Rivets for step to mast

[pcatterall]

I want to use monel rivets. The steps are 2mm thick and I guess that the mast will be 2 or 3mm (?) so I think I need a rivet length of 6 or 8mm (?).
I can only locate ones with a minimum length of 10mm.
Would these work?

 

[Daydream believer]

Yes, you need the minimum 10mm
6mm would be too short
Best to be over length than under

 

[pcatterall]

Yes, you need the minimum 10mm
6mm would be too short
Best to be over length than under

Thanks. So the longer than required still deform OK?

 

[V1701]

Thanks. So the longer than required still deform OK?

Any "extra" length will not affect the deformation. Get yourself a really good gun if you're fitting mast steps...

 

[Daydream believer]

Thanks. So the longer than required still deform OK?

Yes.If too short the ball on the end will start to pull through the substrate before it swells the rivet, which has to do so on the inside of the mast, thus pulling the fitting inwards a small amount. You still have to make sure that the fitting is pushed tight to the mast first.
Practice on 2 washers, or even a stack of 4 first, to see what I mean

 

[Graham_Wright]

Make sure the steps are the right way up and not "ankle breakers".

 

[Tradewinds]

You can get 6.25 x 12mm monel (1/4" x 1/2") from Seascrew. Exorbitant price though esp with carriage added on.
On the recommendation of NormanE I bought this long-handled rivetter from Faithfull via Amazon. Eats them! Far, far easier than I was expecting.

https://www.amazon.co.uk/gp/product/B000X2ATYC/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

 

[pcatterall]

Any "extra" length will not affect the deformation. Get yourself a really good gun if you're fitting mast steps...

previous advice was thickness of the 2 metals plus 1.5x the pin thickness
I have been doing some trials. The top diagram used 10mm long rivets and the bottom diagram used 8mm
It looks like only the head of the 10mm rivet has deformed but the 8mm rivet head has deformed up against the inner metal and is less likely to pull through?