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Thread: Specifications of International Thread Standards

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    Supporting Member DIYSwede's Avatar
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    DIYSwede's Tools

    Specifications of International Thread Standards

    When trying to repair older pieces of machinery, establishing their threads can be pretty confusing at times.

    In those cases (or just for kicks) perhaps the following personal page by Michael Prandl of Solingen, Germany can be of interest,
    listing quite a few, namely 73 of them... International Thread Standards.

    https://www.gewinde-normen.de/en/index.html

    Note: The site is only for personal use, no unauthorized copying allowed,
    it's NOT a searchable database
    , and Michael also explains why it isn't:

    Specifications of International Thread Standards-.5-inch-thread-search-result.jpg

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    Supporting Member NortonDommi's Avatar
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    Half the fun of old and/or oddball stuff is figuring out what the threads are, always easier if they are to a recognised international standard.
    Useful to be able to tell if they are one off's or special use as well.

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    Supporting Member mklotz's Avatar
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    mklotz's Tools
    Quote Originally Posted by DIYSwede View Post
    When trying to repair older pieces of machinery, establishing their threads can be pretty confusing at times.

    In those cases (or just for kicks) perhaps the following personal page by Michael Prandl of Solingen, Germany can be of interest,
    listing quite a few, namely 73 of them... International Thread Standards.

    https://www.gewinde-normen.de/en/index.html

    Note: The site is only for personal use, no unauthorized copying allowed,
    it's NOT a searchable database
    , and Michael also explains why it isn't:
    There is a program, FINDTHRD, on my page that has a searchable data base of some 400 threads. The contents of the associated text file provide more information...

    ----
    Andy Pugh, UK, has compiled a table of ~400 "standard" threads arranged in order of size (from 10 Whitworth instrument (0.010" dia.) up to 6" Gas) identified by type. A very handy tool for identifying 'mystery' threads one might encounter - especially when dealing with British equipment.

    The list is a bit tiresome to search by hand if one is trying to identify an unknown thread. I wrote a program to search it using either major diameter or pitch as the search argument.
    ----

    The list itself is in ASCII form and is part of the archive so, if you want only the list itself, you can obtain it. (However, it's a lot more useful when machine searchable via the program.)

    NB: All programs on my page are free but they were written back in the days of DOS so you will have to download and install a program like DOSBox to run them. That's not as bad as it sounds. There are a lot of excellent legacy DOS programs out there and being able to use them can be very handy.

    Here's an example of a typical output from the program. I asked it to search for all the threads that had pitches within 1% of 32 tpi. The meaning of the various thread name acronyms is given in the data file that accompanies the program.

    Code:
    A - Find thread from diameter in inches
    B - Find thread from diameter in millimeters
    C - Find thread from pitch in tpi (threads per inch)
    D - Find thread from pitch in millimeters
    M - Display this menu
    Q - Quit
    
    (A,B,C,D,M,Q) ? 
    Thread pitch [32 tpi] ? Allowable pitch error [1 %] ? 
    Name, diam (in), pitch (tpi), diam (mm), pitch (mm)
    
    123:  4-32 ASME   , 0.1120, 32.0000, 2.8450, 0.7940
    141:  6-32 ASME   , 0.1380, 32.0000, 3.5050, 0.7940
    142:  6-32 UNC    , 0.1380, 32.0000, 3.5000, 0.7940
    148:  0.148 GAS   , 0.1480, 32.0000, 3.7590, 0.7940
    151:  7-32 ASME   , 0.1510, 32.0000, 3.8350, 0.7940
    154:  5/32 CEI    , 0.1563, 32.0000, 3.9700, 0.7940
    161:  8-32 ASME   , 0.1640, 32.0000, 4.1660, 0.7940
    162:  8-32 UNC    , 0.1640, 32.0000, 4.1660, 0.7940
    168:  9-32 ASME   , 0.1770, 32.0000, 4.4960, 0.7940
    175:  3/16 CEI    , 0.1875, 32.0000, 4.7630, 0.7940
    176:  3/16 BSF    , 0.1880, 32.0000, 4.7630, 0.7940
    182:  10-32 ASME  , 0.1900, 32.0000, 4.8260, 0.7940
    183:  10-32 UNF   , 0.1900, 32.0000, 4.8260, 0.7940
    185:  0.196 GAS   , 0.1960, 32.0000, 4.9780, 0.7940
    187:  5 LOEW      , 0.1969, 31.8000, 5.0000, 0.8000
    188:  M5 Coarse   , 0.1970, 31.8000, 5.0000, 0.8000
    195:  12-32 ASME  , 0.2160, 32.0000, 5.4860, 0.7940
    460:  1/4 UNEF    , 0.2500, 32.0000, 6.3500, 0.7940
    461:  5/16 UNEF   , 0.3125, 32.0000, 7.9380, 0.7940
    462:  3/8 UNEF    , 0.3750, 32.0000, 9.5250, 0.7940
    463:  7/16 UNEF   , 0.4375, 32.0000, 11.1130, 0.7940
    (A,B,C,D,M,Q) ?


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    Last edited by mklotz; 06-19-2020 at 09:03 AM.
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