pop rivets - proper way to use?

[PH]

Holding two parts together is the precise purpose of grub screws... whatever they're called.

Again no, a grub screw can have many purposes, it's a screw because it screws into a threaded part, it's purpose might be to plug, as in a grease port.

But we agree that it can be used to hold two parts together as well as doing those other things?

Jonathan

Well yes, and there's a variety of grub screws depending on how the parts need holding together and against what. A locating screw, as mentioned upthread is holding parts together, against moving out of location.
Just don't get started on what a set screw is...

[PH]

Fixing a pulley on a shaft. Typical grub screw application.

Jonathan

But not the one pictured.

[Jdsk]

Fixing a pulley on a shaft. Typical grub screw application.

But not the one pictured.

Why not, please?

Jonathan

[PH]

Fixing a pulley on a shaft. Typical grub screw application.

But not the one pictured.

Why not, please?

Jonathan

Because the thread is on the wrong end!

[Jdsk]

But not the one pictured.

Why not, please?

Because the thread is on the wrong end!

Thanks.

More please: why wouldn't that work with it dropping through an unthreaded well into an internally threaded hole adjacent to the shaft?

Jonathan

PS: Please feel free to suggest more appropriate uses.

[PH]

Why not, please?

Because the thread is on the wrong end!

Thanks.

More please: why wouldn't that work with it dropping through an unthreaded well into an internally threaded hole adjacent to the shaft?

Jonathan

PS: Please feel free to suggest more appropriate uses.

Are you going to wiki search for one that works like that?
Maybe you'll get lucky, it'll be an exception, in every application I've come across it's the pully which is threaded.

[Jdsk]

Yes... dropping through an unthreaded well in the pulley into an internally threaded hole in the pulley adjacent to the shaft. I think that we're describing the same thing.

Jonathan

[nirakaro]

Oxford English Dictionary:

Bolt: "A stout metal pin with a head, used for holding things fast together. It may be permanently fixed, secured by riveting or by a nut, as the bolts of a ship; or movable, passing through a hole, as the bolts of a shutter."

Meaning derives from usage, and any usage that is widely used and widely understood is, by definition, correct, whatever the dictionary may say. I'd venture to suggest that this is a case where the compilers of the OED are mistaken: I've never heard of a rivet, or any other permanently fixed, non-threaded fastener, referred to as a 'bolt'. Has anyone else?

[Jdsk]

...
I've never heard of a rivet, or any other permanently fixed, non-threaded fastener, referred to as a 'bolt'. Has anyone else?

I couldn't imagine what they were referring to when the riveting was mentioned.

But I haven't yet checked whether that extract was from a specific usage of bolt or the whole entry.

Jonathan

[PH]

Yes... dropping through an unthreaded well in the pulley into an internally threaded hole in the pulley adjacent to the shaft. I think that we're describing the same thing.

Jonathan

And just how many pulleys have you fitted like that?
The description for your part is:

Metric Slotted Head Part Threaded Grub Screws feature a partially threaded shaft, which allows the unthreaded portion to protrude from blind holes, and act as a locating device.

[Jdsk]

...
Bolts have "land" below the head and screws are threaded all the way up to the head.
...

The description for your part is:
Metric Slotted Head Part Threaded Grub Screws feature a partially threaded shaft, which allows the unthreaded portion to protrude from blind holes, and act as a locating device.

And the question was whether there's an absolute distinction between a bolt and a screw. Such as that proposed distinction based on whether it's fully or partially threaded.

This one is partially threaded and a screw, as in my emboldening.

So it's a counterexample to that proposed definition.

Jonathan

[PH]

And the question was whether there's an absolute distinction between a bolt and a screw. Such as that proposed distinction based on whether it's fully or partially threaded.

This one is partially threaded and a screw, as in my emboldening.

So it's a counterexample to that proposed definition.

Jonathan

I haven't asked that question, or made that distinction. I've said that grub screw would not be used for the application you suggest, you've disagreed. A bolt does not need to be threaded the full length, because bolting things together doesn't require that, if it did you'd be screwing them together and the fixing for that would be a screw.

[Jdsk]

...
I've never heard of a rivet, or any other permanently fixed, non-threaded fastener, referred to as a 'bolt'. Has anyone else?

I couldn't imagine what they were referring to when the riveting was mentioned.

But I haven't yet checked whether that extract was from a specific usage of bolt or the whole entry.

It's from a specific usage, number 7. So not about door bolts or similar.

I've written to the editors.

Jonathan

[Pebble]

And the question was whether there's an absolute distinction between a bolt and a screw. Such as that proposed distinction based on whether it's fully or partially threaded.

This one is partially threaded and a screw, as in my emboldening.

So it's a counterexample to that proposed definition.

Jonathan

I haven't asked that question, or made that distinction. I've said that grub screw would not be used for the application you suggest, you've disagreed. A bolt does not need to be threaded the full length, because bolting things together doesn't require that, if it did you'd be screwing them together and the fixing for that would be a screw.

A bolt will be stronger than a 'hex headed set screw' as there is more material where the shear force could be. And I think most people who work with such things will have known exactly what MickF was on about.

All these things seem to have there own curious descriptions. if the 'hex headed set screw' had a round head (slot, pozi or torq) it would be known as a machine screw. But that would leave the question (and I don't know the answer to this) what would you call a bolt that had a round head ? logic would say 'machine bolt' but googling that term just shows it as a 'hex headed set screw'

[Jdsk]

...
But that would leave the question (and I don't know the answer to this) what would you call a bolt that had a round head ? logic would say 'machine bolt' but googling that term just shows it as a 'hex headed set screw'

More please on what you're describing.

What type of "round head"? Cylindrical, domed, or doesn't it matter?

And only partially threaded?

Thanks

...

Something like this?

"Round head bolt":
https://www.portlandbolt.com/products/bolts/round-head/
http://www.worldfastener.com/products/b ... ead-bolts/

Jonathan