Rear mech. What size is the thread?

[Darius_Jedburgh]

Does anyone know what size bolt fits in the rear mech opening? M10 is it, or something else?

 

[Ajax Bay]

Do you mean where it screws into the hanger/frame?
10x1 is the thread (10mm diameter and 1mm thread pitch)
So M10 x 1.0.

 

[midlife]

I'm sure the dropouts on the old frames were 10mm x 26tpi?

 

[Ajax Bay]

Aka 10mm x 25.4tpi
I don't know whether it's actually 25.4tpi or 26tpi.

 

[Darius_Jedburgh]

Yes. I'm thinking of having a frame powder coated and want to put a blanking plug in, but was unsure of the size.

 

[Darius_Jedburgh]

Any other suggestions for stopping the threads getting filled out with powder?

 

[Ajax Bay]

Same size as a rear axle (QR or nutted): I have a broken one I use (for rear mech aligment duties, not blanking).

 

[Darius_Jedburgh]

I'm sure the dropouts on the old frames were 10mm x 26tpi?

Aka 10mm x 25.4tpi
I don't know whether it's actually 25.4tpi or 26tpi.

Presumably in metric terms that is M10 x 1.00?

 

[midlife]

If the powder coaters do bike frames they have some special silicone plugs they use for the dropout and BB. Or as AJ says stick in a rear axle or an old bolt from a mech.

I've got a tap somewhere which was dirt cheap.

 

[Darius_Jedburgh]

Yes, thought of that but I haven't got an old mech lying around😢😢😢

 

[DRM]

What about one of those foam ear defenders that goes into the ear

 

[Darius_Jedburgh]

Won't the process destroy that and leave a residue on the threads?

 

[DRM]

Thinking about it, forget that, it’ll melt when it gets baked, I think in all honesty a bolt is needed, even if you have to buy one of those small packs with just a few in

 

[rogerzilla]

M10 x 1 is a rare bolt size. I bought a drain plug for a car to protect the rear mech thread on my Moulton while it's running as a fixie.

 

[Darius_Jedburgh]

M10 x 1 is a rare bolt size. I bought a drain plug for a car to protect the rear mech thread on my Moulton while it's running as a fixie.

I've found a supplier. £6 posted. Might ask around to see if anyone has a knackered mech that is only fit for the bin.