Cincinnati Milling & Grinding Machines Serial Numbers Index

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The following information on Cincinnati Milacron milling and grinding machines serial numbers is from the second edition of Cincinnati’s serial number index from 1953 that was not released into circulation.

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This is the most complete set of Cincinnati milling and grinding machine serial numbers I’ve ever seen, and this will continue to be a living and updated document as additional information is discovered. This includes significantly more serial numbers and information than the Serial Number Reference Book for Metalworking Machinery. I’ve included the original text from this document, and tried to organize it in a simpler format for online and mobile device viewing. If you have any additional information about Cincinnati serial numbers please comment below or contact us here.

We recently received a large amount of Cincinnati milling machine and grinding machine manuals, which we will be adding to our other Cincinnati operator and parts manuals here. We have some Cincinnati catalogs that you can download in pdf copies for free here, and we will be adding more to this selection over time as well.

From the Cincinnati Serial Number Index:

THE index contained herein will identify any standard machine tool manufactured by The Cincinnati Milling Machine Co., since the beginning of 1933. By referring to the code on the next page the reader may also ascertain the year of order booking and lot number of the specific machine in question.
Prior to 1933 several types of serial numbers were used. In general they involved the use of single prefix letters. Prior to 1912 a straight numerical sequence was used.

To identify machines not included in this index, or to learn any shipment date, write to the Order Department, Cincinnati Milling and Grinding Machines, Inc., Cincinnati 9, Ohio, Re. 2121, Teletype CI 27 7 , or direct Western Union Wire.

Second Edition, October, 1953

Copy No. 339

Charged to J. C. Cowan

Machine Model Information

The Wording—“THE OLD MARK” was placed in use during the year 1938 to establish a year model for each new design machine as indicated by the following example:

THE OLD MARK
123 456 7890

Year 1938—Model Machine “EA”

A machine newly designed in the year 1938 by Engineering Dept., and placed in production the same year or a later year—say 1939—would be Model “EA”—1938, or Model “ER”—1939.

Current model letters are also included for each machine listed.

The Cincinnati Serial Number

 

Here is a typical Cincinnati Serial Number:    4A3U1K-110

4A3U

This is the portion identified in the sections below. It is determined by the type, style, and size of the machine. Click on the section corresponding to the second letter. This code would be found in the “A Section”.

1K

This portion identifies the year of order booking according to the code below: Since the serial number is assigned at the order booking, the year of completion or of shipment may not always be the same as that indicated by this code. After 1953 all year codes start with number 5.

110

This is the 110th No. 3 Universal High Speed Dial Type Milling Machine (4A3U) order booked during “K” year (1941). It may have been completed one or even two years later. If there had been a major design change during the first year,“1K“would have changed to “2K”, and this sequence number would have started over.

1933....................A
1934....................B
1935....................C
1936....................D
1937....................E
1938....................F
1939....................H
1940....................J
1941....................K
1942....................L
1943....................M
1944....................P
1945....................R
1946....................S
1947....................T
1948....................U
1949....................V
1950....................W
1951....................Y
1952....................Z
1953...................5A
1954...................5B
1955...................5C
1956...................5D
1957...................5E
1958...................5F
1959...................5H
1960...................5J
1961...................5K
1962...................5L
1963...................5M
1964...................5P
1965...................5R
1966...................5S
1967...................5T
1968...................5U
1969...................5V
1970...................5W
1971...................5Y
1972...................5Z

In 1973 the system was again changed to the following: the last two digits preceding the dash indicate the year of manufacture and the letter code no longer applies.
Example: 49U78-000 Built 1978

Special Machines

Special CINCINNATI Machines which do not conform closely enough to any existing design are given the factory’s manufacturing order numbers for their serial numbers. These are usually six digits in length preceded by the year of order entry and a letter, and followed by a lot number, thus:

41B 426999-2

All that can be determined from this type of serial number is that here is a special Broaching machine first authorized for building in 1941, and that this is the second machine of the type built—probably in a later year. The authorization date (41) is no index to shipping date, which cannot be determined from the serial number. The letter “M” indicates milling or cutter sharpening, “G” indicates grinding and “B” indicates broaching.

