Braze-on thread size

[Will Cove]

Is there a standard thread size for braze-ons for bikes made in (say) the
last ten years? If there isn't a single size, is there a common series?

I'm asking because I've just bought a bottle cage for Mrs Cove's bike and
the plastic screws that came with it are too small in diameter for her
braze-ons. So I'm left hunting around for a couple of cap screws and
wishing I had a "come in handy" tin of miscellaneous fasteners. If I know
which threads are likely, I can make up such a pack by visiting my local
fastener specialist.

 

[Peter Clinch]

Will Cove wrote:
> Is there a standard thread size for braze-ons for bikes made in (say) the
> last ten years? If there isn't a single size, is there a common series?

*Usually* M5 IIRC, but FSVO "usually". For some bizarre reason known
only to EBC[1], the braze-ons on my '97 Contour 400 are all some weird
imperial size: fortunately the mech workshop here is well supplied with
legacy screws, nuts and bolts!

If not M5 they /should/ be "Mn" where 'n' is an integer and I'd be
surprised if outside the range 3-6 for this. These are pretty much
standard these days, though as above "should" and "are" aren't always
quite the same.

Pete.

[1] I suspect along the lines of "we've found this big box of old braze
ons... I know, we can stick them on the MTBs as nobody puts and racks
and guards on them!"
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email protected] http://www.dundee.ac.uk/~pjclinch/

 

[Will Cove]

Peter Clinch <[email protected]> wrote in
news:[email protected]:

>> Is there a standard thread size for braze-ons for bikes made in (say)
>> the last ten years? If there isn't a single size, is there a common
>> series?
>
> *Usually* M5 IIRC, but FSVO "usually".

Thanks - appreciated.

 

[Paul - xxx]

Will Cove <[email protected]> typed:
> Is there a standard thread size for braze-ons for bikes made in (say)
> the last ten years? If there isn't a single size, is there a common
> series?
>
> I'm asking because I've just bought a bottle cage for Mrs Cove's bike
> and the plastic screws that came with it are too small in diameter
> for her braze-ons. So I'm left hunting around for a couple of cap
> screws and wishing I had a "come in handy" tin of miscellaneous
> fasteners. If I know which threads are likely, I can make up such a
> pack by visiting my local fastener specialist.

What Pete C said ...

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=14216&ts=45816

What I use ...

--
Paul - ***

 

[Rob Morley]

In article <[email protected]>, Will Cove
[email protected]se says...
> Is there a standard thread size for braze-ons for bikes made in (say) the
> last ten years? If there isn't a single size, is there a common series?
>
> I'm asking because I've just bought a bottle cage for Mrs Cove's bike and
> the plastic screws that came with it are too small in diameter for her
> braze-ons. So I'm left hunting around for a couple of cap screws and
> wishing I had a "come in handy" tin of miscellaneous fasteners. If I know
> which threads are likely, I can make up such a pack by visiting my local
> fastener specialist.
>
Usually M5x0.8 for bottle bosses, mudguard/rack eyes etc. M6x1 for
brake bosses, dynamo brackets ...