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Diverspoint
Contributor
I sent you a PM
Hey friends. Thank you so much for putting this together. I have made some changes to the Excel sheets and added in the Mcmaster carr links to make it simpler and easier to order. I have also set them up as a filter. If you click the carrot above your regulator and uncheck the Blank box you only have the o-rings you need. I also found the 2.2mm x1mm o-rings on Amazon and the 109s. I didn't put much thought into the Buna vs Nitrile vs Pu but you can easily change the material. I hope this helps.
amazoncom/gp/product/B07W4WV239/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
amazoncom/dp/B000FMYR9S?psc=1&ref=ppx_yo2ov_dt_b_product_details
add a period before com
As always let me know if you need anything else of if there are any mistakes.
Happy Bubble Making!!!!
amazoncom/gp/product/B07W4WV239/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
amazoncom/dp/B000FMYR9S?psc=1&ref=ppx_yo2ov_dt_b_product_details
add a period before com
As always let me know if you need anything else of if there are any mistakes.
Happy Bubble Making!!!!
Scubagaskets
Contributor
In respect of scuba orings for scubapro we offer the following list O-Rings - Scuba Gaskets
I was looking at the MK19 evo schematic. There are two orings that I could not find the size herein and so I have had a guess based on paper chart measurements. I don't have the MK19evo kit instead I have the MK17evo kit, and it just so happens these are the two I want to source to complete the kit. The missing orings I believe are:
01-050-165 2-020 EP70
01-050-183 2-025 N70
The only other difference in the kits is as far as I can tell is the sleeve part #39 , whilst the hp valve and cap are the same. This sleeve is different because the balance chamber is different.
I have enrolled in Rob's course so this is prep for that.
01-050-165 2-020 EP70
01-050-183 2-025 N70
The only other difference in the kits is as far as I can tell is the sleeve part #39 , whilst the hp valve and cap are the same. This sleeve is different because the balance chamber is different.
I have enrolled in Rob's course so this is prep for that.
There are very few definitive Scubapro o-ring size references.
Three definitive references are attached below, but are missing many modern sizes, and include old PU o-rings that have since been abandoned by Scubapro.
There is lots of misinformation out there handed down repeatedly.
With respect, one example is in the spreadsheet quoted above by @Iron_DPT. The -363 2nd stage poppet o-ring has been argued for years here on ScubaBoard. The actual size is 1 x 2.2mm, which is a custom size run, and is not in most metric inventories. We've proved it by microscopic exam, yet folks continue to use a 1 x 2.5 "since it works", but with little thought to the added friction of a larger o-ring inside the balance chamber for this critical component.
The Mk19EVO has a few new ones:
01-050-317 (not really new), which measures at 1.88 x 2.59 mm is a Parker 5-578. Inventory of this o-ring at EP80 or 90 (assuming that's the material) out in the industry is zero. You'd have to do a special run, or get the o-ring from Scubapro. This is the critical HP seal inside the balance chamber, and I'm sure someone's going to try to substitute a 2-005, with uncertain results. I'm going to try to get a quote from AceSeal, since it's local for me, as well as PAI, since they did my custom run of 1x2.2's. But this would be a perfect example of where DIY goes astray.
01-050-165 indeed measures out with a CS of 1.78mm, which makes it an AS568 or BS1806 standard o-ring. Comparing it from a kit with my stock confirms that it's a 2-020. EPDM 70 would be a good guess on material.
01-050-183 also has a CS of 1.78mm, and matches a 2-025 in my shop. I'm interested in where a nitrile specification came from? That's a good choice, IMO, but Scubapro has few nitrile o-rings specified these days.
Scubapro and Aqualung continue to have odd spec's, and whether it's because it was readily available (in Italy, in Scubapro's case), or whether it's to discourage self-service, you need to tread with care.
A digital caliper to measure cross-section is your best friend! It will quickly tell you what standard you're working with.
OD/ID can be a little harder with larger o-rings, but a USB microscope helps at times.
Parker 5-series 0.97mm CS
Metric CS 1.0mm (among many)
AS568 CS 1.02mm (0.040")
3-901 CS 1.42mm
BS4518 CS 1.60mm
3-902,3 CS 1.63mm
AS568 2-series, BS 1806 CS 1.78mm (0.070")
NFT T47-501 and JIS B2401 CS 1.80mm
3-904,5 CS 1.83mm
Parker 5-series 1.88mm CS
JIS B2401 CS 1.90mm
3-906 1,98mm CS
Metric 2.0mm CS (among many)
3-907 2.08mm CS
3-908 2.21mm CS
BS 4518 2.40mm CS
3-909,10 2.46mm CS
Parker 5-series 2.54mm CS
AS568 1-series 2.62mm CS
ISO 3601 2.65mm CS
And on and on...