Select section below corresponding to the 2nd letter in your serial number

to identify the type of Cincinnati machine.

*Machines were no longer being manufactured in 1953

*1A1P No. 1M-Type Plain Milling Machine
*1A2P No. 2M-Type Plain Milling Machine
*1A1U No. 1M-Type Universal Milling Machine
*1A2U No. 1M-Type Universal Milling Machine
*1A1V No. 1M-Type and 1MS (EA) Vertical Milling Machine
*1A2V No. 2M-Type and 2MS (EA) Vertical Milling Machine
*2A1P No. 1 Plain Medium Speed Dial Type Milling Machine—Model ER
2A2P No. 2 Plain Medium Speed Dial Type Milling Machine—Model OM
2A3P No. 3 Plain Medium Speed Dial Type Milling Machine—Model OM
2A4P No. 4 Plain Medium Speed Dial Type Milling Machine—Model OM
*2A1U No. 1 Universal Medium Speed Dial Type Milling Machine—Model ER
2A2U No. 2 Universal Medium Speed Dial Type Milling Machine—Model OM
2A3U No. 3 Universal Medium Speed Dial Type Milling Machine—Model OM
2A4U No. 4 Universal Medium Speed Dial Type Milling Machine—Model OM
*2A1V No. 1 Vertical Medium Speed Dial Type Milling Machine—Model ER
2A2V No. 2 Vertical Medium Speed Dial Type Milling Machine—Model OM
2A3V No. 3 Vertical Medium Speed Dial Type Milling-Machine—Model OM
2A4V No. 4 Vertical Medium Speed Dial Type Milling Machine—Model OM
*4A1P No. 1 Plain High Speed Dial Type Milling Machine—Model ER
4A2P No. 2 Plain High Speed Dial Type Milling Machine—Model OM
4A3P No. 3 Plain High Speed Dial Type Milling Machine—Model OM
4A4P No. 4 Plain High Speed Dial Type Milling Machine—Model OM
*4A1U No. 1 Universal High Speed Dial Type Milling Machine—Model
4A2U No. 2 Universal High Speed Dial Type Milling Machine—Model
4A3U No. 3 Universal High Speed Dial Type Milling Machine—Model
4A4U No. 4 Universal High Speed Dial Type Milling Machine—Model OM
*4A1V No. 1 Vertical High Speed Dial Type Milling Machine—Model ER
4A2V No. 2 Vertical High Speed Dial Type Milling Machine—Model OM
4A3V No. 3 Vertical High Speed Dial Type Milling Machine—Model OM
4A4V No. 4 Vertical High Speed Dial Type Milling Machine—Model OM
*5A2P No. 2 MH Plain Milling Machine—Model ED
*5A2U No. 2 MH Universal Milling Machine—Model ED
*8A4P No. 4 Plain High Power Milling Machine—Model HO
*8A5P No. 5 Plain High Power Milling Machine Model HO
*8A4U No. 4 Universal High Power Milling Machine—Model HO
*8A5U No. 5 Universal High Power Milling Machine—Model HO
*8A4V No. 4 Vertical High Power Milling Machine—Model HO
*9A2P No. 2L Plain Milling Machine—Model EL
*9A2U No. 2L Universal Milling Machine—Model EL
*9A1V No. 1L Vertical Milling Machine—Model EA
*9A2V No. 2L Vertical Milling Machine—Model EA
3B31P 42453 Plain Hydromatic Milling Machine—Model OL
3B32P 3-36 Plain Hydromatic Milling Machine—Model OL
3B33P 34-36 Plain Hydromatic Milling Machine—Model OL
3B34P 34-48 Plain Hydromatic Milling Machine—Model OL
3B35P 35-48 Plain Hydromatic Milling Machine—Model OL
3B36P 35-60 Plain Hydromatic Milling Machine—Model OL
3B37 P 36-72 Plain Hydromatic Milling Machine—Model OL
3B38P 36-90 Plain Hydromatic Milling Machine—Model OL
3B41P 4-36 Plain Hydromatic Milling Machine—Model OL
3B42P 4-48 Plain Hydromatic Milling Machine—Model OL
3B43P 45-48 Plain Hydromatic Milling Machine—Model OL
3B44P 45-60 Plain Hydromatic Milling Machine—Model OL
3B45P 46-72 Plain Hydromatic Milling Machine—Model OL
3B46P 40-90 Plain Hydromatic Milling Machine—Model OL
3B51P 5-48 Plain Hydromatic Milling Machine—Model OL
3B52P 5-60 Plain Hydromatic Milling Machine—Model OL
3B53P 56-72 Plain Hydromatic Milling Machine—Model OL
3B54P 56-90 Plain Hydromatic Milling Machine—Model OL
