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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

*1A1PNo. 1M-Type Plain Milling Machine
*1A2PNo. 2M-Type Plain Milling Machine
*1A1UNo. 1M-Type Universal Milling Machine
*1A2UNo. 1M-Type Universal Milling Machine
*1A1VNo. 1M-Type and 1MS (EA) Vertical Milling Machine
*1A2VNo. 2M-Type and 2MS (EA) Vertical Milling Machine
*2A1PNo. 1 Plain Medium Speed Dial Type Milling Machine—Model ER
2A2PNo. 2 Plain Medium Speed Dial Type Milling Machine—Model OM
2A3PNo. 3 Plain Medium Speed Dial Type Milling Machine—Model OM
2A4PNo. 4 Plain Medium Speed Dial Type Milling Machine—Model OM
*2A1UNo. 1 Universal Medium Speed Dial Type Milling Machine—Model ER
2A2UNo. 2 Universal Medium Speed Dial Type Milling Machine—Model OM
2A3UNo. 3 Universal Medium Speed Dial Type Milling Machine—Model OM
2A4UNo. 4 Universal Medium Speed Dial Type Milling Machine—Model OM
*2A1VNo. 1 Vertical Medium Speed Dial Type Milling Machine—Model ER
2A2VNo. 2 Vertical Medium Speed Dial Type Milling Machine—Model OM
2A3VNo. 3 Vertical Medium Speed Dial Type Milling-Machine—Model OM
2A4VNo. 4 Vertical Medium Speed Dial Type Milling Machine—Model OM
*4A1PNo. 1 Plain High Speed Dial Type Milling Machine—Model ER
4A2PNo. 2 Plain High Speed Dial Type Milling Machine—Model OM
4A3PNo. 3 Plain High Speed Dial Type Milling Machine—Model OM
4A4PNo. 4 Plain High Speed Dial Type Milling Machine—Model OM
*4A1UNo. 1 Universal High Speed Dial Type Milling Machine—Model
4A2UNo. 2 Universal High Speed Dial Type Milling Machine—Model
4A3UNo. 3 Universal High Speed Dial Type Milling Machine—Model
4A4UNo. 4 Universal High Speed Dial Type Milling Machine—Model OM
*4A1VNo. 1 Vertical High Speed Dial Type Milling Machine—Model ER
4A2VNo. 2 Vertical High Speed Dial Type Milling Machine—Model OM
4A3VNo. 3 Vertical High Speed Dial Type Milling Machine—Model OM
4A4VNo. 4 Vertical High Speed Dial Type Milling Machine—Model OM
*5A2PNo. 2 MH Plain Milling Machine—Model ED
*5A2UNo. 2 MH Universal Milling Machine—Model ED
*8A4PNo. 4 Plain High Power Milling Machine—Model HO
*8A5PNo. 5 Plain High Power Milling Machine Model HO
*8A4UNo. 4 Universal High Power Milling Machine—Model HO
*8A5UNo. 5 Universal High Power Milling Machine—Model HO
*8A4VNo. 4 Vertical High Power Milling Machine—Model HO
*9A2PNo. 2L Plain Milling Machine—Model EL
*9A2UNo. 2L Universal Milling Machine—Model EL
*9A1VNo. 1L Vertical Milling Machine—Model EA
*9A2VNo. 2L Vertical Milling Machine—Model EA
3B31P42453Plain Hydromatic Milling Machine—Model OL
3B32P3-36Plain Hydromatic Milling Machine—Model OL
3B33P34-36Plain Hydromatic Milling Machine—Model OL
3B34P34-48Plain Hydromatic Milling Machine—Model OL
3B35P35-48Plain Hydromatic Milling Machine—Model OL
3B36P35-60Plain Hydromatic Milling Machine—Model OL
3B37 P36-72Plain Hydromatic Milling Machine—Model OL
3B38P36-90Plain Hydromatic Milling Machine—Model OL
3B41P4-36Plain Hydromatic Milling Machine—Model OL
3B42P4-48Plain Hydromatic Milling Machine—Model OL
3B43P45-48Plain Hydromatic Milling Machine—Model OL
3B44P45-60Plain Hydromatic Milling Machine—Model OL
3B45P46-72Plain Hydromatic Milling Machine—Model OL
3B46P40-90Plain Hydromatic Milling Machine—Model OL
3B51P5-48Plain Hydromatic Milling Machine—Model OL
3B52P5-60Plain Hydromatic Milling Machine—Model OL
