The HD J Blank Key is typically refers to a key blank made by HD (Henry Squire / Davenport Burgess) or compatible with a "J" series/profile lock. 

Because "J" is used across several distinct lock types, the exact blank depends on your application:

Cylinder & SFIC Locks (Commercial): Refers to the Best "J" Keyway 7-pin interchangeable core, which cross-references to HD SS146 equivalent to JMA BES-8D and Silca BES9.

 

Automotive & Utility Locks: Refers to the HD J-Series for petrol caps and older vehicle/garage doors, or the HD P1098J for General Motors (GM) vehicles.

Information and illustrations are to the best of our knowledge and sourced from various sources. 

If you know differently, you are welcome to message us.