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68 Beetle Seatbelt Bolt Documentation
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PierreDeKat
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PostPosted: Tue Jan 31, 2006 2:25 pm    Post subject: 68 Beetle Seatbelt Bolt Documentation Reply with quote

I just wanted to document the seatbelt bolts in my 68 Beetle for the benefit of anybody searching the archives in the same situation I was in: trying to purchase bolts to fit the existing threaded seatbelt studs.

For reasons unknown to me, these bolts are not metric; they're threaded SAE 7/16-20 -- that's a fine thread 7/16 inch bolt. All of the threaded seatbelt inserts are threaded this way: four behind the backseat, two on each door column, and two holding the seatbelt levers between the front seats.

VW may have used this fastener because of some sort of deal with Repa, the manufacturer of the OEM seatbelts during this time. Who knows; they just did it that way, in 1968 Beetles, and I'm sure several other models and years of Volkswagens around that same time period.

Here is a picture of an original door column bolt, alongside an original nylon washer that allows the seatbelt cleats some freedom to automatically adjust for the least slack.

Image may have been reduced in size. Click image to view fullscreen.


You probably won't be able to find a shoulder bolt like this one at your local hardware store, but they usually carry a 7/16-20x1 inch bolt that's fully threaded, and you might get lucky and find a little 7/16 ID cylindrical piece to act as the shoulder part of the bolt.

Keywords: Repa seat belt lap belts seatbelt seatbelts bolt thread threaded threading size non-metric SAE screw fastener nut weldnut anchor shoulderbolt 2-point 3-point retractable harness
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randydog
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PostPosted: Sat Dec 16, 2017 9:34 am    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

thank you for noticing the lack of interest in original bolts very helpful I also know porsche used them also
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pwmcguire
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PostPosted: Sat Dec 16, 2017 10:55 am    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

There was an agreement long ago from the manufactures to use this bolt I think it crosses over to metric.
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Cusser
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PostPosted: Sat Dec 16, 2017 12:15 pm    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

pwmcguire wrote:
There was an agreement long ago from the manufactures to use this bolt I think it crosses over to metric.


I used USF 7/16-20 when I installed retractable belts in my 1971; Internet search shows this to be the agreement size, like agreement on 14mm and 18mm spark plug threads, and 13, 14, 15 inch wheels even on our old beetles.

Some have claimed that an 11mm metric thread will fit; good luck finding those, you'll be older than our VWs by the time you try those.

Recommend USF 7/16-20, get from a seat belt company or elsewhere if you need ones with shoulders.
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PostPosted: Sun Dec 17, 2017 1:30 am    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

Cusser wrote:

Some have claimed that an 11mm metric thread will fit; good luck finding those, you'll be older than our VWs by the time you try those.


11 mm x 1.25 thread.

It's easier just to go to the wreckers and pull seat belt bolts from any Japanese car, if you can't locate used VW.
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Multi69s
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PostPosted: Sun Dec 17, 2017 2:55 am    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

neil68 wrote:

11 mm x 1.25 thread. - It's easier just to go to the wreckers and pull seat belt bolts from any Japanese car, if you can't locate used VW.


X1, X2, X3

Yes you can get a 7/16" bolt to work, but it ISN'T THE RIGHT BOLT. Take a look at the very bottom of this thread, and I mathematically walk you through the difference.

https://www.thesamba.com/vw/forum/viewtopic.php?t=554235&highlight=

VW NEVER used an SAE thread anywhere on our cars.
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scrivyscriv
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PostPosted: Sun Dec 17, 2017 2:56 am    Post subject: Re: 68 Beetle Seatbelt Bolt Documentation Reply with quote

neil68 wrote:
It's easier just to go to the wreckers and pull seat belt bolts from any Japanese car, if you can't locate used VW.


Absolutely agree! I bought the eBay Hummer seat belts and wasn't 100% satisfied with the fitment of the included bolts. I looked at every import car in the junkyard (with no impact damage, think about that) and took multiple seat belt bolts with several different lengths and shoulder dimensions. Y'all are right, a regular hardware store doesn't have the bolts we need to mount the seat belts up!
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