How do I read this O-Ring label?
- Thread starter rsfrid
- Start date
I would guesstimate 4.5 mm id and 1.5 mm ring thickness, so 7.5 mm OD
Though it do sound a tad small for a filler probe O-ring
3DN70 is probably that they are nitrile material
So something along these lines.
https://www.bdiexpress.com/us/en/Sealing-Devices/O-Rings-And-V-Rings/1-5-X-4-5MM-N70/p/24506586
Though it do sound a tad small for a filler probe O-ring
3DN70 is probably that they are nitrile material
So something along these lines.
https://www.bdiexpress.com/us/en/Sealing-Devices/O-Rings-And-V-Rings/1-5-X-4-5MM-N70/p/24506586
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4.5mm ID X 1.5mm cross section makes for an o-ring of 7.5mm diameter which is @ 5/16" od in SAE spec
IS THAT THE @ size of the o-rings in package ?
IS THAT THE @ size of the o-rings in package ?
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I have personally never seen any sizes given on o rings purchased from actual vendors of pcp parts or even eBay vendors. In fact, I’m surprised to see you got what you got in that sticky tag. It’s best to just pull out the calipers and measure but do so while thumbing thru an online o ring distributor like oringsandmore, so to make sure the size you come up with(especially the ID)is even listed in their catalog.
If the metric sizes aren’t found then it’s more than likely an imperial size as Motörhead suggested.
If your calipers don’t have a fractions feature but only decimal in inches, take the decimal equivalent and multiply by 16.
Say your calipers read .7165, multiply that by 16 which then equals 11.464. That says it’s 11/16”. If it would’ve been 11.564 and greater I round up to 12/16”, or 3/4 reduced.
If you want a more definite increment multiply by 32, which in this case the example of .7165 is now 22.928, or 23/32”. The goal here is to get to the closest in size you need, on a size that’s listed in a vendors catalog
If the metric sizes aren’t found then it’s more than likely an imperial size as Motörhead suggested.
If your calipers don’t have a fractions feature but only decimal in inches, take the decimal equivalent and multiply by 16.
Say your calipers read .7165, multiply that by 16 which then equals 11.464. That says it’s 11/16”. If it would’ve been 11.564 and greater I round up to 12/16”, or 3/4 reduced.
If you want a more definite increment multiply by 32, which in this case the example of .7165 is now 22.928, or 23/32”. The goal here is to get to the closest in size you need, on a size that’s listed in a vendors catalog
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This is correct. Metric Buna O-rings 4.5 x 1.5mm JIS S5
25 pack cost $1
https://www.oringsandmore.com/metric-buna-o-rings-4-5-x-1-5mm-jis-s5-price-for-50-pcs/
Order a lifetime supply of all the sizes you may need for less than $50 https://www.oringsandmore.com/metric-70-orings
Captain o-ring is way overpriced.
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Mcmaster-Carr is also your friend. NEVER pay gun companies price for o-rings if you have measurements. You can always find them cheaper.
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There's also Oringsandmore and the o-ring store. ALL of the places I mentioned get you more o-rings for less money than buying from the gun manufacturers.
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Yup, @Gerry52 definitely helped me prepare for a recent order. I jeot coming across the advice to use calipers to measure an o-ring advice which is fine if you have the o-ring off or on hand. Since shipping costs so much I figured it was worth it to go over the parts lists of several rifles and make a list of o-rings to order just to have them on hand in the event that I need to repair a leak or rebuild a regulator. Compiling that list turned out to be a big PITA since I was reading all sorts of funky written o-ring measurements. I felt like some companies try to make it more difficult to identify parts so the user is compelled to contact them and buy directly from them. Then some want to charge 5-10x the actual price of the o-ring, then there’s crazy shipping cost that could be avoided by placing a few o-rings in an envelope with a stamp. It took me a couple days to sort things out for my order. But I got a pretty good amount for $85 shipped from The O-ring Store. My order took about a week to arrive. I didn’t count them, but I literally bought hundreds of o-rings, maybe 1000. I’m not sure. Hopefully I have my bases covered. There were some that I wasn’t able to locate.
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