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Thread: Bridgeport head serial numbers?
11-02-2008, 05:11 PM #1
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.
11-02-2008, 05:31 PM #2
11-02-2008, 08:21 PM #3
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
11-05-2008, 10:34 PM #4
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
11-10-2008, 08:21 PM #5
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)
11-12-2008, 07:30 PM #6
Knee - Head
47368 - J36438
116018 - J104165
11-13-2008, 10:05 AM #7
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
11-24-2008, 03:44 PM #8
machine BR40482 1958
its a 9" knee with a 32" table
06-11-2009, 03:21 PM #9
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
10-20-2010, 05:26 AM #10
1976 model J head serial No's:
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.
10-20-2010, 11:52 AM #11
Do you go off the head or knee? Awhere do you find out what these # mean?
02-15-2012, 07:51 PM #12
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
03-23-2012, 06:35 PM #13
03-23-2012, 07:09 PM #14
No chrome on mine!
04-09-2014, 01:54 AM #15
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))
Bridgeport tooling door on the right side (Operator's left) of the base's turret column.
04-09-2014, 10:05 PM #16
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.