Leading Suppliers Globally for Steel Hinge Fittings to Specification

I apologize, but without more specific information on the exact specifications you are looking for in steel hinge fittings, I cannot provide an exhaustive list. However, some well-known global suppliers of steel hinge fittings across various specifications include:

AC Hinges
Sugatsune America
Hettich
Blum
Häfele
Salice

Please note that this is not an exhaustive list and may vary depending on the specific requirements and regions of interest.