[Roadsters] seat belts

[James L Culp]

For clarification..

3/8-16 is UNC - UNC means unified coarse which is a special case of UN
3/8-20 is UN - UN means unified or the standard
3/8-24 is UNF - UNF means unified fine which is also a special case of 
UN

Interestingly, I've found through the years that most bolts usually fit 
in the category of coarse or fine and not the standard!

I have a '66 1600...  I ran a 3/8-20 clearance tap in my seat belt 
threaded inserts and found it to be the correct size.  An M8(metric) any 
thread pitch falls in the hole and a M10 is just too large.

James




On Sat, Dec 17, 2011 at 2:19 AM, Fred Schroeder wrote:

> NC is 3/8-16
> NF is 3/8-24
>
> I'm not familiar with 3/8-20.  Metric bolts perhaps?
>
> Best regards,
>
> Fred Schroeder
> roadster2 at schroeder-family.us
> Home page: http://schroeder-family.us
> NRA Life Member
>
> Behold the superfluous. They are always sick. They
> vomit their gall and call it a newspaper.
> Friedrich Wilhelm Nietzsche   1844-1900
>   ----- Original Message -----
>   From: Gary and Cindy Ault
>   To: datsun-roadsters at autox.team.net ; vulforge at aol.com
>   Sent: Friday, December 16, 2011 9:19 PM
>   Subject: Re: [Roadsters] seat belts
>
>
>   Russell,
>
>   Those threaded inserts are/were intended for seat belts.  My '66 
> 1600 came
>   with factory seat belts installed in those locations.  If I 
> understand the
>   laws correctly, seat belt were not required in imported cars until 
> 1968.
>   But, I suspect Nissan installed belts in all their cars headed for 
> the US,
>   and I wouldn't be surprised if Gary's car originally had belts.
>
>   I wouldn't be surprised to find there are threaded inserts for the 
> shoulder
>   harness installed beginning with '67-1/2 on some of the earlier cars 
> --
>   under the vinyl.
>
>   The bolts are 3/8-20.  (I just measured the bolts on a set of 
> replacement
>   belts I bought for my '67-1/2.)  I think that's National Fine.  (I 
> know that
>   5/16-18 is NC and 5/16-24 is NF, so 3/8-20 seems to make sense as 
> NF.)
>
>   Gary
>
>   ----- Original Message -----
>   From: <vulforge at aol.com>
>   To: <datsun-roadsters at autox.team.net>
>   Sent: Friday, December 16, 2011 4:25 PM
>   Subject: [Roadsters] seat belts
>
>
>> I recently put belts in my early '67.  There are already threaded 
>> inserts
>> behind and beside the seats.  One pair is on the trans tunnel about 
>> 2" up
>> from
>> the floor right behind the seats.  The other is on the angled part of 
>> the
>> floor that sloes down from the package shelf to the floor toward the
>> outside
>> of the car.  I think theses bolt points may have been intended for 
>> the
>> roll
>> bar, but they work fine for seat belts.  I don't remember the thread
> size,
>> might be 3/8 fine?
>>
>>
>> Russell Criswell
>> Vulcan's Forge
>> 3936 Broadway
>> Kansas City, MO
>> 64111
>>
>> 816-931-6303
>> 816-931-9378 fax
>> 877-531-1046 toll-free
>> www.vulcans-forge.com
>> ________________________________________
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