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Old 01-26-2020, 11:37 AM   #1
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New Stuffing Box Nuts?

Hello! We need to replace the stuffing box nuts on Calypso, a 1977 Marine Trader; See attached photos. Does anyone know if there is a particular thread and type of nut? Thank you!
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Old 01-26-2020, 11:44 AM   #2
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Greetings,
Mr. C. My best guess would be a metric nut of no special alloy although SS would be best. You can probably take a nut to Fastenal, for example and get a match up. I would suggest double nuts on reassembly, locking one against the other.
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Old 01-26-2020, 11:51 AM   #3
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thanks! ...I tried the standard and it was not right. I'll try metric and let you know...
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Old 01-26-2020, 11:54 AM   #4
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Can you put a C-clamp on it and remove the nut and maybe the bolt. One side may hold it together at the dock while you get to a store right size also.
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Old 01-26-2020, 12:16 PM   #5
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Measure diameter with ruler, preferably a 6" stainless one.
Measure thread with a thread gauge. (Metric & SAE)
Both available at Amazon or any auto parts store.
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Old 01-26-2020, 12:20 PM   #6
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It could be the angle the camera was that but that bolt looks stressed, or bent. Better to replace both. If it is a stud and not a bolt, it should screw right out, if it is a bolt , a tap with a hammer should knock it loose.

I really would not worry about water intrusion, even if you remove both bolts at the same time, providing you don't forget to replace them and run the engine.

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Old 01-26-2020, 01:02 PM   #7
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New Stuffing Box Nuts?

Is a new shaft on the list also?
Silicon bronze on the nuts.
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Old 01-26-2020, 01:40 PM   #8
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Might be British Standard thread.

Mine was ordered from a guy in NY who imports MG car parts and only charged a few dollars shipping. Not at home so no contact info.

On mine an SAE would fit for about 3 turns then jamb.

All the long bolts and threaded rod on my Albin is this stuff as it was common over in Taiwan kn the 80s I have heard. Though I believe my rods are stainless.

If I had to redo ..I would just retap for SAE rod and nuts.
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Old 01-26-2020, 11:27 PM   #9
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Quote:
Originally Posted by Pete Meisinger View Post
It could be the angle the camera was that but that bolt looks stressed, or bent. Better to replace both. If it is a stud and not a bolt, it should screw right out, if it is a bolt , a tap with a hammer should knock it loose. pete
Looking at pic 1 the plate seems to have "a thread`s width" bend to it. Maybe it`s intended, maybe not.
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Old 01-27-2020, 12:11 AM   #10
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Personally I'd change the whole stuffing box for a PSS seal. Once fitted just a periodic check, no marking on the shaft/greasing/tightening. I've had one now for about 8 years with the boat in constant use and no problems. I fitted mine while the boat was in the water but you need to be a calm and competent DIY'er.
Just my 2 pence worth.
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Old 01-27-2020, 01:05 AM   #11
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1/2”-13 just a guess. Let me know if I’m close.
What’s wrong with the existing nuts?
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Old 01-30-2020, 12:13 AM   #12
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Should really be double nutted. As for thread, are there any original stuffing boxes left? The Fastenal suggestion is the best I've heard.
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Old 01-30-2020, 09:46 AM   #13
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On my boat the stuffing box (1983) is original. Why double nut? Those nuts have lots of back pressure and won't back off. Even if both loosened there would not be a catastrophic leak.
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Should really be double nutted. As for thread, are there any original stuffing boxes left? The Fastenal suggestion is the best I've heard.
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Old 01-30-2020, 10:50 AM   #14
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I recently replaced mine. They were BSW 1/2-12.
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Old 01-30-2020, 12:14 PM   #15
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Originally Posted by catalinajack View Post
On my boat the stuffing box (1983) is original. Why double nut? Those nuts have lots of back pressure and won't back off. Even if both loosened there would not be a catastrophic leak.
My stuffing box looks like that and it has double nuts on it.
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Old 01-30-2020, 01:10 PM   #16
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Originally Posted by 525cj View Post
I recently replaced mine. They were BSW 1/2-12.
Attachment 98882

That's where I got mine...as someone before me was nice enough to provide the info when I had trouble identifying the correct nut size.


We will see how this plays out...hope the OP posts what his solution was.


As far as double nutting...a good idea but probably overrated in this situation. The packing probably acts somewhat like a locknut by providing back pressure for awhile...and even then as posted....any loosening is not a catastrophic issue.
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Old 02-07-2020, 11:01 AM   #17
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Thank-you everyone -it is a 1/2-12 inch standard. I also need to add 2-3 layers of flax. Does anyone know the correct size? It's a 77 Marine Trader 40DC

Diver Dave: You say it should be silicon bronze nuts and not Stainless?
THANK YOU!
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Old 02-07-2020, 11:20 AM   #18
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New Stuffing Box Nuts?

I wonít say imperative. But the entire assy is a bronze alloy. Putting steel in the mix is not necessary for strength or availability. SiBr does not suffer from crevice corrosion or galvanic corrosion when near copper and seawater.
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Old 02-07-2020, 04:32 PM   #19
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Damn, my guess of 1/2 -13 was pretty close!
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Old 02-07-2020, 04:41 PM   #20
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Quote:
Originally Posted by Caribe View Post
Thank-you everyone -it is a 1/2-12 inch standard. I also need to add 2-3 layers of flax. Does anyone know the correct size? It's a 77 Marine Trader 40DC

Diver Dave: You say it should be silicon bronze nuts and not Stainless?
THANK YOU!
Sounds like the British Standard thread, copied by others.
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