On Monday, August 27, 2007, at 07:50PM, "SandyF." <sbf70@xxxxxxxx> wrote: >According to the Unified Standards, the following applies to UN Coarse Series >Threads > >Size Basic Threads/inch Basic > Major Pitch > Dia. (in) Dia. (in) >1/4-20 0.2500 20 0.2175 >3/8-16 0.3750 16 0.3344 >The above information straight from my Machinery's Handbook, 21st ed. >S. B. Friedman, aka >SandyF ----- Ö¿Ö¬ >_________________________________________________________________ > >Date: Mon, 27 Aug 2007 16:12:55 -0700 (PDT) >From: John Jensen <jwjensen356@xxxxxxxxxxxxx> >Subject: [rollei_list] Re: ?? True Sizes of Tripod Mounting Holes > Dear All, My cousin back in Ireland has an old plate camera, which has two tripod holes, neither of which seem to fit a modern tripod screw. Were there any other common standards, or was it just a matter of makers choice? From what I remember the camera in question was British, and close to a 5x4 in size. All speculation or hypothesizing would be most welcome, though solid historical facts would of even greater value. All the best Larry Cuffe >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 measurement 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! >> >> --- >> Rollei List >> >> - Post to rollei_list@xxxxxxxxxxxxx >> >> - Subscribe at rollei_list-request@xxxxxxxxxxxxx >> with 'subscribe' >> in the subject field OR by logging into >> www.freelists.org >> >> - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx >> with >> 'unsubscribe' in the subject field OR by logging >> into www.freelists.org >> >> - Online, searchable archives are available at >> //www.freelists.org/archives/rollei_list >> >> > >--- >Rollei List > >- Post to rollei_list@xxxxxxxxxxxxx > >- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' >in the subject field OR by logging into www.freelists.org > >- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with >'unsubscribe' in the subject field OR by logging into www.freelists.org > >- Online, searchable archives are available at >//www.freelists.org/archives/rollei_list > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list