[rollei_list] Re: ?? True Sizes of Tripod Mounting Holes

Marc, I don't see that there is an equivalence to the
Unified thread and to a standard metric thread.  For
the 3/8-16 thread the pitch distance is 0.0625".  This
is equal to 1.5875 mm.  The 3/8" (0.375") thread size
is slightly smaller than an M10 which has a thread
size of 0.3937" and a pitch of 1.5 mm.

If there were a hypothetical M9.5 thread (0.374") with
a 1.5 mm pitch, it would come quite close to matching
the 3/8-16 thread size.  But I don't see that there is
such an animal.

John

--- Marc James Small <marcsmall@xxxxxxxxxxx> wrote:

> I would like to know the true specifications of 
> the two common tripod threads.  I believe that 
> the larger thread has a Metric measuremetn which 
> works with an SAE thread.  I would appreciate 
> your help in providing the SAE and Metric 
> measurements for both the smaller and the larger 
> mounts.  Extra points to those who can identify 
> the actual pitch of the thread (DIN, SAE, or
> Whitworth, or whatever).
> 
> Enquiring Camera Lore Fanatics Want to Know!
> 
> Marc
> 
> 
> 
> msmall@xxxxxxxxxxxx
> Cha robh bàs fir gun ghràs fir!
> 
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