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@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@autox.team.net ; vulforge@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@aol.com>
> To: <datsun-roadsters@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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>>
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