3B31D 3-24 Duplex Hydromatic Milling Machine—Model OL
3B32D 3-36 Duplex Hydromatic Milling Machine—Model OL
3B33D 34-36 Duplex Hydromatic Milling Machine—Model OL
3B34D 34-48 Duplex Hydromatic Milling Machine—Model OL
3B35D 35-48 Duplex Hydromatic Milling Machine—Model OL
3B36D 35-60 Duplex Hydromatic Milling Machine—Model OL
3B37D 36-72 Duplex Hydromatic Milling Machine—Model OL
3B38D 36-90 Duplex Hydromatic Milling Machine—Model OL
3B41D 4-36 Duplex Hydromatic Milling Machine—Model OL
3B42D 4-48 Duplex Hydromatic Milling Machine—Model OL
3B43D 45-48 Duplex Hydromatic Milling Machine—Model OL
3B44D 45-60 Duplex Hydromatic Milling Machine—Model OL
3B45D 46-72 Duplex Hydromatic Milling Machine—Model OL
3B46D 46-90 Duplex Hydromatic Milling Machine—Model OL
3B51D 5-48 Duplex Hydromatic Milling Machine—Model OL
3B52D 5-60 Duplex Hydromatic Milling Machine—Model OL
3B53D 56-72 Duplex Hydromatic Milling Machine—Model OL
3B54D 56-90 Duplex Hydromatic Milling Machine—Model OL
4B31P 3-24 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B32P 3-36 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B33P 34-36 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B34P 34-48 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B35P 35-48 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B36P 35-60 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B37P 36-72 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B38P 36-90 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B41P 4-36 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B42P 4-48 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B43P 45-48 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B44P 45-60 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B45P 46-72 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B46P 46-90 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B51P 5-48 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B52P 5-60 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B53P 56-72 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B54P 56-90 Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B31D 3-24 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B32D 3-36 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B33D 34-36 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B34D 34-48 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B35D 35-48 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B36D 35-60 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B37D 36-72 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B38D 36-90 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B41D 4-36 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B42D 4-48 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B43D 45-48 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B44D 45-60 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B45D 46-72 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B46D 46-90 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B51D 5-48 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B52D 5-60 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B53D 56-72 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B54D 56-90 Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
5B3P No. 2-24 Plain Rise and Fall Automatic Milling Machine—Model OM
5B3D N0. 2-24 Duplex Rise and Fall Automatic Milling Machine-—Model OM
1C1V 4 Spindle 360° Automatic Profiler—Model OT
4C1V 12″ Hydroform Machine—Model LK
5C1C No. 2 Flamatic Hardening Machine—Model OM
1D2T N0. 2 Plain and Universal Cutter and Tool Grinders—Model OM
