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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/28/2005 2:55:58 AM EDT
Aside from price, which is better and why? and where is a good source for the crane O ring?
Link Posted: 8/28/2005 3:31:42 AM EDT
Adco has them here is a link scroll down the page on left side.

Adco crane-o-ring
Link Posted: 8/28/2005 3:41:05 AM EDT
dont pay for over priced o-rings, just go to home depot and get the #6 or #60 o-rings. the difference would be the brand or sometimes the store.
Link Posted: 8/28/2005 3:55:28 AM EDT
[Last Edit: 8/28/2005 3:56:36 AM EDT by mongo001]
There are better 0-ring materials that will hold up better and last longer. In a harsh environment, an O-ring designed for a water faucet may not hold up as well as one designed for a high pressure, high temperature hydraulic system. Having said that, the O-ring designed for a water faucet will fill the needs of 99% of the people here. I'd bet of the hundreds of O-rings installed by people here, only a couple dozen of them are actually doing anything. The other hundreds are installed for "insurance" and probably aren't even needed.

I've said this at least a dozen times - Crane very likely didn't spec out, design and build their own O-ring - they went to the parts depot and asked for a bunch of mil-spec O-rings of various sizes and tried them until they found one that fit their needs. I'd bet money on it. The package they come in probably say something like"O-ring, hydraulic, 100ea".

"Crane O-ring"...........................
Link Posted: 8/28/2005 5:05:27 AM EDT
Link Posted: 8/28/2005 5:10:46 AM EDT
[Last Edit: 8/28/2005 5:11:38 AM EDT by eklikwhoa]
i use the d-fender that comes with my mgi rate reducing buffer and feel that it holds up much better than any o-ring.

have about 5-6k on one of them and with a shot of brake cleaner it looks brand spankin new

twl is a mgi rep/dealer here and you can find him in the equipment exchange
Link Posted: 8/28/2005 5:22:44 AM EDT
Link Posted: 8/28/2005 5:38:06 AM EDT
per an email conversation with the SOPMOD manager at Crane. They DID have an O ring specially made for them, after testing various off the shelf O-rings, but now consider their special made O Rings and the D-fender to be interchangable.
Link Posted: 8/28/2005 5:49:43 AM EDT
[Last Edit: 8/28/2005 6:05:04 AM EDT by mongo001]

Originally Posted By PSYWAR1-0:
per an email conversation with the SOPMOD manager at Crane. They DID have an O ring specially made for them, after testing various off the shelf O-rings, but now consider their special made O Rings and the D-fender to be interchangable.



I will not completely doubt this, as I don't know, but of the milliions of O-rings out there, there wasn't one that fit their needs????? I'd bet they came up with a spec, submitted it to their purchasing experts, who went out and found what was needed. The chances of there NOT being an O-ring already out there that wouldn't fit their spec would be pretty slim. But, hey, who am I? I'm just some gun nut from MI.

I do know of a super O-ring that pretty much beats Viton or Buna or all the other standard, common O-rings in pretty much every category, but it cost $20 each. If I were SOPMOD and had the funding, which I believe they do, I'd be running those in mine. As it stands right now, I have the "Crane O-ring" in one of mine and it runs without issue. I also have another in which I'm running a Viton 007 X-ring in and it also runs without issue - McMaster Carr Search on Item Number 6540K117. They are backing a standard spring with a blue insert. These would be the exception to my norm of a Wolff extra power spring by itself. I'm bored and like to play.

Check out the Kalrez/Simriz/Chemraz specs here.

Here's a source for them - McMaster Carr - Search on Item Number 9568K11

You can also get them here for $1007 per hundred.
Link Posted: 8/28/2005 6:47:59 AM EDT
[Last Edit: 8/30/2005 9:21:48 PM EDT by gmtmaster]
I have one from ace hardware in my M16... It gets rosting hot, and cleaned with brake cleaner. Hasnt deteriorated yet....Ill order a real one the next time I need parts.. This one should make it in the short order though..



Link Posted: 8/28/2005 6:59:00 AM EDT
Read the entire scoop on Crane O-rings and the D-Fender here:

www.ar15.com/forums/topic.html?b=3&f=118&t=237471
Link Posted: 8/28/2005 6:47:20 PM EDT

Originally Posted By M4Madness:
Read the entire scoop on Crane O-rings and the D-Fender here:

www.ar15.com/forums/topic.html?b=3&f=118&t=237471





+1
Link Posted: 8/28/2005 8:18:00 PM EDT
The main difference between the O-ring and the defender is about $11.
Link Posted: 8/28/2005 11:51:32 PM EDT

Originally Posted By YELLOWV:
The main difference between the O-ring and the defender is about $11.





imo there is more but for most, yeah just 11$ is about all the difference they will notice
Link Posted: 8/30/2005 9:02:05 PM EDT

Originally Posted By eyxxx:
Aside from price, which is better and why? and where is a good source for the crane O ring?



I have a bunch of crane o rings. Wanted to compare to home depot o rings # 60 at 24 cents a piece , I squeezed them pushed on them pushed my finger nail into them , both felt the exactly the same .. Go buy number 60 o-ring a home depot it will work great and it costs 24 cents. The defender just made that guy a bunch of money thats it..
Link Posted: 8/30/2005 9:06:57 PM EDT
[Last Edit: 8/30/2005 9:08:29 PM EDT by YELLOWV]
Yes I'm sure squeezing them and pushing their finger nail into them were the tests that Crane used when choosing their O-Rings. Did you try heating them? Plus the Crane O-Ring costs a buck. I'm sure nobody is getting rich even if they are making 76 cents a piece.
Link Posted: 8/31/2005 3:36:13 AM EDT
i have done a few hundred round strings with the d-fender installed and after removing it to check it and a shot of brake cleaner and its brand new
Link Posted: 8/31/2005 3:53:58 AM EDT

Originally Posted By YELLOWV:
Yes I'm sure squeezing them and pushing their finger nail into them were the tests that Crane used when choosing their O-Rings. Did you try heating them? Plus the Crane O-Ring costs a buck. I'm sure nobody is getting rich even if they are making 76 cents a piece.



It retails for a buck, probably because that's the easiest denomination to charge. They probably wholesale for a nickel each................................really.
Link Posted: 8/31/2005 3:54:46 AM EDT
Link Posted: 8/31/2005 4:04:50 AM EDT
I went to Lowes and bought a few of the #60 o rings for .08cents each.

Then I tried them through a few local shoots. Worked well and held up ok. Didnt try any cleaners on them, didnt need them as of yet.

I went back and bought a small handfull for a couple bucks. I think I have a lifetime supply.

Link Posted: 8/31/2005 4:27:05 AM EDT
[Last Edit: 8/31/2005 4:34:12 AM EDT by twl]
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