Cinelli 1R bar clamp bolt
Cinelli 1R bar clamp bolt
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
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
Mick F. Cornwall
Re: Cinelli 1R bar clamp bolt
"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?
Re: Cinelli 1R bar clamp bolt
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.
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.
Mick F. Cornwall
Re: Cinelli 1R bar clamp bolt
sometimes called a chipboard screw. Not sure if this is the correct term though.Jdsk wrote: ↑25 Jul 2021, 4:09pm"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?
Looks like MickF is looking for a M7 x 0.75 cap screw. Not a common size so good luck hunting.
Last edited by rjb on 25 Jul 2021, 4:28pm, edited 1 time in total.
At the last count:- Peugeot 531 pro, Dawes Discovery Tandem, Dawes Kingpin X3, Raleigh 20 stowaway X2, 1965 Moulton deluxe, Falcon K2 MTB dropped bar tourer, Rudge Bi frame folder, Longstaff trike conversion on a Giant XTC 840
Re: Cinelli 1R bar clamp bolt
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
Re: Cinelli 1R bar clamp bolt
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.
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.
Mick F. Cornwall
Re: Cinelli 1R bar clamp bolt
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.
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. Cornwall
Re: Cinelli 1R bar clamp bolt
OED
set screw
noun
a screw for adjusting or clamping parts of a machine.
Look up "bolt" if you want.
set screw
noun
a screw for adjusting or clamping parts of a machine.
Look up "bolt" if you want.
Mick F. Cornwall
Re: Cinelli 1R bar clamp bolt
I’d call it a pozi countersunk wood screw.
What do you @jdsk call it?
MickF is correct he needs a socket head screw.
What do you @jdsk call it?
MickF is correct he needs a socket head screw.
Whatever I am, wherever I am, this is me. This is my life
https://stcleve.wordpress.com/category/lejog/
E2E info
https://stcleve.wordpress.com/category/lejog/
E2E info
Re: Cinelli 1R bar clamp bolt
Thanks. Me too. Everyone calls things like that screws.
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
Last edited by Jdsk on 25 Jul 2021, 4:55pm, edited 1 time in total.