3B53P56-72Plain Hydromatic Milling Machine—Model OL
3B54P56-90Plain Hydromatic Milling Machine—Model OL
3B31D3-24Duplex Hydromatic Milling Machine—Model OL
3B32D3-36Duplex Hydromatic Milling Machine—Model OL
3B33D34-36Duplex Hydromatic Milling Machine—Model OL
3B34D34-48Duplex Hydromatic Milling Machine—Model OL
3B35D35-48Duplex Hydromatic Milling Machine—Model OL
3B36D35-60Duplex Hydromatic Milling Machine—Model OL
3B37D36-72Duplex Hydromatic Milling Machine—Model OL
3B38D36-90Duplex Hydromatic Milling Machine—Model OL
3B41D4-36Duplex Hydromatic Milling Machine—Model OL
3B42D4-48Duplex Hydromatic Milling Machine—Model OL
3B43D45-48Duplex Hydromatic Milling Machine—Model OL
3B44D45-60Duplex Hydromatic Milling Machine—Model OL
3B45D46-72Duplex Hydromatic Milling Machine—Model OL
3B46D46-90Duplex Hydromatic Milling Machine—Model OL
3B51D5-48Duplex Hydromatic Milling Machine—Model OL
3B52D5-60Duplex Hydromatic Milling Machine—Model OL
3B53D56-72Duplex Hydromatic Milling Machine—Model OL
3B54D56-90Duplex Hydromatic Milling Machine—Model OL
4B31P3-24Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B32P3-36Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B33P34-36Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B34P34-48Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B35P35-48Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B36P35-60Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B37P36-72Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B38P36-90Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B41P4-36Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B42P4-48Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B43P45-48Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B44P45-60Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B45P46-72Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B46P46-90Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B51P5-48Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B52P5-60Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B53P56-72Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B54P56-90Plain Tracer Controlled Hydromatic Milling Machine—Model OL
4B31D3-24Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B32D3-36Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B33D34-36Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B34D34-48Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B35D35-48Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B36D35-60Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B37D36-72Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B38D36-90Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B41D4-36Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B42D4-48Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B43D45-48Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B44D45-60Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B45D46-72Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B46D46-90Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B51D5-48Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B52D5-60Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B53D56-72Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
4B54D56-90Duplex Tracer Controlled Hydromatic Milling Machine—Model OL
5B3PNo. 2-24 Plain Rise and Fall Automatic Milling Machine—Model OM
