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Old 07 February 2011, 11:45   #1
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Standard aerial mount threads

Does anyone know the technical description of the standard aerial mounts that vhf and gps aerials screw on to. All I can find is it being referred to as 1" 14 TPI.

I'm trying to find a short plastic extension piece (say 2") but have drawn a blank via the normal marine suppliers. It is very similar to 3/4" BSP, the pitch is near as dammit the same, but the BSP diameter is slightly larger. I was hoping to use some plastic pipe connectors cobbled together to create an extension, but so far my cunning plan has failed me
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Old 07 February 2011, 11:51   #2
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1" x 14 tpi is the standard nomenclature. Exactly what spec are you looking for?


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Old 07 February 2011, 11:58   #3
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You will be wanting a small extension pole, the smallest is probably not that small though - 5" or so for 12.
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Old 07 February 2011, 12:56   #4
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I always assumed the 1"x14 tpi they use for antennas etc was a standard bsp thread but I just looked in my Zeus tables and 1" bsp is actually 11tpi.
1" UNF is 12tpi.

Edit: According to wiki 1"x14tpi is the "current" UNF, I guess they decided to change it at some point

Good luck trying to find a piece of pipe with a UNF thread
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Old 07 February 2011, 13:26   #5
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Quote:
Originally Posted by Channel Ribs View Post
You will be wanting a small extension pole, the smallest is probably not that small though - 5" or so for 12.
Yeah, exactly. I've picked up a 6" stainless one, but really it's a bit too long and my mount is aluminium which will make a nice battery in seawater
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Old 07 February 2011, 13:34   #6
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If you can't find any other solution I can shorten it for you. I've got some tef-gel here too, a good bit on the threads should keep the galvanic corrosion under control
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