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Exciting.
SP G250 jam nut
- Thread starter Couv
- Start date
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1967Goat
Contributor
Put me down for 8. I've been picking up G250's on Craigslist over the past year or so.
Once I receive the Halcyon Jam Nut sample, I’ll have one made and tested comparing to the sample.
- Messages
- 17,537
- Reaction score
- 9,782
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
I think the same design would be great. A normal "nut" wouldn't be in full contact with case.
I'm wondering if a ss washer does the trick? Yeah, Simon's OCD can't handle that... A proper shaped one would be favorable. Watching this...
- Messages
- 17,537
- Reaction score
- 9,782
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
Bob, noooooooooo
- Messages
- 17,537
- Reaction score
- 9,782
- Location
- Somewhere between here and there
- # of dives
- 2500 - 4999
I'll post side by side photo tomorrow with specs.
Geo7
Contributor
Yup, that's the one I'll be sending your way tomorrow...
1967Goat
Contributor
The nut in the picture from open water diver is the Halcyon nut. That nut will not work on a G250. The flared shoulder is too big. In my possession I have 4 G250V's, 3 G250's and 6 of the Halcyon nuts for the G250V's.
The OD of the flared shoulder on the Halcyon nut is .895"
The wrench flats on the Halcyon nuts is .667".
The Halcyon nut is .500" thick.
The points on the wrench flats are .743" (widest points).
The OD of the splined nut for the G250 is .743" and is .75" thick.
A typical nut with the 9/16 thread is .870 on the wrench flats, .992 at the points.
The Halcyon nuts will not screw down on to the G250 because the .895 flare is took large, it hits the exhaust tee.
If you flip the nut over, the nut will clear and tighten down correctly.
IMO, the nut needs to have wrench flats of .667", points of .743" and be .375" thick.
I am not sure why the base of the nut needs to be round (flare) and not a typical hex shape.
The OD of the flared shoulder on the Halcyon nut is .895"
The wrench flats on the Halcyon nuts is .667".
The Halcyon nut is .500" thick.
The points on the wrench flats are .743" (widest points).
The OD of the splined nut for the G250 is .743" and is .75" thick.
A typical nut with the 9/16 thread is .870 on the wrench flats, .992 at the points.
The Halcyon nuts will not screw down on to the G250 because the .895 flare is took large, it hits the exhaust tee.
If you flip the nut over, the nut will clear and tighten down correctly.
IMO, the nut needs to have wrench flats of .667", points of .743" and be .375" thick.
I am not sure why the base of the nut needs to be round (flare) and not a typical hex shape.
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