5B3DN0. 2-24 Duplex Rise and Fall Automatic Milling Machine-—Model OM
1C1V4 Spindle 360° Automatic Profiler—Model OT
4C1V12″ Hydroform Machine—Model LK
5C1CNo. 2 Flamatic Hardening Machine—Model OM
1D2TN0. 2 Plain and Universal Cutter and Tool Grinders—Model OM
2D1CMonoset Cutter and Tool Grinder—Model OE
3D1CContour Cutter Sharpening Machine—Model OO
5D1CProjecto-Form Grinder—Model OR
*1E1V2-Ton Single Ram Vertical Broaching Machine
*1E2V5-Ton Single Ram Vertical Broaching Machine—Model ER
*1E3V10-Ton Single Ram Vertical Broaching Machine—Model ER
*1E4V3-Ton Single Ram Vertical Broaching Machine—Model ER
*2E1V2-Ton Duplex Vertical Broaching Machine—Model ER
*2E2V5-Ton Duplex Vertical Broaching Machine—Model ER
*2E3V10-Ton Duplex Vertical Broaching Machine—Model ER
*2E4V3-Ton Duplex Vertical Broaching Machine—Model ER
3E1V3-Ton Single Ram Vertical Broaching Machine—Model OK
3E2V5-Ton Single Ram Vertical Broaching Machine—Model OK
3E3V10-Ton Single Ram Vertical Broaching Machine—Model OK
4E1V3-Ton Duplex Vertical Broaching Machine—Model LK
4E2V3-Ton Duplex Vertical Broaching Machine—Model LK
4E3V3-Ton Duplex Vertical Broaching Machine—Model LK
5E1V1-Ton Single Ram Vertical Broaching Machine—Model ER
6E1V1-Ton Duplex Vertical Broaching Machine—Model ER
*1F1P18″ Plain Manufacturing Milling Machine—Model OK
2F1P1-12 and 1-18 Plain Automatic Milling Machine—Model EA
*3F1PO-8 Plain Automatic Milling Machine—Model EA
*3F2CO-8 Plain Rise and Fall Milling Machine—Model EA
4F1VO-8 Vertical Milling Machine—Model EA
5F1PO-8 Plain Automatic Milling Machine—Model OL
5F1CO-8 Plain Rise and Fall Milling Machine—Model OL
6F1POOO-4 Unit Type Milling Machine (Single Unit)—Model OA
6F2POOO-4 Unit Type Milling Machine (Double Unit)—Model OA
6F4POOO-4 Unit Type Milling Machine (Quadruple Unit)—Model OA
*1H1V28″ 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).
1H2V28″ x 48″ Vertical Hydro-Tel Milling Machine—Model EM
1H3V28″ x 60″ Vertical Hydro-Tel Milling Machine—Model EM
1H4V28″ x 72″ Vertical Hydro-Tel Milling Machine—Model EM
1H5VZ8″ x 84″ Vertical Hydro-Tel Milling Machine—Model EM
1H6V28″ x 96″ Vertical Hydro-Tel Milling Machine—Model EM
1H7VZ8″ x 108″ Vertical Hydro-Tel Milling Machine—Model EM
1H8V28″ x 120″ (205″ Bed) Vertical Hydro-Tel Milling Machine—Model EM
1H9V28″ x 120″ (271″ Bed) Vertical Hydro-Tel Milling Machine—Model EM
2H1H36″ x 72″ Horizontal Hydro-Tel Milling Machine—Model OK
2H2H36″ x 120″ Horizontal Hydro-Tel Milling Machine—Model OK
3H1V16″ x 30″ Vertical Hydro-Tel Milling Machine—Model OE
4H1V8″ x 18″ Tool and Die Milling Machine—Model OM
2J2PNo. 2 MI Plain Milling Machine—Model OO
2J3PNo. 3 MI Plain Milling Machine—Model OR
2J2UNo. 2 Ml Universal Milling Machine—Model OO
2J3UNo. 3 MI Universal Milling Machine—Model OR
2J2VNo. 2 MI Vertical Milling Machine—Model OO
3J3PNo. 3 Plain Dual Power Dial Type Milling Machine—Model OD
3J4PNo. 4 Plain Dual Power Dial Type Milling Machine—Model OD
3J5PNo. 5 Plain Dual Power Dial Type Milling Machine—Model OD
3J6PNo. 6 Plain Dual Power Dial Type Milling Machine—Model OD
3J3UNo. 3 Universal Dual Power Dial Type Milling Machine—Model OD
3J4UNo. 4 Universal Dual Power Dial Type Milling Machine—Model OD
3J5UNo. 5 Universal Dual Power Dial Type Milling Machine—Model OD
3J3UNo. 3 Vertical Dual Power Dial Type Milling Machine—Model OD
