You are here: Products / Mechanical Locks / Marine Locks / Lock case 5312/8/5390 Lock case 5312/8/5390 Lock case 5312/8/5390 Lock case 5312/8/5390 Surface mounted cylinder lock case for heavy-duty doors. Lock case 5312/8/5390 meets all fire class requirements.It is surface mounted and is suitable for corrosive environments and heavy, steel doors. Downloads 53-Series - Application Table (.pdf, 140 kB) 53-Series - Dimensions and Drilling (.pdf, 286 kB) Lock case 5312/8/5390 - Information page (.pdf, 100 kB) Close Want to know more about our innovative technology? Click here to contact a local distributor! Lock case 5316/8 BathroomBathroom Door Lock case Lock case 5341/8Cylinder Lock case with dead bolt Lock case 5312/8Cylinder Lock case for heavy-duty doors