Key Bitting Specifications

Key Bitting Specifications 2018-09-21T08:14:46+00:00

Project Description

A key bitting specification can be used to determine quite a lot from a key and/or cylinder. Measurements with a precise caliper or micrometer can reveal the proper pinning, the keying system, applicable key blank(s), increment size, and many other characteristics that are valuable to locksmiths in the field or in the shop. You are only limited by your imagination with ways to utilize and “translate” the information from these key bitting specifications for your benefit.  

Each key bitting specification contained on this page will contain the following information:

  • Spacing
  • Root Depths
  • MACS (if applicable)
  • Included Angle
  • Root Cut

When available, other information such as effective plug diameter, increment size, progression type, and corresponding pins/wafers will also be included. All key bitting specifications are listed by manufacturer and labelled according to industry accepted nomenclature, such as Best A2 or A4, or increment size, such as Yale .025″ and Yale .018″. Additionally, special information related to the key bitting specification can be found in the “Notes” box. 

Information related to various key code equipment can be found in the “Key Origination” box. The “Blackhawk” box will refer you to the corresponding Blackhawk code card. The “CodeMax” block will refer you to the corresponding HPC DSD number. The “HPC Blitz” box will refer you to the corresponding HPC code card. If manufactured, the “HPC Punch” box will refer you to the corresponding HPC 1200PCH card. Finally, the “ITL” box will refer you to the corresponding ITL 9700 number. 

Note: Assembling a comprehensive list for key bitting specifications is a very tedious and laborious process. Information for most key bitting specifications is readily available but some information has been lost to time, manufacturer mergers or closings, and/or product discontinuation. Every effort to compile these key bitting specifications started with information sourced directly from the manufacturer. In instances where this was not possible, information was drawn from aftermarket code equipment manufacturers, such as HPC’s DSD list or ITL’s Operations Manual, and code books.  Every effort was made to meticulously scrutinize and “double-check” all key bitting specifications for accuracy. With that said, we are human. If you find a discrepancy please contact us.

High Security

Corbin Russwin Access 3 (AP)

Corbin Russwin Access 3 (AS & AHS)

Corbin Russwin Pyramid

Medeco Biaxial

Medeco Original – Full Step

Medeco3 (M3)

Medeco X4

Sargent Degree (DG1)

Sargent Degree (DG2 & DG3)

Pin Tumbler

American Lock/Junkunc Brothers Small Pin

Arrow New Large Pin




Corbin Russwin Z and DH Class (System 70)

Corbin X Class (Pre-System 70)

Corbin X Class (System 70)

Corbin Z Class (Pre-System 70)

Dexter (1969+)

Dexter (Pre-1969)

Hager H Series

Kaba Peaks 140 Family A2

Kaba Peaks 140 Family A4

Kaba Peaks 150 Family A2

Kaba Peaks 150 Family A4

Kwikset .023″

Kwikset Titan

Lockwood Large Pin, Standard

Master Lock Pro Series

Old Russwin 752 Class

Old Russwin 852 Class

Old Russwin A Class

Russwin 981 Class

Russwin DH Class (Pre-System 70)

Russwin N Class (Pre-System 70)

Russwin N Class (System 70)

Sargent .020″

Sargent Signature

Schlage Classic


Yale .019″

Yale .025″


Chicago Disc Tumbler

National Disc Tumbler (Single Sided)

Schlage Wafer