3J4UNo. 4 Vertical Dual Power Dial Type Milling Machine—Model OD
3J5UNo. 5 Vertical Dual Power Dial Type Milling Machine—Model OD
3J6UNo. 6 Vertical Dual Power Dial Type Milling Machine—Model OD
4J3PNo. 3 Plain High Power Dial Type Milling Machine—Model O
4J4PNo. 4 Plain High Power Dial Type Milling Machine—Model O
4J5PNo. 5 Plain High Power Dial Type Milling Machine—Model O
4J6PNo. 6 Plain High Power Dial Type Milling Machine—Model O
4J3PNo. 3 Universal High Power Dial Type Milling Machine—Model OD
4J4UNo. 4 Universal High Power Dial Type Milling Machine—Model OD
4J5UNo. 5 Universal High Power Dial Type Milling Machine—Model OD
4J3VNo. 3 Vertical High Power Dial Type Milling Machine—Model OD
4J4VNo. 4 Vertical High Power Dial Type Milling Machine—Model OD
4 J5VNo. 5 Vertical High Power Dial Type Milling Machine—Model OD
4J6VNo. 6 Vertical High Power Dial Type Milling Machine—Model OD
5J2PNo. 2 ML Plain Milling Machine—Model OO
5J2UNo. 2 ML Universal Milling Machine—Model OO
*1L1C8″ 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.
1M1HN0. O Centerless Grinding Machine—Model EA
2M2HN0. 2 Centerless Grinding Machine—Model OM
3M3HN0. 3 Centerless Grinding Machine—Model EA
3M4HN0. 4 Centerless Grinding Machine—Model ER
4M5VNo. 5 Centerless Grinding Machine—Model EO
4M6VN0. 6 Genterless Grinding Machine—Model EO
5M2HCenterless Lapping Machine—Model ED
*1P4A14″x 18″ Plain Self Contained Grinding Machine—Model EM
*1P5A16″x 18″ Plain Self Contained Grinding Machine—Model EM
1P4D14″x 63″ Plain Grinding Machine—Model OM
1P5D16″x 36″ Plain Grinding Machine—Model OM
1P4E14″x 48″ Plain Grinding Machine—Model OM
1P5E16″x 48″ Plain Grinding Machine—Model OM
1P4F14″x 72″ Plain Grinding Machine—Model OM
1P5F16″x 72″ Plain Grinding Machine—Model OM
1P4H14″x 96″ Plain Grinding Machine—Model OM
1P5H16″x 96″ Plain Grinding Machine—Model OM
1P4J14″x 120″ Plain Grinding Machine—Model OM
1P5J16″x 120″ Plain Grinding Machine—Model OM
1P4K14″x 144″ Plain Grinding Machine—Model OM
1P5K16″x 144″ Plain Grinding Machine—Model OM
1P4L14″x 168″ Plain Grinding Machine—Model OM
1P5L16″x 168″ Plain Grinding Machine—Model OM
2P0A4″x 18″ Plain Hydraulic Grinding Machine—Model OH
2P0W4″x 12″ Plain Hydraulic Grinding Machine—Model OH
3P1A6″x 18″ Plain Hydraulic Grinding Machine—Model ER
3P2A10″x 18″ Plain Hydraulic Grinding Machine—Model ER
3P1C6″x 30″ Plain Hydraulic Grinding Machine—Model ER
3P2D10″x 36″ Plain Hydraulic Grinding Machine—Model ER
3P2E10″x 48″ Plain Hydraulic Grinding Machine—Model ER
3P2F10″x 72″ Plain Hydraulic Grinding Machine—Model ER
3P2H10″x 96″ Plain Hydraulic Grinding Machine—Model ER
*5P1A6″x 18″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P2A10″x 18″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P1C6″x 30″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
*5P2D10″x 36″ Plain (Saddle Type) Hydraulic Grinding Machine—Model EA
6P2A10″x 18″ L Plain Hydraulic Grinding Machine—Model OE
6P4A14″x 18″ L Plain Hydraulic Grinding Machine—Model OE
6P2C10″x 30″ L Plain Hydraulic Grinding Machine—Model OE
6P2D14″x 36″ L Plain Hydraulic Grinding Machine—Model OE
6P4E14″x 48″ L Plain Hydraulic Grinding Machine—Model OE
6P4F14″x 72″ L Plain Hydraulic Grinding Machine—Model OE
6P4H14″x 96″ L Plain Hydraulic Grinding Machine—Model OE
7P5E16″x 48″ Heavy Duty Plain Grinding Machine—Model OM
