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Posted: 8/24/2004 6:06:06 PM EST
Anyone know the correct O-ring size to use as an extractor helper (you know, like a "D-fender", etc.) Preferably the correct standard "dash number" from a chart such as this one:

www.marcorubber.com/sizingchart.htm

Thanks!
Link Posted: 8/24/2004 7:04:01 PM EST
That's a good question. I'd like to know that too as I work for an O-ring company. Yup, no kidding. O-rings pay for all my toys. Billion dollar a year business all for little (sometimes very big) o-rings.

Tagged.
Link Posted: 8/24/2004 9:54:37 PM EST
#60 0-ring, preferably made of Viton as it's more resistant to solvents.
Link Posted: 8/25/2004 1:23:33 AM EST
There is no "#60" on the chart at www.marcorubber.com/sizingchart.htm. That means I can't buy any, since none of the O-ring suppliers I am familiar with use anything except a chart like that. Can anyone identify what a "#60" is in terms of that chart? MK1iii, you're an O-ring pro , what do you say?
Link Posted: 8/25/2004 2:29:42 AM EST
Email me for a D-Fender, the "real thing".
Link Posted: 8/25/2004 6:40:15 AM EST
Wolf XP extractor spring!!
Link Posted: 8/25/2004 7:34:18 AM EST

Originally Posted By aa777888-2:
Anyone know the correct O-ring size to use as an extractor helper (you know, like a "D-fender", etc.) Preferably the correct standard "dash number" from a chart such as this one:

www.marcorubber.com/sizingchart.htm

Thanks!




Go to LOWES.......... they sell 10 pac for $1.29 I think it is, look around the faucet repair stuff.

Sears Hardware is another to visit, they come in single pacs, and the dimensions is both packs I think.
Link Posted: 8/25/2004 7:59:44 AM EST

Originally Posted By aa777888-2:
Anyone know the correct O-ring size to use as an extractor helper (you know, like a "D-fender", etc.) Preferably the correct standard "dash number" from a chart such as this one:

www.marcorubber.com/sizingchart.htm

Thanks!



As568A Dash Number 006

Go here McMaster-Carr and look at the following part numbers:

1201T16 Mil-Spec Viton O-Ring Pack of 50 $4.82

9396K11 Silicone O-Ring Pack of 100 $6.90

6540K116 Double-Seal Viton O-Ring Pack of 50 $10.24

HTH
Link Posted: 8/25/2004 8:32:02 AM EST
4mm ID Viton o-rings. Viton is the only way to go, conventional rubber o-rings will melt. Mine hasn't melted after 200 rapid fire rounds.

Got mine for free when I want to an o-ring warehouse. They only sold to distributors, but gave me a little sack of them. The guys there said the o-rings, Viton or not, are only pennies each. I felt guilty, so I bought them a box of Krispy Cremes.

http://www.ar15.com/forums/topic.html?b=3&f=118&t=192741
Link Posted: 8/26/2004 1:54:15 AM EST
Thanks, Gaijin, you da' man!
Link Posted: 8/26/2004 6:26:17 AM EST
[Last Edit: 8/26/2004 6:27:34 AM EST by otto_esq]
FYI on shipping costs for a 50 count package from McMaster-Carr

Even though the shipping is almost the cost of the O-rings, its still less than $.18 ea.
(And I have plenty of spares and some to give to friends)



Shipping Method
Best Method Available

Products
1Pack 1201T16 MIL-Spec Viton O-Ring As568A Dash Number 006, Packs of 50 $4.82 ships today

Merchandise $4.82
Shipping $3.75
Your credit card will be charged $8.57



Phone:(732) 329-3200 Fax:(732) 329-3772 Internet:www.mcmaster.com E-mail:nj.sales@mcmaster.com
Link Posted: 8/26/2004 7:08:20 AM EST
These things are magic. One of my AR10s was failing to eject every round... put in one of these rings and it works like a charm every time.
Link Posted: 8/26/2004 7:14:06 AM EST
Oh, by the way, the O-rings I ordered yesterday afternoon, after seeing this thread?

Well, McMaster-Carr chose the "Best Delivery Method" for my order, and they just arrived.

Excellent service. Too bad with the 50 I ordered, I don't think I'll need to deal with them again any time soon.

Cheers, Otto
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