C30 Stuffing box nut size?

[SJI Sailor]

I need to purchase some extra nuts to go on the stuffing box / packing gland bolts in our 2019 C30. Can anyone tell me the size or a part number?

Why? In our continuing stuffing box saga, we had it repacked with graphite coils. They seemed fine but after our second post-work excursion I discovered only one nut remaining on each post. I will look later today for the second/lock nuts in the bilge but would also like to get some backups. I could take one loose and use it to match (but hesitate unless I find the others because then there would be no nut at all on one of the packing gland posts!)

 

[SJI Sailor]

And the answer -- at least on our boat -- is 3/8" - 16 thread. Took one to West Marine and matched it, so now we have extras.

 

[asm777]

FYI, there are two different type nuts (Full nut and Jam nut) according to my e-mail records when I had to source replacements last year. Posted in this previous thread: viewtopic.php?f=2&t=5372&start=15

#7 Part Number 0250S375-16 Hex Full nut SS 3/8”-16

#8 Part Number 0252S375-16 Hex Jam nut SS 3/8”-16

Don't overtighten like I did or you could strip the threads on the brass studs and need to replace them too!

 

[SJI Sailor]

Thank you, very good to know! Are those p/n's to order from RT? If so, I will get some and hope my temporary fix is OK on the threads.

FWIW the graphite is working well so far. Hoping we avoid another round of problems -- inability to adjust properly (which I still suspect was from dealer or maybe factory overtightening when new).

 

[asm777]

I just checked my old e-mails and RT/CW referred me to Ron @ www.marinehardware.com for the parts. Hope that helps!