7P6E20″x 48″ Plain Grinding Machine—Model OM
7P7E24″x 48″ Plain Grinding Machine—Model OM
7P5F16″x 72″ Heavy Duty Plain Grinding Machine—Model OM
7P6F20″x 72″ Plain Grinding Machine—Model OM
7P7F24″x 72″ Plain Grinding Machine—Model OM
7P5H16″x 96″ Heavy Duty Plain Grinding Machine—Model OM
7P6H20″x 96″ Plain Grinding Machine—Model OM
7P7H24″x 96″ Plain Grinding Machine—Model OM
7P5J16″x 120″ Heavy Duty Plain Grinding Machine—Model OM
7P6J20″x 120″ Plain Grinding Machine—Model OM
7P7J24″x 120″ Plain Grinding Machine—Model OM
7P5K16″x 144″ Heavy Duty Plain Grinding Machine—Model OM
7P6K20″x 144″ Plain Grinding Machine—Model OM
7P7K24″x 144″ Plain Grinding Machine—Model OM
7P5L16″x 168″ Heavy Duty Plain Grinding Machine—Model OM
7P6L20″x 168″ Plain Grinding Machine—Model OM
7P7L24″x 168″ Plain Grinding Machine—Model OM
7P5M16″x 192″ Heavy Duty Plain Grinding Machine—Model OM
7P6M20″x 192″ Plain Grinding Machine—Model OM
7P7M24″x 192″ Plain Grinding Machine—Model OM
8P6H20″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P7H24″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P8H28″x 96″ Heavy Duty Plain Grinding Machine—Model OM
8P6J20″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P7J24″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P8 J28″x 120″ Heavy Duty Plain Grinding Machine—Model OM
8P6K20″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P7K24″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P8K28″x 144″ Heavy Duty Plain Grinding Machine—Model OM
8P6L20″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P7L24″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P8L28″x 168″ Heavy Duty Plain Grinding Machine—Model OM
8P6M20″x 192″ Heavy Duty Plain Grinding Machine—Model OM
8P7M24″x 192″ Heavy Duty Plain Grinding Machine—Model OM
8P8M28″x 192″ Heavy Duty Plain Grinding Machine—Model OM
3R6H20″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R7H24″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R8H28″x 96″ Heavy Duty Roll Grinding Machine—Model OK
3R6J20″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R7J24″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R8J28″x 120″ Heavy Duty Roll Grinding Machine—Model OK
3R6K20″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R7K24″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R8K28″x 144″ Heavy Duty Roll Grinding Machine—Model OK
3R6L20″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R7L24″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R8L28″x 168″ Heavy Duty Roll Grinding Machine—Model OK
3R6M20″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R7M24″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R8M28″x 192″ Heavy Duty Roll Grinding Machine—Model OK
3R6P20″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R7P24″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R8P28″x 216″ Heavy Duty Roll Grinding Machine—Model OK
3R6R20″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R7R24″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R8R28″x 240″ Heavy Duty Roll Grinding Machine—Model OK
3R6S20″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R7S24″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R8S28″x 264″ Heavy Duty Roll Grinding Machine—Model OK
3R6T20″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R7T24″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R8T28″x 288″ Heavy Duty Roll Grinding Machine—Model OK
