For over fifty years MAINA has been manufacturing gear couplings of all types and dimensions. They are divided into the following types:
- standard couplings type GO A
- big-sized couplings type GO B
- couplings for special applications type G20, G35 and G60
- gear couplings for hoist barrels type GTS

Any technical and dimensional information necessary for the selection and the use, maintenance and lubrication of the couplings is contained in MAINA catalogue 270/C