Reply With QuoteO rings are sized on bore not O/D...If its German its almost certain its Metric and thus 1.6x3.7 would appear to be very close.
Registered User
I need to replace an o'ring on my HW100 which is impossible to identify. The old one measures 6.95mm OD and is 1.75x1.56 wide.
I'm guessing a 7.0 x 1.75mm would probably fit - just wondered if any o'ring specialists would agree with my guess?
Nothing is enough for the man to whom enough is too little.
Lost love child of David Niven and Victoria Beckham
O rings are sized on bore not O/D...If its German its almost certain its Metric and thus 1.6x3.7 would appear to be very close.
Mushroom Man
If you know where it came from you should be able to find the size from some of the posts that give a list of all the HW100 O rings ... or try a google search for HW O ring sizes.
Cheers, Phil
Registered User
Originally Posted by harvey_s
Excellent! Didn't realise that. Thanks.
Nothing is enough for the man to whom enough is too little.
Registered User
I've tried all that and more. It is the o'ring inside the air cylinder's inlet valve by the manometer.If you know where it came from you should be able to find the size from some of the posts that give a list of all the HW100 O rings ... or try a google search for HW O ring sizes.
Cheers, Phil
Nothing is enough for the man to whom enough is too little.
Mushroom Man
If you do a net search for O rings you can find a complete list of O ring sizes in imperial and metric sizes ... as above, O rings are sized by the id and the diameter of the rubber making the ring. A common imperial rubber ring is made from 1.78mm rubber. Rings then are coded according to size. So, for instance, the loading probe for a Daystate .177 pcp is a BS003 size. Google BS003 and you find the ring. Or you should be able to find your code size from looking through the list as above.
Cheers, Phil
Admin Team
Would that be this one:
O-ring HW 100, 2.57 x 1.78 (PUR70) recommended Main valve inlet 2665D
Commonly known as BS005.
From here: http://weihrauchowners.freeforums.or...aks-t5300.html
?
Admin Team
Ah, no - I think I see what you mean now... inlet valve not main valve inlet...
2703B - from here?: http://weihrauchowners.freeforums.or...=860&mode=view
That's BS005 as well.
Last edited by Rickenbacker; 31-03-2017 at 08:06 PM.
Admin Team
Is that still wrong? It is, isn't it...
Registered User
Well, it's a tricky business trying to get the definitive code number. I think stripping air cylinders is not something manufacturers are happy to promote- hence the lack of available info.Is that still wrong? It is, isn't it...
Thanks for all your efforts though, much appreciated.
Nothing is enough for the man to whom enough is too little.
Admin Team
No worries, I didn't think it would be tricky to find out to be honest.Well, it's a tricky business trying to get the definitive code number. I think stripping air cylinders is not something manufacturers are happy to promote- hence the lack of available info.
Thanks for all your efforts though, much appreciated.
It must be annoying. I mean, an inlet valve seal isn't exactly unusual to need replacing...
Hope you get it sorted out.
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