3R6U20″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R7U24″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R8U28″x 312″ Heavy Duty Roll Grinding Machine—Model OK
3R6V20″x 336″ Heavy Duty Roll Grinding Machine—Model OK
3R7V24″x 336″ Heavy Duty Roll Grinding Machine—Model OK
3R8V28″x 336″ Heavy Duty Roll Grinding Machine—Model OK
4R5E16″x 48″ Roll Grinding Machine—Model OM
4R6E20″x 48″ Roll Grinding Machine—Model OM
4R7E24″x 48″ Roll Grinding Machine—Model OM
4R5F16″x 72″ Roll Grinding Machine—Model OM
4R6F20″x 72″ Roll Grinding Machine—Model OM
4R7F24″x 72″ Roll Grinding Machine—Model OM
4R5H16″x 96″ Roll Grinding Machine—Model OM
4R6H20″x 96″ Roll Grinding Machine—Model OM
4R7H24″x 96″ Roll Grinding Machine—Model OM
4R5J16″x 120″ Roll Grinding Machine—Model OM
4R6J20″x 120″ Roll Grinding Machine—Model OM
4R7J24″x 120″ Roll Grinding Machine—Model OM
4R5K16″x 144″ Roll Grinding Machine—Model OM
4R6K20″x 144″ Roll Grinding Machine—Model OM
4R7K24″x 144″ Roll Grinding Machine—Model OM
4R5L16″x 168″ Roll Grinding Machine—Model OM
4R6L20″x 168″ Roll Grinding Machine—Model OM
4R7L24″x 168″ Roll Grinding Machine—Model OM
4R5M16″x 192″ Roll Grinding Machine—Model OM
4R6M20″x 192″ Roll Grinding Machine—Model OM
4R7M24″x 192″ Roll Grinding Machine—Model OM
*1T1HNo. 1 Chucking Grinding Machine—Model ER
2T1HNo. 1 Micro-Centric Grinding Machine—Model OM
2T2HNo. 2 Micro-Centric Grinding Machine—Model OM
3T1HNo. 1 Chucking Grinding Machine—Model OM
3T2HNo. 2 Chucking Grinding Machine—Model OM
*1U3B12”x 24” Universal Self Contained Grinding Machine—Model EA
*1U3D12″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U4D14″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U5D16″x 36″ Universal Self Contained Grinding Machine—Model EA
*1U3E12″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U4E14″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U5E16″x 48″ Universal Self Contained Grinding Machine—Model EA
*1U3F12″x 72″ Universal Self Contained Grinding Machine—Model EA
*1U4F14″x 72″ Universal Self Contained Grinding Machine—Model EA
*1U5F16″x 72″ Universal Self Contained Grinding Machine—Model EA
2U3B12″x 24″ Universal Hydraulic Grinding Machine—Model ER
2U3D12″x 36″ Universal Hydraulic Grinding Machine—Model ER
2U3E12″x 48″ Universal Hydraulic Grinding Machine—Model ER
2U3F12″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U4B14″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U5B16″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U6B18″x 24″ Universal Hydraulic Grinding Machine—Model ER
3U4D14″x 36″ Universal Hydraulic Grinding Machine—M0del ER
3U5D16″x 36″ Universal Hydraulic Grinding Machine—Model ER
3U6D18″x 36″ Universal Hydraulic Grinding Machine—Model ER
3U4E14″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U5E16″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U6E18″x 48″ Universal Hydraulic Grinding Machine—Model ER
3U4F14″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U5F16″x 72″ Universal Hydraulic Grinding Machine—Model ER
3U6F18″x 7 2″ Universal Hydraulic Grinding Machine—Model ER
4U2B10″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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Machine ID’d: HARDINGE HC & HCT Chucker Metal Lathe Chucking Machines

