Seagull Threads (Nuts and Bolts)

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Nudge
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Location: Auckland, New Zealand

Re: Seagull Threads (Nuts and Bolts)

Post by Nudge » Sun Dec 10, 2017 9:57 am

Liam, you 100% correct!
It should be a 7/16 x 18 BSF.

I will make the change up the top.

Thanks for pointing it out.
"THE KING OF BLING"!
Is it better to over think, than not think at all?

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Nudge
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Location: Auckland, New Zealand

Re: Seagull Threads (Nuts and Bolts)

Post by Nudge » Sun Oct 27, 2019 1:41 am

Took my boat and Silver Seagull out for a run today (first day off in 6 months) only to find it was not pumping water very well. Pulled the water intake pipe off to find the brass fitting that goes into the block half blocked with hard rust. The hole was still big enough for air and water from a hose but not full flow.

with the the fitting out it was a good time to measure the thread
The square end that fits into the block looks like 1/4 18 NPS (60deg)
The water pipe end is not the same! I think it is 1/4 19 BSPF (55deg)

Can someone check these threads please
"THE KING OF BLING"!
Is it better to over think, than not think at all?

Raya
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Location: Hope Island

Re: Seagull Threads (Nuts and Bolts)

Post by Raya » Wed Feb 19, 2020 11:30 pm

I was chasing the backing nut for the pipe fitting in the exhaust pipe. My local nuts and bolt store measured the fitting thread as 1/4" BSPF and sent me across the road to a hydraulic hose as they didn't stock the fitting. The back nut I purchased fitted both threads on the fitting. (The F on the end of BSPF designates FUEL which means that it is a parallel thread.) I measured the thread on the end that fits in the block as 18TPI, the same as Nudge, but the back nut fitted easily. Maybe because the nut is so thin, it screwed on regardless of the difference, or the thread is really 19TPI. I don't have a 19TPI gauge to measure it.
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