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what is the thread size of the rear lap belts
The rear lap belts in the body work you know the seats you can't sit in
 have a thread and I want to know what the size of that is and is it a speical thread like Metric Fine etc etc????? 18 hrs to Le Mans Classic and the clock is ticking...and my harness is not in....ekk!!
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07-05-2006, 03:52 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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Pretty sure seat belts are not metric, they are almost all inch, fine thread, bastard size. Maybe so we won't put a cheap bolt in it's place?
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-05-2006, 04:29 AM
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Irrationally exuberant
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7/16-20
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07-05-2006, 05:53 AM
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Slumlord
Join Date: May 2001
Location: Canada
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That's it.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-05-2006, 06:39 AM
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Quote:
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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07-05-2006, 09:38 AM
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Location: Galivants Ferry, SC
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John....
I don't think so...I've posted on this topic many times before... Many people believe they're 11 mm until they turn past 4 complete turns and get terrible cross-thread. I guess you *could* force it , though... Common convention for all the world's cars is 7/16-20 UNF fine pitch for seat belts... Dunno...maybe it was different in '69 but I really don't think so.... - Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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07-05-2006, 09:54 AM
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Slumlord
Join Date: May 2001
Location: Canada
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7/16 = 0.4375" | 11mm = .4331"
20 tpi = .050" per thread | 1.25 mm pitch = 0.0492 in Easy to think they are the same...but I'm pretty sure Chris is correct.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-05-2006, 10:22 AM
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Cheers Guys it's 7/16th UNF I went out and they only had 3 and I needed 3 !!! my lucky day
The cars are metric but the seat belts were still imperial for some time until they changed over to metric.. ( Seat Belt suppliers ) OK now ALL I need to do is get a drill and drill some holes and add my harness to the car and that's another job off my list.. I went down to the Ferry with the first batch of guys I will join them tomorrow... It's all go....... France here we come....... 
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07-05-2006, 02:12 PM
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That's a very cool convoy, some great colors there. Where to?
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07-05-2006, 02:42 PM
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OK. By chance I needed to install one of these bolts and you're right -- it's a 7/16-20.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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07-05-2006, 03:44 PM
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Quote:
.... I don't believe any cars' seat belts are metric..not even today...although I may be convinced with compelling counter-argument. - Wil |
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07-05-2006, 06:39 PM
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Wil,
My car seat belt bolts have UNF threads but metric heads that accept a 17 mm wrench. This may be part of the confusion.
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Harry 1970 VW Sunroof Bus - "The Magic Bus" 1971 Jaguar XKE 2+2 V12 Coupe - {insert name here} 1973.5 911T Targa - "Smokey" 2020 MB E350 4Matic |
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07-05-2006, 07:26 PM
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Possible that the 7/16"-20 pitch bolt uses an 11/16" head ( 0.6875").....compares well with 17mm ( = 0.6693")
- Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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08-24-2006, 06:22 AM
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1969 Porsche 912 1600 
The Blue Pheonix
1969 Porsche 911E 2.0 E
1972 Porsche 911T 2.4 MFi
