inernal size of 2.5mm nuts?

peterbunce

peterbunce

1880's Colorado Narrow gauge on 45mm track
Hi,

I am working towards a new bridge that will use 2.4mm welding rods, for the vertical and horizontal tension rods, has anyone a measurement for the inside (where the screw thread is ) of a 2.5mm metric thread nut  please? The actual size of the rods I believe is actually 2.3mm and I suspect will be variable to 2.4mm. 

I want to solder these to the top & bottom of the rods in due course so they need to be a reasonable sliding fit, though they could be drilled out a small amount, though there is about 170 of them!  

Got it wrong - -  the rods are 2.4, the nuts will be 2.5mm!  Changed the measurements over accordingly

Yours Peter.
 
Re:inernal size of 3.5mm nuts?

Sounds like a Q for Coyote97 :callme:
 
Re:inernal size of 3.5mm nuts?

Hi Peter,

mmmm....there is a problem: M3,5 is very unusual. and the measurement with down to 3,2 is a bit so-and-so, the 3,4 mm would be very ok for a M3,5.
But as far as i know M3,5 is special and out of normed lists.

For more, a 3,4 mm rod is very thick upscaled, those rods are often in a diameter of 40 or 50 mm (what is for the heavy rods), what will make a 2 or 2,5 mm in scale.

I used welding rods, too. Take a look and try to find some with 2,9 or 3,0mm for an M3, what is very common.

One more:
soldering the nuts makes them quite unremovable...QUITE unremovable. For not too much money u will get "thread-fix", gluetype srew-saving gel.
Advantages: u just need a drop, u can remove the nut later on, and u dont have to fumble arround with a soldering iron near your pvc-bridge!!!


Greetings

Frank
 
Re:inernal size of 3.5mm nuts?

Peter,

have you thought about using bicycle spokes?

bruecke1-11.JPG
 
Re:inernal size of 3.5mm nuts?

Hi Korm,

Love to but they are not long enough and would be more expensive, I've looked and alas for this they wont work.

Thanks for the thought, Yours Peter.
 
Re:inernal size of 3.5mm nuts?

coyote97 said:
Hi Peter,

mmmm....there is a problem: M3,5 is very unusual. and the measurement with down to 3,2 is a bit so-and-so, the 3,4 mm would be very ok for a M3,5.
But as far as i know M3,5 is special and out of normed lists.

For more, a 3,4 mm rod is very thick upscaled, those rods are often in a diameter of 40 or 50 mm (what is for the heavy rods), what will make a 2 or 2,5 mm in scale.

I used welding rods, too. Take a look and try to find some with 2,9 or 3,0mm for an M3, what is very common.

One more:
soldering the nuts makes them quite unremovable...QUITE unremovable. For not too much money u will get "thread-fix", gluetype srew-saving gel.
Advantages: u just need a drop, u can remove the nut later on, and u dont have to fumble arround with a soldering iron near your pvc-bridge!!!


Greetings

Frank
Click to expand...

Hi Frank,

First I have made a mistake I fear it SHOULD be 2.4 and not 3.5 - double slapped wrists, and a doghouse for a while for me  :-)   :-(

Thanks for the input its appreciated, I can get 2.4 instead, which hopefully would give me more rods per packet,  as well.

The horizontal ones would have a washer behind; the vertical ones possibly a piece of my beer can aluminum as a strip?

I can get 2.5 brass nuts, and the thought is that being soldered they will with the rods act as the prototype and hold everything together.

Would the Loctite type stuff survive weather for a long time? I could use that at one end with a soldered join at the other, thus the rods could be removed?



Yours (en route to the doghouse BUT I ain't goin' outside) Peter.
 
Re:inernal size of 3.5mm nuts?

Would the Loctite type stuff survive weather for a long time? I could use that at one end with a soldered join at the other, thus the rods could be removed?
Click to expand...



Yes, that stuff stands weather. U have it on many parts of car-automotive, too.

The idea is good: soldering a "long screw" and then just fix one side with loctite....ok!


Frank
 
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