7mm 0-Rings

Post by 8ace

I have found this site which has a large selection of O-rings and i think i have found a replacment MGC 7mm piston

Website:
http://www.mcmaster.com/

Part number
93125K13

Price:
$7.17 per 100

These replacement pistons sound interesting, good find 8ace !

Altec in the UK are a good source of 7mm o-rings too
I had posted part numbers for them on here ages ago after following up on somebody else's link.
I can't find the post again but I'll dig out the part numbers and order references for you.

Cerwyn
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Hobby collector of mainly WW2 era uniforms, headgear, field equipment and replica weapons.

Post by GZ22

I couldn't find the post but I found the original link for you fellas:

http://www.altecweb.com/home.asp?cat=RangeB05

Post by Phil_D

Hmmmm there seems to be a lot of choices on material types, has anyone tried anything other than the Nitrile ones (which arent recommended for high temps anyway)

I might give those silicon ones a try, nice bright orange rings, pimp up my cartridges
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Too many to list now and the collection has stopped still growing.

The Nitrile O rings I bought from Altec have proven perfectly suitable so far. It'd be interesting to see if the silicone ones need less grease for lubrication though. It'd be one job less to worry about when loading up!

Part numbers are:

7mm Nitrile Part No: ORN - BS006 Stock Items in packs of 50

5mm Nitrile Lot No: 134 - 8883 Special Orders in packs of 100 (unless they've decided to stock these too now.

The 7mm rings were very inexpensive lasttime I bought them, far less than the 25pence each being charged elsewhere. I can't remember exactly how much they were now, about 5pence each I think.

As the 5mm ones weren't stock items they were more expensive.

Give these a try, see what you think

Cerwyn
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Hobby collector of mainly WW2 era uniforms, headgear, field equipment and replica weapons.

Post by 8ace



Thanks for the part numbers Cerwyn and i have ordered some silicone ones to see what they are like.

Post by 8ace

I have tried the silicone O-rings

The bad news is that while they work, they do have a tendency to come off the piston. I don’t know if it is the size (slightly different to the normal ones) or it is the material but they damage easier.

The problem is that you can get the normal O-rings but you can't get silicone ones in the exact same size, which makes a comparison difficult

If anybody would like 47 silicone O-rings to try let me know and I’ll ship them out.

8ace