finding a new cotter pin?

#1
I managed to mangle the cotter pin that holds the coupling to the input shaft on my P6 power steering box, and now I'm having a difficult time finding a replacement. All I find online are split pins (USA call them cotter pins it seems) or cotter pins for bicycle pedal cranks. Does anyone know of a source for replacements?
Thanks in advance for any ideas! IMG_20201113_121618.jpg
 
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#3
Hundreds of them on ebay
yup.....none of them the right size! mostly metric, some for vintage British motorcycles. eBay was the first place I looked. I was hoping to find a supplier of old machine parts, vintage engineering kind of thing. I will keep trawling eBay though.
 

quattro

Administrator
Staff member
#4
My mistake, I thought you were looking for a split pin. 'Cotter pin' seems to cover a few different items, including as you say, split pins, roll pins and even clevis pins.

Do you know what size you are after?

I can't see your attachment btw
 
#5
Hi, I've tried to repair my post with the attached image, no idea why that disappeared!
The pin is 0.312" diameter and 0.9" long over the non-threaded part, 2.55" long overall. I thought it might be a standard part but even Machinery's Handbook is vague on these!
 

Gargo

Active Member
#6
Your pin looks to be mostly ok, is it just the threads which are 'mangled'?
In which case you should be able to chase the threads with a thread chaser.
McMaster-Carr
They can be pricey but your local engineering shop maybe able to help; but usually they'll charge the price of buying the tool. :pbuy tools....

good luck.
 
#7
What doesn't show in my pic is that the threaded part is bent backwards at the point where it joins the plain portion, I would worry that it is stressed there and might fail in service. It's probably not that bad really and I have some thread cutting dies so that might be worth a try.
 
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