2D1C Monoset Cutter and Tool Grinder—Model OE
3D1C Contour Cutter Sharpening Machine—Model OO
5D1C Projecto-Form Grinder—Model OR
*1E1V 2-Ton Single Ram Vertical Broaching Machine
*1E2V 5-Ton Single Ram Vertical Broaching Machine—Model ER
*1E3V 10-Ton Single Ram Vertical Broaching Machine—Model ER
*1E4V 3-Ton Single Ram Vertical Broaching Machine—Model ER
*2E1V 2-Ton Duplex Vertical Broaching Machine—Model ER
*2E2V 5-Ton Duplex Vertical Broaching Machine—Model ER
*2E3V 10-Ton Duplex Vertical Broaching Machine—Model ER
*2E4V 3-Ton Duplex Vertical Broaching Machine—Model ER
3E1V 3-Ton Single Ram Vertical Broaching Machine—Model OK
3E2V 5-Ton Single Ram Vertical Broaching Machine—Model OK
3E3V 10-Ton Single Ram Vertical Broaching Machine—Model OK
4E1V 3-Ton Duplex Vertical Broaching Machine—Model LK
4E2V 3-Ton Duplex Vertical Broaching Machine—Model LK
4E3V 3-Ton Duplex Vertical Broaching Machine—Model LK
5E1V 1-Ton Single Ram Vertical Broaching Machine—Model ER
6E1V 1-Ton Duplex Vertical Broaching Machine—Model ER
*1F1P 18″ Plain Manufacturing Milling Machine—Model OK
2F1P 1-12 and 1-18 Plain Automatic Milling Machine—Model EA
*3F1P O-8 Plain Automatic Milling Machine—Model EA
*3F2C O-8 Plain Rise and Fall Milling Machine—Model EA
4F1V O-8 Vertical Milling Machine—Model EA
5F1P O-8 Plain Automatic Milling Machine—Model OL
5F1C O-8 Plain Rise and Fall Milling Machine—Model OL
6F1P OOO-4 Unit Type Milling Machine (Single Unit)—Model OA
6F2P OOO-4 Unit Type Milling Machine (Double Unit)—Model OA
6F4P OOO-4 Unit Type Milling Machine (Quadruple Unit)—Model OA
*1H1V 28″ Vertical Hydro-Tel Milling Machines—Model EM. (All Machines built prior to
May 1, 1943 were given this serial number regardless of the length of table travel).
1H2V 28″ x 48″ Vertical Hydro-Tel Milling Machine—Model EM
1H3V 28″ x 60″ Vertical Hydro-Tel Milling Machine—Model EM
1H4V 28″ x 72″ Vertical Hydro-Tel Milling Machine—Model EM
1H5V Z8″ x 84″ Vertical Hydro-Tel Milling Machine—Model EM
1H6V 28″ x 96″ Vertical Hydro-Tel Milling Machine—Model EM
1H7V Z8″ x 108″ Vertical Hydro-Tel Milling Machine—Model EM
1H8V 28″ x 120″ (205″ Bed) Vertical Hydro-Tel Milling Machine—Model EM
1H9V 28″ x 120″ (271″ Bed) Vertical Hydro-Tel Milling Machine—Model EM
2H1H 36″ x 72″ Horizontal Hydro-Tel Milling Machine—Model OK
2H2H 36″ x 120″ Horizontal Hydro-Tel Milling Machine—Model OK
3H1V 16″ x 30″ Vertical Hydro-Tel Milling Machine—Model OE
4H1V 8″ x 18″ Tool and Die Milling Machine—Model OM
2J2P No. 2 MI Plain Milling Machine—Model OO
2J3P No. 3 MI Plain Milling Machine—Model OR
2J2U No. 2 Ml Universal Milling Machine—Model OO
2J3U No. 3 MI Universal Milling Machine—Model OR
2J2V No. 2 MI Vertical Milling Machine—Model OO
3J3P No. 3 Plain Dual Power Dial Type Milling Machine—Model OD
3J4P No. 4 Plain Dual Power Dial Type Milling Machine—Model OD
3J5P No. 5 Plain Dual Power Dial Type Milling Machine—Model OD
3J6P No. 6 Plain Dual Power Dial Type Milling Machine—Model OD
3J3U No. 3 Universal Dual Power Dial Type Milling Machine—Model OD
3J4U No. 4 Universal Dual Power Dial Type Milling Machine—Model OD
3J5U No. 5 Universal Dual Power Dial Type Milling Machine—Model OD
3J3U No. 3 Vertical Dual Power Dial Type Milling Machine—Model OD
3J4U No. 4 Vertical Dual Power Dial Type Milling Machine—Model OD
3J5U No. 5 Vertical Dual Power Dial Type Milling Machine—Model OD
3J6U No. 6 Vertical Dual Power Dial Type Milling Machine—Model OD
4J3P No. 3 Plain High Power Dial Type Milling Machine—Model O
4J4P No. 4 Plain High Power Dial Type Milling Machine—Model O
