Umnumzaan o-ring

miso2

miso2

Joined
Nov 19, 2014
Messages
2,633
Hi all,

I plan to but some o-rings for my Umnumzaan and found a o-ring provider in my country.
I would appreciate it if someone, who has replaced the o-rings, can verify that the o-rings used on Umnum's thumblugs are "P-3" in size (0.075" thickness 0.11" innerdiameter).
Thank you!



Miso
 
That is what mine measures..you should be good to go :thumbup:
 
Mad_Maxx said:
where can i find some? eu or usa? even coloured ones
or does chris sell them?
Click to expand...


You can find some in Amazon, but I don't know whether it is the case in EU.

One thing I am not sure now is the material.
If I remember correctly, the original o-rings are polyurethane.
I found polyurethane o-rings but also found a description that this material is not durable in water (or moisture).
Seems like hydrogenated nitrile (HNBR) is comparable to urethane in pressure-resistance but more stable in various conditions.
I will give it a try later.


Miso
 
I am using these and they work great. They make the lockup so quiet I have to look every once in a while to see if the knife is locked, it always is.
 
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