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Scubapro O-ring Sizes

Discussion in 'Repairing your own Gear' started by awap, Feb 7, 2010.

  1. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    Nice work Doc,

    Much more accurate than my pictures below. SP does indeed use EPDM for that application. I've attached a helpful chart showing the standard sizes and materials. The thanks goes out to Zung for all the hard work on this table. Additionally, for my own regulators, I have had success with Viton o-rings from McMaster McMaster-Carr
    The i.d. for these o-rings is 2.0 mm not 2.2mm (less than 0.008 in) and remember, the true i.d. of an o-ring is determined after it's installed. The FKM (Viton) seal in the link above is very reasonably priced at about $2.50 for a pack of 25.

    258783-3e7558760776264e5e2cce28870b568e.jpg

    258781-4f272b3f90bf7c4252e42a47d262ad5b.jpg

    258782-5e4b515359c694f45364da18e0b16acf.jpg
     

    Attached Files:

    Last edited: Aug 10, 2017
    axxel57 and rsingler like this.
  2. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    5,885
    7,634
    Fantastic, couv! Very nice work on that table.
    Yes, I use McMaster-Carr for 90% of my o-rings. Did I miss that one? Do you have a PN for the equivalent to that Precision 2.2 x 1 mm that I photo'ed?
    Is there an EPDM one?
     
  3. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    The thanks goes out to an A$$hole With A Penison & Zung for all the hard work on this table.
    The SP part number is the same as you have: 01-050-360
    The McMaster link above should take you to their part number 9263K283 for a Viton 2.0x1.0mm o-ring.
    Here is a link to a EPDM 2.0 i.d. X 1.0mm c.s. (McMaster number 1289n301) $4.40 for a pack of 50
    McMaster-Carr

    Sorry no exact match, but again you are looking at less than 8 thousands of an inch difference. (0.008 in.)

    Edit: the Parker number for a 2.2mm i.d. X 1.0mm o-ring is 5-101
     
    Last edited: Aug 10, 2017
    rsingler likes this.
  4. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    5,885
    7,634
    Well, I'm a little OCD over that lightweight poppet.
    I'll stick with 2.2mm, (and the separate shipping charge, lol).
    Thanks for checking, couv!
     
  5. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    I guess I'll have to send the good doctor a few so he can compare under his microscope.
     
    uncfnp likes this.
  6. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    5,885
    7,634
    Then you'll know why you always have those LITTLE TEENY bubbles coming out of your mouthpiece. :yeahbaby::rofl3:

    You don't have to measure them, couv. The bubbles are 0.1mm diameter.
     
    Wayward Son and couv like this.
  7. Fibonacci

    Fibonacci Contributor

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    673
    710
    Thanks for some really useful info... are there any guides for other SP seals?
    I did a quick search but nothing I can see for BC seals...

    I'm restoring an older Scubapro BC in good condition (pre welded connector) which has a threaded collar at the hose elbow sealed with an o-ring. The o-ring has taken a set and there is a small but annoying leak from the elbow so I'd like to replace it.
    The recess in the BC elbow is 29.25mm dia x 3.90mm deep, the inner collar that the inside of the o-ring seals against is 23.2mm dia.
    The old o-ring (with a set) measures OD 29.90mm x ID 23.20mm x 3.65mm
    Just wondering if Scubapro used Imperial or Metric o-rings, or if there is a service kit available?
    I'm thinking an ID 22mm x 3.5mm will fit allowing for a bit of compression when seating into the recess...?
     
    Last edited: Aug 13, 2017
  8. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    What is the model of BC? I can try digging around in my files to see if I can locate that p/n and seal information. In the meantime, this is where a trip to the hardware store to buy cheap seals just to find the correct size is often helpful. I'm guessing the seal you need is a -212 but I would buy a few seals larger and smaller just in case. Once you've determined the correct size-then order the more expensive seal so in 10-15 years from now the cheap ones fail you'll have it. :)
     
  9. Fibonacci

    Fibonacci Contributor

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    673
    710
     
    Last edited: Aug 13, 2017
  10. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    Fibonacci,

    Yes, SP has been known to use both imperial and metric, and you head correctly about the band clamp hardware.

    I cannot be sure if these are the same size, but if you're still having issues with your BC after replacing the seals, consider replacing the elbow assembly with parts found here.
    BCD Parts and Components | Dive Gear Express®
     

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