4J5P No. 5 Plain High Power Dial Type Milling Machine—Model O
4J6P No. 6 Plain High Power Dial Type Milling Machine—Model O
4J3P No. 3 Universal High Power Dial Type Milling Machine—Model OD
4J4U No. 4 Universal High Power Dial Type Milling Machine—Model OD
4J5U No. 5 Universal High Power Dial Type Milling Machine—Model OD
4J3V No. 3 Vertical High Power Dial Type Milling Machine—Model OD
4J4V No. 4 Vertical High Power Dial Type Milling Machine—Model OD
4 J5V No. 5 Vertical High Power Dial Type Milling Machine—Model OD
4J6V No. 6 Vertical High Power Dial Type Milling Machine—Model OD
5J2P No. 2 ML Plain Milling Machine—Model OO
5J2U No. 2 ML Universal Milling Machine—Model OO
*1L1C 8″ Flamatic Hardening Machine—Model OM
Changed to read 5C1C March 3rd, 1952, due to the same serial number being used by
Cincinnati Lathe and Tool Co.
1M1H N0. O Centerless Grinding Machine—Model EA
2M2H N0. 2 Centerless Grinding Machine—Model OM
3M3H N0. 3 Centerless Grinding Machine—Model EA
3M4H N0. 4 Centerless Grinding Machine—Model ER
4M5V No. 5 Centerless Grinding Machine—Model EO
4M6V N0. 6 Genterless Grinding Machine—Model EO
5M2H Centerless Lapping Machine—Model ED
*1P4A 14″x 18″ Plain Self Contained Grinding Machine—Model EM
*1P5A 16″x 18″ Plain Self Contained Grinding Machine—Model EM
1P4D 14″x 63″ Plain Grinding Machine—Model OM
1P5D 16″x 36″ Plain Grinding Machine—Model OM
1P4E 14″x 48″ Plain Grinding Machine—Model OM
1P5E 16″x 48″ Plain Grinding Machine—Model OM
1P4F 14″x 72″ Plain Grinding Machine—Model OM
1P5F 16″x 72″ Plain Grinding Machine—Model OM
1P4H 14″x 96″ Plain Grinding Machine—Model OM
1P5H 16″x 96″ Plain Grinding Machine—Model OM
1P4J 14″x 120″ Plain Grinding Machine—Model OM
1P5J 16″x 120″ Plain Grinding Machine—Model OM
1P4K 14″x 144″ Plain Grinding Machine—Model OM
1P5K 16″x 144″ Plain Grinding Machine—Model OM
1P4L 14″x 168″ Plain Grinding Machine—Model OM
1P5L 16″x 168″ Plain Grinding Machine—Model OM
2P0A 4″x 18″ Plain Hydraulic Grinding Machine—Model OH
2P0W 4″x 12″ Plain Hydraulic Grinding Machine—Model OH
3P1A 6″x 18″ Plain Hydraulic Grinding Machine—Model ER
3P2A 10″x 18″ Plain Hydraulic Grinding Machine—Model ER
3P1C 6″x 30″ Plain Hydraulic Grinding Machine—Model ER
3P2D 10″x 36″ Plain Hydraulic Grinding Machine—Model ER
3P2E 10″x 48″ Plain Hydraulic Grinding Machine—Model ER
3P2F 10″x 72″ Plain Hydraulic Grinding Machine—Model ER
3P2H 10″x 96″ Plain Hydraulic Grinding Machine—Model ER
*5P1A 6″x 18″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P2A 10″x 18″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P1C 6″x 30″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P2D 10″x 36″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
6P2A 10″x 18″ L Plain Hydraulic Grinding Machine—Model OE
6P4A 14″x 18″ L Plain Hydraulic Grinding Machine—Model OE
6P2C 10″x 30″ L Plain Hydraulic Grinding Machine—Model OE
6P2D 14″x 36″ L Plain Hydraulic Grinding Machine—Model OE
6P4E 14″x 48″ L Plain Hydraulic Grinding Machine—Model OE
6P4F 14″x 72″ L Plain Hydraulic Grinding Machine—Model OE
6P4H 14″x 96″ L Plain Hydraulic Grinding Machine—Model OE
7P5E 16″x 48″ Heavy Duty Plain Grinding Machine—Model OM
7P6E 20″x 48″ Plain Grinding Machine—Model OM
7P7E 24″x 48″ Plain Grinding Machine—Model OM
7P5F 16″x 72″ Heavy Duty Plain Grinding Machine—Model OM
7P6F 20″x 72″ Plain Grinding Machine—Model OM
7P7F 24″x 72″ Plain Grinding Machine—Model OM
7P5H 16″x 96″ Heavy Duty Plain Grinding Machine—Model OM
7P6H 20″x 96″ Plain Grinding Machine—Model OM
7P7H 24″x 96″ Plain Grinding Machine—Model OM
7P5J 16″x 120″ Heavy Duty Plain Grinding Machine—Model OM
