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Apeks O-rings vs. McMaster

Discussion in 'Repairing your own Gear' started by keysdvr, Oct 21, 2020.

  1. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    5,885
    7,634
    Working on converting this to Word and PDF now.
    But @buddhasummer , the listed ID's don't quite match the BS1806 size that's attributed.

    For example, the first item AP1154 is a 1.78x6mm.
    A BS1806 010 is 1.78x6.07mm

    So my question is, which is correct?
    Is the Apeks oring 6mm ID and a BS010 is the closest match? Or is the listed ID rounded off?
    The reason I ask is that the width is the precise cross section of a BS1806 oring.

    Did Apeks really spec those ID's?
    It probably doesn't matter, but it would be nice to know.
     
    buddhasummer likes this.
  2. buddhasummer

    buddhasummer Bat sh.t crazy

    # of Dives: 1,000 - 2,499
    Location: Nanny State
    12,195
    4,670
    I tried but seems it's beyond my IT skill level. Happy to email it you you to see if you can do so.
     
    couv likes this.
  3. couv

    couv Instructor, Scuba

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

    buddhasummer Bat sh.t crazy

    # of Dives: 1,000 - 2,499
    Location: Nanny State
    12,195
    4,670
    Sent.
     
  5. buddhasummer

    buddhasummer Bat sh.t crazy

    # of Dives: 1,000 - 2,499
    Location: Nanny State
    12,195
    4,670
    Sent a different file too, we can compare them both. Cheers.
     
  6. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    received...thanks.
     
    buddhasummer likes this.
  7. buddhasummer

    buddhasummer Bat sh.t crazy

    # of Dives: 1,000 - 2,499
    Location: Nanny State
    12,195
    4,670
    I heave no idea, these are just files I picked up along the DIY way.

    The info is now in expert hands, I'll leave it to you guys.
     
  8. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,111
    3,975
    No expert, don't have any Apeks so I'll leave the proofreading to those more familiar.
     

    Attached Files:

    buddhasummer likes this.
  9. buddhasummer

    buddhasummer Bat sh.t crazy

    # of Dives: 1,000 - 2,499
    Location: Nanny State
    12,195
    4,670
    Thank you sir.
     
  10. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    5,885
    7,634
    Here's a crosswalk using Buddha's data, along with a Word file from another of our SB members from long ago.
    As you'll see, I can't find a spec for a BS607, but coincidentally, it matches an old Parker 5-series perfectly.
    McMaster has EPDM orings in most of the sizes, but the Shore is only 70.
    If you take Viton, you'll get Shore 75, which is closer.
    There's only one o-ring which is N/A via McMaster.
    I've coded the crosswalk green if the McMaster o-ring manufacturing tolerance covered the spec size on Buddha's list.
    It's in yellow if the manufacturing tolerance was slightly smaller or larger than the listed size.
    I frankly can't believe that Apeks would spec a standard cross-section like 1.78mm/0.070'', and then use an oddball ID.
    My guess is that the list ID's are rounded off. It was the very last o-ring (a BS607) that I can't find in any list, that made me think this way, since it perfectly matches a Parker 5-632.
     

    Attached Files:

    couv and buddhasummer like this.

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