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by **returntosender** on Sun Mar 10, 2013 7:37 pm

Hey guys,
I'm restoring some railroad signals and i need help with a bolt type
See the pics below but basically it's a bolt with 2 different size threads, I cant find it anywhere online or in stores.
Just wondering if there's a " Technical" name for it.
Thanks everyone :hello:

http://i481.photobucket.com/albums/rr17 ... 680487.jpg
http://i481.photobucket.com/albums/rr17 ... 427a6d.jpg

by **Magnetboy** on Sun Mar 10, 2013 7:40 pm

Interesting bolt. Probably made for it's specific application at the time of manufacture and unavailable elsewhere now would be my first guess. You might just have to buy a bolt with the same length and the larger thread. Then have a machinist turn the end of the bolt down in a lathe and re-thread it with the smaller threads.

by **Troy** on Sun Mar 10, 2013 7:52 pm

I know they refer to a bolt with different sizes as a "shoulder bolt" or "shoulder screw" but I've never seen one threaded all the way like that. Usually the shoulder or top portion in blank and the smaller diameter is threaded.

by **2070** on Sun Mar 10, 2013 7:54 pm

Since you have the signal, I would think you could look online for their part(s) numbers.

I am guessing it is for aiming and is mounted in the base??? :scratch:

by **LarryC39** on Sun Mar 10, 2013 8:57 pm

Neat!

by **returntosender** on Sun Mar 10, 2013 10:30 pm

2070 wrote:Since you have the signal, I would think you could look online for their part(s) numbers.

I am guessing it is for aiming and is mounted in the base???

Was that a lucky guess or do you know a little something about rail signals LOL ?
And yes its for aiming the signal
I did send a email to the manufacture late last week but have gotten no response yet

by **returntosender** on Sun Mar 10, 2013 10:47 pm

Troy wrote:I know they refer to a bolt with different sizes as a "shoulder bolt" or "shoulder screw" but I've never seen one threaded all the way like that. Usually the shoulder or top portion in blank and the smaller diameter is threaded.

Thanks ill have a look for them

by **Crunge98** on Mon Mar 11, 2013 7:34 am

Magnetboy wrote:Interesting bolt. Probably made for it's specific application at the time of manufacture and unavailable elsewhere now would be my first guess. You might just have to buy a bolt with the same length and the larger thread. Then have a machinist turn the end of the bolt down in a lathe and re-thread it with the smaller threads.

The Lathe can do the threading also

by **Magnetboy** on Mon Mar 11, 2013 10:08 am

Crunge98 wrote:
Magnetboy wrote:Interesting bolt. Probably made for it's specific application at the time of manufacture and unavailable elsewhere now would be my first guess. You might just have to buy a bolt with the same length and the larger thread. Then have a machinist turn the end of the bolt down in a lathe and re-thread it with the smaller threads.

The Lathe can do the threading also

Isn't that what I just said? :roll:

by **Crunge98** on Mon Mar 11, 2013 10:11 am

In a way

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