7P6J 20″x 120″ Plain Grinding Machine—Model OM
7P7J 24″x 120″ Plain Grinding Machine—Model OM
7P5K 16″x 144″ Heavy Duty Plain Grinding Machine—Model OM
7P6K 20″x 144″ Plain Grinding Machine—Model OM
7P7K 24″x 144″ Plain Grinding Machine—Model OM
7P5L 16″x 168″ Heavy Duty Plain Grinding Machine—Model OM
7P6L 20″x 168″ Plain Grinding Machine—Model OM
7P7L 24″x 168″ Plain Grinding Machine—Model OM
7P5M 16″x 192″ Heavy Duty Plain Grinding Machine—Model OM
7P6M 20″x 192″ Plain Grinding Machine—Model OM
7P7M 24″x 192″ Plain Grinding Machine—Model OM
8P6H 20″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P7H 24″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P8H 28″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P6J 20″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P7J 24″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P8 J 28″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P6K 20″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P7K 24″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P8K 28″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P6L 20″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P7L 24″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P8L 28″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P6M 20″x 192″ Heavy Duty Plain Grinding Machine—Model OM
8P7M 24″x 192″ Heavy Duty Plain Grinding Machine—Model OM
8P8M 28″x 192″ Heavy Duty Plain Grinding Machine—Model OM
3R6H 20″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R7H 24″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R8H 28″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R6J 20″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R7J 24″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R8J 28″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R6K 20″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R7K 24″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R8K 28″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R6L 20″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R7L 24″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R8L 28″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R6M 20″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R7M 24″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R8M 28″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R6P 20″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R7P 24″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R8P 28″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R6R 20″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R7R 24″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R8R 28″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R6S 20″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R7S 24″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R8S 28″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R6T 20″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R7T 24″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R8T 28″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R6U 20″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R7U 24″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R8U 28″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R6V 20″x 336″ Heavy Duty Roll Grinding Machine—Model OK
3R7V 24″x 336″ Heavy Duty Roll Grinding Machine—Model OK
3R8V 28″x 336″ Heavy Duty Roll Grinding Machine—Model OK
4R5E 16″x 48″ Roll Grinding Machine—Model OM
4R6E 20″x 48″ Roll Grinding Machine—Model OM
4R7E 24″x 48″ Roll Grinding Machine—Model OM
4R5F 16″x 72″ Roll Grinding Machine—Model OM
