Cycling UK Forum

Mick F wrote: ↑14 Jan 2023, 7:43pm Bolts are bolts, and screws are screws.
Bolts have "land" below the head and screws are threaded all the way up to the head.

Mick F wrote: ↑14 Jan 2023, 8:52pm Wood screws and other "fixing" screws are a different thing entirely.

Engineering wise, a screw is a screw and a bolt is a bolt .......... as I stated.

Is that a way of agreeing that that fastener in the image upthread is a screw rather than a bolt despite having ""land" below the head"?

So how do we decide when to apply that rule and when not to?

Thanks

Jonathan

simonineaston wrote: ↑14 Jan 2023, 8:56pm Ah-ha - the old, "When is a screw a bolt?" debate... why d'you think I used pop rivets?

: - )

But did you spot the confusion about open and closed and blind rivets?

All pop (and indeed POP®) rivets are blind but some are blind and open and others are blind and closed.

Jonathan

Aaaaaarrrrggghhh... !!

wirral_cyclist wrote: ↑14 Jan 2023, 8:42pm I think this thread might drift into lamp/bulb territory with those that know using the correct term and everyone else the popular albeit wrong term...

It's an interesting comparison. I sometimes choose to use those terms in the narrower sense when I think it might be useful. But I wouldn't describe the narrower uses as correct or wrong...

The strange thing about the screws/ bolts discussion is that some people are willing to assert absolute definitions despite the counterexamples being blatantly obvious. The comparison that I would draw is with English usage where some people desperately hold on to what they think they were taught at school. We've got a thread all about that!

Jonathan

Sorry everybody.

I only meant to go along with Mick F's system but I was cautious about saying "nuts and bolts". :oops:

Mick F wrote: ↑14 Jan 2023, 7:43pm Bolts are bolts, and screws are screws.
Bolts have "land" below the head and screws are threaded all the way up to the head.

Full stop.

Mick F wrote: ↑14 Jan 2023, 8:52pm Wood screws and other "fixing" screws are a different thing entirely.

Engineering wise, a screw is a screw and a bolt is a bolt .......... as I stated.

What would you call this fastener?



Thanks

Jonathan

Jdsk wrote: ↑14 Jan 2023, 9:16pm
What would you call this fastener?



Thanks

Jonathan

Fastener? That would be as much use as a chocolate teapot to hold two or more parts together.

?

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

Jonathan

That's a threaded locater pin that is.

It looks like a stud or stop, not for joining.
Locater pin. Thanks that makes sense

: - )

The supplier calls them "Slotted Head Part Threaded Set / Grub Screws (DIN 427)".

And DIN 427 refers to "Slotted headless screws with chamfered end".

But if the fully threaded./ partly threaded definition were valid what name would it generate?

Jonathan

Jdsk wrote: ↑14 Jan 2023, 9:51pm ?

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

Jonathan

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.

PH wrote: ↑14 Jan 2023, 10:14pm

Jdsk wrote: ↑14 Jan 2023, 9:51pm 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

Jdsk wrote: ↑14 Jan 2023, 10:28pm

PH wrote: ↑14 Jan 2023, 10:14pm

Jdsk wrote: ↑14 Jan 2023, 9:51pm 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

Show us how that would hold 2 parts together securely.

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

Jonathan