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SP G250 jam nut

Discussion in 'Do It Yourself - DIY' started by couv, Apr 4, 2018.

  1. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    5,954
    3,772
    In a thread (First Reg Set) too far removed in title from the intent of this thread, some of the Usual Suspects were discussing an alternative to the proprietary jam nut found on the G250 and similar second stages. I suggested that a standard 316 stainless steel nut with the same thread pitch (9/16-18) might work. However, I purchased one from the Helpful Hardware Man and I'm sorry to report that while the threads are correct and the nut threads onto the airbarrel--- ALMOST. The problem is with the exhaust tee on the second stage body. The nut is too large to fit under the tee for the final few turns. Too bad because McMaster has them for about a buck each.

    Unless one of you sharpies can come up with an alternative, I'll be sticking with my SP jam nut.

    G250 jam nut.JPG
     
    Last edited: Apr 4, 2018
    buddhasummer likes this.
  2. rhwestfall

    rhwestfall Woof! ScubaBoard Sponsor

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    16,597
    19,733
    Washer or two
     
    couv likes this.
  3. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    5,954
    3,772
    Yes, that would work, and using a thinner nut (also available at McMaster) would allow threading the hose on the normal distance. However, a nut & washers just doesn't "seem" right.
     
  4. ams511

    ams511 Solo Diver

    # of Dives: I just don't log dives
    Location: Miami, Florida
    7,200
    2,005
    Thanks for the effort.
     
  5. lexvil

    lexvil ScubaBoard Sponsor ScubaBoard Sponsor

    # of Dives: 1,000 - 2,499
    Location: jamestown, ca.
    4,245
    4,107
    Notch the tee, because that makes more sense than buying the tool:stirpot:
     
    buddhasummer and couv like this.
  6. Fibonacci

    Fibonacci Contributor

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    664
    701
    Machine off half or two thirds of the hex into a cylindrical section to let it pass under the T?
     
    JamesBon92007, northernone and couv like this.
  7. ams511

    ams511 Solo Diver

    # of Dives: I just don't log dives
    Location: Miami, Florida
    7,200
    2,005
  8. ams511

    ams511 Solo Diver

    # of Dives: I just don't log dives
    Location: Miami, Florida
    7,200
    2,005
  9. Bryan@Vintage Double Hose

    Bryan@Vintage Double Hose Instructor, Scuba

    679
    874
    Didn't we just talk about this ?
     
    northernone likes this.
  10. ams511

    ams511 Solo Diver

    # of Dives: I just don't log dives
    Location: Miami, Florida
    7,200
    2,005
    Yes, we are getting estimates so we can talk you down in price. :nyah:
     
    buddhasummer likes this.

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