YaleYale Locks, Exit Devices and Trim, Door Closers, Auxiliary Locks. Cylindrial Lever Locks 5400LN Series And 4600LN Are Ideal For Institutions, The Yale 7100 And 6000 Series Exit Devices Are Made To Last ! Yales 3000 and 4400 Series Door Closers are Available For a Variety Of Mounting Applications to Fit Your Needs. Mr Linus Yale Jr. transformed the locking industry forever when he created his most important invention: the Yale pin tumbler cylinder. Now, over 170 years later, Yale's comprehensive line of door hardware includes mortise and cylindrical locks, exit devices, door closers, access control products and key systems.