossible to tell you that without knowing the function of what it is you are showing us. I will tell you that an allen screw would not clamp any joint together. How would this joint maintain any kind of load with a set screw in it?
Is something missing here? There is an area adjacent to the shoulder which is unlabeled. Is that simply clearance (in which case it makes no sense), or is it a bushing of some kind? In either event, the washer is not doing much to transfer the load. Clearly no rotation is meant and, so, the whole purpose might be precise location. If that is the case, why not a reamed hole.
What is this thing?
Oh, wait a minute. Are these pieces insulators? Something like G10?
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