S4 Seat clamp bolt size?

PostPost by: Grizzly » Sat Jun 24, 2017 3:29 pm

Hi all,

Just having a bit of a issue with the S4 seat clamp bobbin's in the floor.

I have been through my bolt draws and the only bolt that seems to start in the thread is a Metric?? (which can't be right) i can only assume with the seats being out for the last 30 years the threads have corroded or full of crud and could do with a tap running through.... So the problem is i can't seem to find the thread size/type anywhere.

Looking down the bobbin with a torch i'd guess it's 3/8 unc but when i try a bolt it isn't having it. I also assume the Bobbin is threaded and isn't just a plain with a Nut under the floor? and what looks like threads are witness marks??

So i thought i'd ask before making a complete balls up of it or breaking a tap off in a bobbin (which wouldn't be ideal).
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PostPost by: prezoom » Sat Jun 24, 2017 4:04 pm

Can't speak for a non-Federal model, but during that time period all seatbelt retaining bolts were 7/16-20 here in the US. This included all imports. My August 1972 Plus2 130S are the same.
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PostPost by: Grizzly » Sat Jun 24, 2017 4:16 pm

Sorry no not seat belts, i'm after the Seat clamp-bobbin bolt size, the clamp that fixes the seat to the floor.

http://www.kelsport.net/parts/product_d ... ctionID=62
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PostPost by: Gray » Sat Jun 24, 2017 4:54 pm

It should be UNC
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PostPost by: 1owner69Elan » Sat Jun 24, 2017 10:36 pm

Just happened to have my S4 (Federal) seats out.

The bolt for the front clamps that goes into the bobbin is 3/8 x 1.25 long UNC.
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PostPost by: MarkDa » Sat Jun 24, 2017 11:34 pm

Second that. I've just cleaned my bilts up with a die ans they ran right up by hand with a little copper slip.
You'd be unlucky to snap a tap in a bobbin aa they are far too soft.
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PostPost by: Grizzly » Sun Jun 25, 2017 9:46 am

Thanks for that :D
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