O-Ring dimensions UW Housings generally

[Muellema]

Hi all,

 

current looking for spare O-rings for the Vacuum Valve for my Nauticam housing. Nauticam charges 15,-€ for this part. Which is a rip-off from my point of view.

May be we can open a topic where everybody who knows dimensions of O-Rings for UW housings will share his knowledge . So we can buy this parts manufacturer independent. My focus here is NOT mainly the big housing O-rings (would be nice too), but O-rings for accesories, ball mounts, threads, valves, flash sockets......

 

Br Markus

[Kraken de Mabini]

Yes, you are quite right in speaking out about the high cost -"rip-off" - of O-rings.

 

Some O ring replacement options are discussed here:

https://wetpixel.com/forums/index.php?/topic/69152-orings-for-sea-and-sea/&tab=comments#comment-437649

 

When replacing an O-ring, it is useful to keep in ming that all underwater equipment O-rings are metric (except Ikelite), and while most are made of "nitrile" rubber, some are "silicone".  Replacements must also be metric, but at times one can replace a silicone O ring with a nitirle one.

 

An O-ring size is described by its inner diameter and ring cross-section, in millimeters. It is best measured with a metric caliper, but a metric ruler may serve. 

It can be a bit difficult to measure the i.d. of a large O-ring.  One trick is with a drawing compass, to draw a series of concentric circles about the inner diameter of the O ring, then overlay the O ring on the circles until the drawn circle matches the I.D. of the O ring. 

 

Replacement metric nitrile O-rings can be found at The O-Ring Store, Backscatter Underwater Photo, eBay, Amazon, or thru a web search.  The price of a given O ring may vary widely, depending on the seller. For years I have bought from The O-Ring Store. 

 

Good luck!

https://www.theoringstore.com/

https://www.backscatter.com/search?keywords=O ring

Edited June 15 by Kraken de Mabini

[bvanant]

The o-ring store has a tool (https://www.theoringstore.com/store/index.php?main_page=index&cPath=345) called Olypsys that lets you measure unknown o-rings pretty accurately. A good digital caliper (english or metric) will get you cross section pretty well.  Also remember that not all o-rings from Japanese companies are metric sizes, many are JIS. 

Cheers,

Bill

 

[Kraken de Mabini]

Should anybody need a Japanese O ring, the chart is here:

https://www.marcorubber.com/downloads/marco-o-ring-size-chart-japanese.pdf