We’ve had a couple readers ask us questions about Hardinge HC & HCT chucking machines and metal lathes. We recently made available some more manuals for these Hardinge chucking machines. We have Hardinge operator’s, maintenance, and parts manuals for many different vintages, and for the different manual and automatic threading units that were on some of these Hardinge lathes. The Hardinge chucker lathes were workhorses, and even a worn out Hardinge HC & HCT can easily hold tight tolerances. These also had the nickname Kodak Lathe, which is explained below.

 

Hardinge Brothers, Inc. History

Hardinge Cataract lathe

1919 Hardinge Cataract Quick Change Lathe

The American Hardinge Brothers’ origins go back to 1890 in Chicago, when Franklin and Henry Hardinge began developing watchmaker lathes. They purchased the Cataract machine line from Cataract Tool and Optical Co, in 1902. In 1931 Morrison Machine Products purchased Hardinge Brothers and moved them to Morrison’s operations in Elmira, NY. Hardinge Brothers, Inc. machines are well known for their superb quality and dependability. Their popular models are the HLV and the great HLV-H precision lathes. The HC and HCT chucking machines came after WWII. These models were also know as Kodak lathes, because Kodak wanted machines to help in the manufacturing of high quality lens rings, casing, and shells. The engineers from Eastman Kodak Company actually went down to Elmira, NY to work with the engineers at Hardinge to develop these lathes specifically to help with Kodak’s production. That was the original purpose of these lathes, but these lathes also turned out to be great on other jobs as well.

 

Hardinge HCT Lathe Pictures

We received several pictures from some readers looking for information and manuals for their HCT chucker metal lathes. The first set show a HCT with serial #26300, dated 1953. The cross slide was removed for repair and cleaning, and it is missing the threading attachment, which is the “T” in HCT.

 

Hardinge HCT Automatic Threader

Threading attachment shown above

hardinge hct chucker01

Click pictures to enlarge

Hardinge HCT chucker02

This next set of pictures is of a Hardinge HCT chucking metal lathe. I’m not sure what the serial number is, but it is the same vintage of HCT lathe as the one above. Obviously, someone has added a VFD at the top left for variable speed control later, and this one is also missing the threading attachment.

 

hardinge hct chucking lathe 01 hardinge hct chucking lathe 04 hardinge hct chucking lathe 05hardinge hct chucking lathe 03hardinge hct chucking lathe 02

 

Hardinge Manual & Automatic Threading Unit Attachment

hardinge-automatic-manual-threading-unit

Hardinge made both a manual and automatic threading unit attachment for the chucker lathes, which were the HCT models. The Hardinge chucker lathes don’t have a quick change gearbox to switch feeds for different threads. Instead the Hardinge have a threading attachment unit that follows what is called a lead screw with a certain pitch that is placed on the back end of the spindle.

 

hardingeleadscrew

Lead Screw

Then you have to place the corresponding follower on the follower arm. This follows the lead screw which with the set pitch, and moves the tooling on the other side of the spindle so you can cut the threads. The following pitches for right-handed threads were standard: 12, 13, 14, 16, 18, 20, 24, 28, 32, 36, 40, 48, 50 and 60. Left-handed or special pitches could be custom ordered, and blank lead screws and followers were also sold so you could grind your own threads or leads.

 

hctthreading

Follower and Follower Arm

 

 

Hardinge Lathe Catalog Information

Below are some excerpts from some Hardinge lathe catalogs about the HC and HC-AT that detail the specifications of these lathes. We also have Hardinge catalogs and bulletins in PDF format free to download here: Hardinge PDF Downloads

 

1950

1976

 

Operator’s, Maintenance, and Parts Manuals for Hardinge HC, HCT, and HC-AT

 

We have quite a few manuals available that cover the Hardinge HC, HCT, and HC-AT lathes. Here are some Hardinge manuals that would be useful for these models:

HARDINGE HC & HCT Chucking Machine Lathes Operator’s Manual

HARDINGE HC & HCT Chucking Lathe Maintenance Manual

HARDINGE HC & HCT Chucking Lathe Parts Manual

HARDINGE HC Automatic & Manual Threading Unit’s Operator’s Manual ’57

HARDINGE Automatic Threading Unit on Model HC-AT Chucking Machine Operator’s Manual

HARDINGE Automatic Threading Unit on HC Chucking Machine Maintenance Manual

 

 

Do you have a HC or HCT that you would like to share pictures or information about?

Please contact us or leave some comments below.