With static o-rings, you can get away with a lot of substitution. Witness the industry use of 2-010, 2-011 and 2-012 port plug o-rings, when SAE J1926-1 spec'ed the port design for a 3-903 and 3-904.
But with dynamic o-rings, you might be playing with fire...
Three definitive references are attached below, but are missing many modern sizes, and include old PU o-rings that have since been abandoned by Scubapro.
There is lots of misinformation out there handed down repeatedly.
With respect, one example is in the spreadsheet quoted above by @Iron_DPT. The -363 2nd stage poppet o-ring has been argued for years here on ScubaBoard. The actual size is 1 x 2.2mm, which is a custom size run, and is not in most metric inventories. We've proved it by microscopic exam, yet folks continue to use a 1 x 2.5 "since it works", but with little thought to the added friction of a larger o-ring inside the balance chamber for this critical component.
The Mk19EVO has a few new ones:
01-050-317 (not really new), which measures at 1.88 x 2.59 mm is a Parker 5-578. Inventory of this o-ring at EP80 or 90 (assuming that's the material) out in the industry is zero. You'd have to do a special run, or get the o-ring from Scubapro. This is the critical HP seal inside the balance chamber, and I'm sure someone's going to try to substitute a 2-005, with uncertain results. I'm going to try to get a quote from AceSeal, since it's local for me, as well as PAI, since they did my custom run of 1x2.2's. But this would be a perfect example of where DIY goes astray.
01-050-165 indeed measures out with a CS of 1.78mm, which makes it an AS568 or BS1806 standard o-ring. Comparing it from a kit with my stock confirms that it's a 2-020. EPDM 70 would be a good guess on material.
01-050-183 also has a CS of 1.78mm, and matches a 2-025 in my shop. I'm interested in where a nitrile specification came from? That's a good choice, IMO, but Scubapro has few nitrile o-rings specified these days.
Scubapro and Aqualung continue to have odd spec's, and whether it's because it was readily available (in Italy, in Scubapro's case), or whether it's to discourage self-service, you need to tread with care.
A digital caliper to measure cross-section is your best friend! It will quickly tell you what standard you're working with.
OD/ID can be a little harder with larger o-rings, but a USB microscope helps at times.
Parker 5-series 0.97mm CS
Metric CS 1.0mm (among many)
AS568 CS 1.02mm (0.040")
3-901 CS 1.42mm
BS4518 CS 1.60mm
3-902,3 CS 1.63mm
AS568 2-series, BS 1806 CS 1.78mm (0.070")
NFT T47-501 and JIS B2401 CS 1.80mm
3-904,5 CS 1.83mm
Parker 5-series 1.88mm CS
JIS B2401 CS 1.90mm
3-906 1,98mm CS
Metric 2.0mm CS (among many)
3-907 2.08mm CS
3-908 2.21mm CS
BS 4518 2.40mm CS
3-909,10 2.46mm CS
Parker 5-series 2.54mm CS
AS568 1-series 2.62mm CS
ISO 3601 2.65mm CS
And on and on...
With static o-rings, you can get away with a lot of substitution. Witness the industry use of 2-010, 2-011 and 2-012 port plug o-rings, when SAE J1926-1 spec'ed the port design for a 3-903 and 3-904.
But with dynamic o-rings, you might be playing with fire...
Attachments
Well, I'm impressed!
Precision Associates got back to me already regarding the 5-578.
Like many Parker 5-series o-rings, companies have let the tooling go. I don't know whom Scubapro uses for this almost proprietary o-ring.
However, PAI is tooled for a 0.075 +/-0.003" x 0.102 +/-0.003" o-ring.
In metric, that's 1.905mm x 2.59mm, and with a common o-ring tolerance of .07mm after molding, that's close enough for me.
No stock, of course, but since they're already tooled, they'll typically do it for a modest charge and an 8-week wait.
Interestingly, they're temporarily out of FKM duro 90 stock!! But they can do nitrile and EPDM.
I may just take them up on their offer if I can't source Scubapro -317's.
If it's like my quad ring experiment, it'll end up $1 per o-ring. Oh, well.
Precision Associates got back to me already regarding the 5-578.
Like many Parker 5-series o-rings, companies have let the tooling go. I don't know whom Scubapro uses for this almost proprietary o-ring.
However, PAI is tooled for a 0.075 +/-0.003" x 0.102 +/-0.003" o-ring.
In metric, that's 1.905mm x 2.59mm, and with a common o-ring tolerance of .07mm after molding, that's close enough for me.
No stock, of course, but since they're already tooled, they'll typically do it for a modest charge and an 8-week wait.
Interestingly, they're temporarily out of FKM duro 90 stock!! But they can do nitrile and EPDM.
I may just take them up on their offer if I can't source Scubapro -317's.
If it's like my quad ring experiment, it'll end up $1 per o-ring. Oh, well.
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