Cinelli 1R bar clamp bolt

[Mick F]

Mercian has a Cinelli 1R stem, and has done since forever.

Bought a secondhand bike years ago, frame and Campag bits and wheels all sold, but I kept the 1R stem .......... so I have two. The second one is fitted on Mrs Mick F's bike.

The one on Mercian has the socket rather worn where the 6mm Allen key goes in. The screw must be tight - very tight - and that is a disadvantage of the 1R compared to the 1A.
http://velobase.com/ViewComponent.aspx? ... 9&Enum=102
http://velobase.com/ViewComponent.aspx? ... B&Enum=102

Having used a cheap(?) Allen key set for years, the socket is worn. The stem has been on Mercian since I built it in 1986.
Screw is M7 with a fine thread and the thread is 14mm long.

As it's a screw, the thread is full, and therefore not a bolt where the thread isn't all the way to the head. Screws are fully treaded, and often called Set Screws.
Just thought I'd add that bit to put the record straight!

Off on a ride tomorrow (on Moulton - Ahead stem) and am calling in at Express Fixings Plymouth to see if they have a 7mm fine thread Allen full-thread screw. I'll be taking one with me as an example.
http://www.expressfixing.co.uk

[Jdsk]

As it's a screw, the thread is full, and therefore not a bolt where the thread isn't all the way to the head. Screws are fully treaded, and often called Set Screws.
Just thought I'd add that bit to put the record straight!

"There is no universally accepted distinction between a screw and a bolt."
https://en.wikipedia.org/wiki/Screw#Dif ... _and_screw

Jonathan

PS: What's this thing called?

[Mick F]

Universally accepted?
I have been and engineer of electronics, electrics, mechanical, and all sorts of stuff as well.

What people want to use "universally" these days doesn't alter the fact that engineering-wise a bolt is a bolt, and a screw is a screw.
Wood/other uses are different things entirely.

Any road up, this is besides the point.

I am hoping to find a SCREW that is a fine thread M7 socket head. Allen preferably but Torx would be ok too.

[Jdsk]

What people want to use "universally" these days doesn't alter the fact that engineering-wise a bolt is a bolt, and a screw is a screw.

What's the fastener in the picture above called, engineering-wise?

Thanks

Jonathan

[rjb]

As it's a screw, the thread is full, and therefore not a bolt where the thread isn't all the way to the head. Screws are fully treaded, and often called Set Screws.
Just thought I'd add that bit to put the record straight!

"There is no universally accepted distinction between a screw and a bolt."
https://en.wikipedia.org/wiki/Screw#Dif ... _and_screw

Jonathan

PS: What's this thing called?

sometimes called a chipboard screw. Not sure if this is the correct term though.

Looks like MickF is looking for a M7 x 0.75 cap screw. Not a common size so good luck hunting.

[Jdsk]

As it's a screw, the thread is full, and therefore not a bolt where the thread isn't all the way to the head. Screws are fully treaded, and often called Set Screws.
Just thought I'd add that bit to put the record straight!

PS: What's this thing called?

sometimes called a chipboard screw. Not sure if this is the correct term though.

I think that it's a wood screw, but you could be right. The point (!) of course being that no-one in any context calls it a bolt. Now look at how far up the thread goes and doesn't go...

Jonathan

[Mick F]

Pedantic .............

Bolts have screw-threads. Yes?
Screws have screw-threads as well?

Engineering ................

A bolt is a fastener with a head and a screw-thread but the "land " above the screw-thread is the same diameter as the thread major diameter. A screw has the thread all the way to the head.

[Jdsk]

A screw has the thread all the way to the head.

What do you call the thing in the picture, please?

Thanks

Jonathan

[Mick F]

Wood screw?
So what?

How about a cork screw ............. or a ship's propellor being called a screw?
Thousands of things with screw-threads ................. even bolts.

[Mick F]

OED
set screw
noun
a screw for adjusting or clamping parts of a machine.

Look up "bolt" if you want.

[Paulatic]

I’d call it a pozi countersunk wood screw.
What do you @jdsk call it?
MickF is correct he needs a socket head screw.

[Jdsk]

I’d call it a pozi countersunk wood screw.
What do you @jdsk call it?

A wood screw.

Jonathan

[Mick F]

MickF is correct he needs a socket head screw.

Thank you!

[Jdsk]

Wood screw?
So what?

Thanks. Me too. Everyone calls things like that screws.

As it's a screw, the thread is full, and therefore not a bolt where the thread isn't all the way to the head.

But by that definition it's a bolt not a screw as the thread isn't all the way to the head.

There's no argument about what the thing in the picture is called. It's the definition that's wrong. It does describe common and engineering usage for some types of fasteners, but not for all.

And the same is true of every other attempted definition of the difference... works in some cases, fails in others.

Jonathan

[KM2]

Try Kays for stainless bolts. Not sure of their stock