Whitworth bolt needed

Lim

Hi,

I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The seapost
clamp uses a Whitworth threaded bolt, correct? No common bicycle related
bolt I have fits.

Where can I get one? What are the thread dimensions?

Many thanks for your time,
sc

Phil Brown

>
>Where can I get one? What are the thread dimensions?

Find the local British motorcycle shop.
Phil Brown

John Everett

On Sun, 4 Apr 2004 15:10:40 +0800, "Lim" <kiamkan@yahoo.com> wrote:

>Hi,
>
>I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The seapost
>clamp uses a Whitworth threaded bolt, correct? No common bicycle related
>bolt I have fits.
>
>Where can I get one? What are the thread dimensions?

As an old British sports car nut I though, "This should be easy". It
isn't.

I tried a google search for "whitworth fasteners" and came up with a
number of hits, none of which panned out. Finally tried the UK Google
and found:

http://stigfasteners.bizland.com/BSFtoBSW.chtml

If you're really desperate give them a try. It might be a pain dealing
across the pond but at least they list a range of BSW fasteners.


jeverett3<AT>earthlink<DOT>net http://home.earthlink.net/~jeverett3

Phil Brown

>As an old British sports car nut I though, "This should be easy". It
>isn't.
>
>I tried a google search for "whitworth fasteners" and came up with a
>number of hits, none of which panned out. Finally tried the UK Google
>and found:
>
>http://stigfasteners.bizland.com/BSFtoBSW.chtml
>
>If you're really desperate give them a try. It might be a pain dealing
>across the pond but at least they list a range of BSW fasteners.

Too complicated. I had a Raleigh Pro with a missing Whitworth Allen bolt . The
local Brit motorcycle shop-Casey's in Pacoima-had a whole box of misc. bolts.
The one I needed was a very common bolt used to hold primary cases togeather on
Triumphs, BSAs and other Brit bikes.
phil Brown

A Muzi

Lim wrote:

> Hi,
>
> I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The seapost
> clamp uses a Whitworth threaded bolt, correct? No common bicycle related
> bolt I have fits.
>
> Where can I get one? What are the thread dimensions?

Is that the one with a allen bolt which threads into the
seatlug itself? We have those in a Whitworth 55 degree
thread 24G, diameter 7.8mm = 0.306 inches which drive with
an SAE 9/32" allen key. Is that it?

Many riders had the frame threads cut to 8mm metric. Not a
bad idea.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Zog The Undeniable

Lim wrote:

> Hi,
>
> I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The seapost
> clamp uses a Whitworth threaded bolt, correct? No common bicycle related
> bolt I have fits.

I got a piece of 1/4" Whitworth threaded rod from a fastenings supplier
last year. Whitworth is still used for some applications, camera tripod
fixings in that particular size.

Incidentally, it was the first standard thread - fixings before
Whitworth were made so that nuts would only fit onto bolts supplied at
the same time. If memory serves the thread angle is 60 deg.

Phil Brown

>
>I got a piece of 1/4" Whitworth threaded rod from a fastenings supplier
>last year. Whitworth is still used for some applications, camera tripod
>fixings in that particular size.

My tripods are 1/4-20.
Phil Brown

A Muzi

> Lim wrote:
>> I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The
>> seapost
>> clamp uses a Whitworth threaded bolt, correct? No common bicycle related
>> bolt I have fits.

Zog The Undeniable wrote:
> I got a piece of 1/4" Whitworth threaded rod from a fastenings supplier
> last year. Whitworth is still used for some applications, camera tripod
> fixings in that particular size.
> Incidentally, it was the first standard thread - fixings before
> Whitworth were made so that nuts would only fit onto bolts supplied at
> the same time. If memory serves the thread angle is 60 deg.

You make a good point , Whitworth is an historically
significant standard.
55 degrees and curved (not pointy) at the root

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Sheldon Brown

An anonymous Yahoovian wrote:

>> I need a new seatpost clamp bolt for my 1970's Raleigh Team 753. The
>> seapost
>> clamp uses a Whitworth threaded bolt, correct? No common bicycle related
>> bolt I have fits.
>
A fellow Yahoovian using the alias "Zog the Undeniable" wrote:

> I got a piece of 1/4" Whitworth threaded rod from a fastenings supplier
> last year.

If memory serves, the Yahoovian who goes by "Zog" is U.K. based, and it
wouldn't surprise me if such a thing were to be available in That
Sceptred Isle.

However, I also surmise that the O.P. is _not_ from the U.K. (if he or
she was, it's unlikely that the dififculty would have arisen.)

> Whitworth is still used for some applications,

This might be true, for all I know.

> camera tripod fixings in that particular size.

That's not correct. Camera tripods use S.A.E. threads. In the U.S.,
they use the ubiquitous 1/4-20 size. In much of Europe they use the
3/16-20 size.

> Incidentally, it was the first standard thread - fixings before
> Whitworth were made so that nuts would only fit onto bolts supplied at
> the same time.

That's correct. See the Whitworth entry in my Bicycle Glossary for more
on Sir Joseph Whitworth, one of the great tech guys of the 19th century.

> If memory serves the thread angle is 60 deg.

Nope, 55 degrees. S.A.E. and standard Metric are 60 degrees.

Italian bicycle threading is also 55 degrees, being a sort of hybrid
between Whitworth and metric (Metric diameters, Whitworth thread pitch
and angle.)

Sheldon "Not To Be Confused Witn Isambard Kingdom Brunel" Brown
+-----------------------------------------------+
| I'll be appearing as Preposteros in |
| Gilbert & Sullivan's Thespis at M.I.T. |
| April 9-10,15-17 http://web.mit.edu/gsp/www |
| http://sheldonbrown.com/music.html |
+-----------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
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Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Ryan Cousineau

In article <c5e8b7$pok$1@lust.ihug.co.nz>,
"DRS" <drs@removethis.ihug.com.au> wrote:

> Sheldon Brown <CaptBike@sheldonbrown.com> wrote in message
> 407AA284.9050300@sheldonbrown.com
> > Benjamin Weiner wrote:
> >
> >> British motorcycles?
> >>
> > Is there still a British motorcycle industry?
>
> http://www.triumph.co.uk/site/intro.cfm

I knew someone would post that.

Note that those bikes use all metric fasteners. There probably isn't an
SAE bolt in the whole line, and there definitely isn't a BSW bolt.

That said, the British motorcycle (and presumably car) restoration
industry soldiers on, and besides antiques there is probably still a few
misbegotten 50-year-old remnants of the British industrial heyday in
sufficiently regular use that BSW bits are still available:

http://attiwill-industrial.straight...304/Productlist
..phtml

And then there's the still-in-production Enfield Bullet, which, if I'm
interpreting this correctly, may use metric, SAE, and BSW bolts:

http://www.cybersteering.com/cruise...let/maint2.html

--
Ryan Cousineau, rcousine@sfu.ca http://www.sfu.ca/~rcousine/wiredcola/
President, Fabrizio Mazzoleni Fan Club