McMaster Keg O-Ring List

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olie

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I've been trying to find the little red O-rings that fit inside my 1/2" quick disconnects. By my eyeball measurement, they're 13/16" OD and 1/8" thick (so 11/16" ID), but I could be off, as I'm just using a metal tape measure.

Anyone got a part# for that?

It's the O-ring in this picture:
611jUl63thL._SX425_.jpg


Thanks!
 

day_trippr

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they're 13/16" OD and 1/8" thick (so 11/16" ID),
fwiw, if they are indeed 13/16" OD and 1/8" thick the ID should actually be 9/16.
If they were 1/16" thick then the ID would be 11/16"...

Cheers!
 

olie

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fwiw, if they are indeed 13/16" OD and 1/8" thick the ID should actually be 9/16. If they were 1/16" thick then the ID would be 11/16"...
Right. I knew that... :) D'oh!

Now that I'm looking with a better ruler, they appear to be 7/8" (14/16), and still 1/8" thick, for an ID of 5/8" (because: -1/8 on each side <G>)

But, really, that's just me eyeballing it against a ruler. The important thing is: it's the washer that goes on the inside of the female 1/2" QD, as pictured above.
 

phreaky

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PIN LOCK POST O-RING SOLVED!!!

Okay, sorry for the yelling above, but I wanted to get your attention. After I switched my gas lines to reinforced lines and beer lines to 3/16” BevSeal (no more beer tasting like water from a garden hose), I developed frequent gas leaks and occasional beer leaks. The reinforced gas lines and BevSeal are much stiffer than the beer/gas lines most use, which caused the fitting to torque and twist. After losing several tanks of CO2, reading this entire post several times and many other posts, I decided to take a hit for the team. Here is what tried:

No. 1. -112 BUNA
No. 2. -112 Silicone
No. 3. 10mm (ID) X 16mm (OD) X 3mm (Diameter) Silicone
No. 4. 12mm (ID) X 17mm (OD) X 2.5mm (Diameter) Silicone
No. 5. 12mm (ID) X 18mm (OD) X 3mm (Diameter) Silicone
No. 6. 10mm (ID) X 17mm (OD) X 3.5mm (Diameter) Silicone

I decided to go with 10mm (ID) X 16mm (OD) X 3mm (Diameter) Silicone for the beer post and 12mm (ID) X 18mm (OD) X 3mm (Diameter) Silicone for the gas post. The inside diameter of Nos. 1 & 2 were too big. The 2.5mm diameter of No. 4 was too small for the groove, and I did not get a snug connection. The 3.5mm diameter of No. 6 was just too thick to fit in the groove.

No. 3 works well on the beer post; it takes a little stretching, but is nice and snug. No. 5 on the gas post is downright tight and takes a little wiggling to get it off. It may be too tight for some. I did not try 11mm (ID) X 17mm (OD) X 3mm (Diameter) Silicone because I could not find them in small quantities, but it is right between the two and may be just right. I also don’t know how well BUNA would work. It seems less stretchy to me and might make No. 3 too hard to get on the post and No. 5 too hard to get the connector on post. I’ll leave it someone else to try BUNA and 11mm (ID) X 17mm (OD) X 3mm (Diameter) Silicone.

I ordered small quantities on Amazon from here:
http://www.amazon.com/dp/B008MKXQ9M/?tag=skimlinks_replacement-20 (10 pcs. for $3.49 - 10mm (ID) X 16mm (OD) X 3mm (Diameter) Silicone)
http://www.amazon.com/dp/B008ASY3Y8/?tag=skimlinks_replacement-20 (10 pcs. for $3.47 - 12mm (ID) X 18mm (OD) X 3mm (Diameter) Silicone)
Larger quantities (and the 11x17x3 in silicone) can be purchased at http://www.oringsandmore.com/.

I welcome others to carry the torch from here and post their results. I’ve also attached a few photos.
No. 5 is on the left, a BUNA -111 (agreed ball lock size) in the middle, and No 3 on the right.

View attachment 179689

View attachment 179690

View attachment 179691

To follow up this post, I'm going through replacing all of my o-rings in my pin lock kegs. I frequently had the same issue with a little bit of side pressure on the gas disconnect causing a slight leak, so I wanted to try these out. I ended up with the 10x3mm for liquid outs, and 11x3mm for the gas outs. I as able to find them at http://www.oringsandmore.com for pretty cheap since I couldn't find the 11mm on Amazon.

Liquid post: http://www.oringsandmore.com/silicone-o-rings-10-x-3mm-price-for-10-pcs/
Gas post: http://www.oringsandmore.com/silicone-o-rings-11-x-3mm-price-for-10-pcs/

I've also always had a problem using the -109 rings for the diptubes. They always sealed ok, but the first time you would remove the post, the dip tube ring would be chewed up and usually split in two from the threads. I found these to help with that, and they seem to work a bit better: http://www.oringsandmore.com/x-rings-size-109-price-for-10-pcs/

Add in a few packs of the lid o-rings from Amazon, and a 100 pack of universal poppets from Aliexpress, and I've got the parts to completely rebuild 50 kegs for around 80 bucks. I've made it through about 18 of my 30 kegs, and so far all of them are working great.
 

olie

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Btw, it took me since my Oct 2017 post above, but I finally found these! Turns out it's a metric size, and the answer is it's this one:


Now you know, too! :)
 

Tobor_8thMan

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Now if we can just determine the O ring size for the Chugger stainless steel classic pump head. No, it's not the same as the March pump O ring.

Also, the links in the original post. Are any of these food grade? I see no mention or indication of food grade when I check the link in the OP.
 

mkyl428

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Not sure if this is already been asked somewhere in this thread, but does anyone know the McMaster-car part numbers for replacement o-rings for the SS Brew bucket racking arm, and ball valve?
 

Spartan1979

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Not sure if this is already been asked somewhere in this thread, but does anyone know the McMaster-car part numbers for replacement o-rings for the SS Brew bucket racking arm, and ball valve?
Don't buy the same ones. Buy ones that are a little thicker and they're a lot less fussy. The actual size of the SS Brewtech ones are listed in the description on their webpage.
 

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