4R6F 20″x 72″ Roll Grinding Machine—Model OM
4R7F 24″x 72″ Roll Grinding Machine—Model OM
4R5H 16″x 96″ Roll Grinding Machine—Model OM
4R6H 20″x 96″ Roll Grinding Machine—Model OM
4R7H 24″x 96″ Roll Grinding Machine—Model OM
4R5J 16″x 120″ Roll Grinding Machine—Model OM
4R6J 20″x 120″ Roll Grinding Machine—Model OM
4R7J 24″x 120″ Roll Grinding Machine—Model OM
4R5K 16″x 144″ Roll Grinding Machine—Model OM
4R6K 20″x 144″ Roll Grinding Machine—Model OM
4R7K 24″x 144″ Roll Grinding Machine—Model OM
4R5L 16″x 168″ Roll Grinding Machine—Model OM
4R6L 20″x 168″ Roll Grinding Machine—Model OM
4R7L 24″x 168″ Roll Grinding Machine—Model OM
4R5M 16″x 192″ Roll Grinding Machine—Model OM
4R6M 20″x 192″ Roll Grinding Machine—Model OM
4R7M 24″x 192″ Roll Grinding Machine—Model OM
*1T1H No. 1 Chucking Grinding Machine—Model ER
2T1H No. 1 Micro-Centric Grinding Machine—Model OM
2T2H No. 2 Micro-Centric Grinding Machine—Model OM
3T1H No. 1 Chucking Grinding Machine—Model OM
3T2H No. 2 Chucking Grinding Machine—Model OM
*1U3B 12”x 24” Universal Self Contained Grinding Machine—Model EA
*1U3D 12″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U4D 14″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U5D 16″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U3E 12″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U4E 14″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U5E 16″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U3F 12″x 72″ Universal Self Contained Grinding Machine—Model EA
*1U4F 14″x 72″ Universal Self Contained Grinding Machine—Model EA
*1U5F 16″x 72″ Universal Self Contained Grinding Machine—Model EA
2U3B 12″x 24″ Universal Hydraulic Grinding Machine—Model ER
2U3D 12″x 36″ Universal Hydraulic Grinding Machine—Model ER
2U3E 12″x 48″ Universal Hydraulic Grinding Machine—Model ER
2U3F 12″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U4B 14″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U5B 16″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U6B 18″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U4D 14″x 36″ Universal Hydraulic Grinding Machine—M0del ER
3U5D 16″x 36″ Universal Hydraulic Grinding Machine—Model ER
3U6D 18″x 36″ Universal Hydraulic Grinding Machine—Model ER
3U4E 14″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U5E 16″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U6E 18″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U4F 14″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U5F 16″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U6F 18″x 7 2″ Universal Hydraulic Grinding Machine—Model ER
4U2B 10″x 24″ Universal Hydraulic Grinding Machine—Model ER

If you have any additional information, feedback, or edits, please comment below or contact us, and share this with your friends or anyone else you know that may have a Cincinnati machine. We really want to hear from you. Also, we would love to see pictures of your Cincinnati machines to display them here.

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5 thoughts on “Cincinnati Milling & Grinding Machines Serial Numbers Index

    • Hi Ian, Are you certain that the first and fifth number are both a 6? I’m fairly certain the fifth one can’t be a 6, but maybe a 5. I’m not so certain about the first number.

  1. I have a Cincinnati vertical milling machine and i’m looking for a service manual.
    the number is 3J5VIT-3-RC-75.
    I was unable to find this number in your index, i would appreciate any help you can give
    I have pics if you would like to see

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