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  1. #1
    catch22 is offline Aluminum
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    Default Bridgeport head serial numbers?

    Does anyone know what serial number tells you the year of the head on a bridgeport series1 mill?
    There is a plate on the side of the variable speed head that says DRIVE SERIAL# 2JB S2163
    And on the front it has stamped JB35521 or JBB5521 im not sure if the third letter is a B or a 3. It is a 2hp variable speed head.

    Thanks Mike

  2. #2
    piniongear's Avatar
    piniongear is offline Stainless
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    Quote Originally Posted by catch22 View Post
    Does anyone know what serial number tells you the year of the head on a bridgeport series1 mill?
    There is a plate on the side of the variable speed head that says DRIVE SERIAL# 2JB S2163
    And on the front it has stamped JB35521 or JBB5521 im not sure if the third letter is a B or a 3. It is a 2hp variable speed head.

    Thanks Mike
    I have never seen such a listing telling when a head was manufactured.
    The mill itself is well documented by the serial number list we all have seen. I would be interested to see such a list if one exist..........pg

  3. #3
    ToughTool's Avatar
    ToughTool is offline Hot Rolled
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    We can all submit the head serial numbers (M and J) and the machine serial numbers and compile a list. Throw out the ones obvious out of sequence. If the machine has a good pedegree, like known to be the orginal head on the machine, It would give us an idea of their ages. Joe

  4. #4
    RLamparter is offline Cast Iron
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    Machine SN 12/BR 214985 - Mfd 1980 (on knee)
    Drive SN - 2J-95080 (right side of head)
    Front SN - J229423 (front of head)

    2J Head with 2 HP motor

  5. #5
    ToughTool's Avatar
    ToughTool is offline Hot Rolled
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    Machine SN BR/12 118867 - Mfd 1968 (on knee)
    2J Head SN - J120161 (casting, front of head)
    E Head SN - 4324 (Tag front of head)
    Joe

  6. #6
    SteveF is offline Stainless
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    I've got

    Knee - Head

    47368 - J36438

    116018 - J104165

    Steve.

  7. #7
    gpkull is offline Cast Iron
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    12/br 127363 on knee a 69 i think
    j 130062 on stamped plate under bp also same # punched into casting to the left of power feed lever

  8. #8
    solman's Avatar
    solman is offline Cast Iron
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    machine BR40482 1958
    head J29230
    its a 9" knee with a 32" table

  9. #9
    santal8 is offline Plastic
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    I have a 1982 Bridgeport step pulley head. I just bought a variable speed head with the number on the head being 312112. I would love to know what year the head was made....Any ideas? Thank You

  10. #10
    sceason is offline Plastic
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    1976 model J head serial No's:
    J-Head: 182838
    Knee Mill: 175795

    Machine age: *March-April, 1976

    *I calculated the month based on an average of number of machines built per year (divided by 12) from the published manufacturing tables correlated with their serial nos. My month may be slightly off. Prod. yr. is correct.

  11. #11
    blake in spokane is offline Hot Rolled
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    Do you go off the head or knee? Awhere do you find out what these # mean?

  12. #12
    Furpo's Avatar
    Furpo is offline Aluminum
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    Looks like this thread is getting old but I thought I would add mine anyway!
    I just bought a
    Knee BR162005 which should be 1974
    From the front of the head J28549

  13. #13
    KeythL is offline Plastic
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    Quote Originally Posted by Furpo View Post
    Looks like this thread is getting old but I thought I would add mine anyway!
    I just bought a
    Knee BR162005 which should be 1974
    From the front of the head J28549
    Interesting coincidence, I recently moved to Wisconsin and just picked up( today) a '74 Bridgeport Knee 163109, J252979. Does your's have chrome ways?

    Keyth

  14. #14
    Furpo's Avatar
    Furpo is offline Aluminum
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    No chrome on mine!

  15. #15
    Twinhit is offline Cast Iron
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    Machine SN 12/BR 114774 - Mfd 1968 (on knee)
    2J Head SN - J116118 (casting, front of head)
    Drive SN - 2J-5765 (Tag on quill feed side (left side/operator's right))
    1.5HP motor


    9x42 Table
    Manual feed

    Bridgeport tooling door on the right side (Operator's left) of the base's turret column.

  16. #16
    Mr Bridgeport is offline Stainless
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    Even Bridgeport never kept track of the SN on the heads. Thousands were sold loose and a bunch went on 2 or 3 headed tracers. Starting a registry like this is the only way to get some ideas of year of manufacture. And remember, swapping heads on machines is very common so a head or drive that looks out of sequence probably is. I've done it dozens of times per customer request.
    Bill

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