(106) Sargent 41 mortise cylinder and 4820 auxiliary deadbolt: pick and gut
Channel: Nite 0wl
Date: 2018-08-07

The Sargent 4820 is a now discontinued 'auxiliary' mortise deadbolt, its successor is the 4874 which uses a stamped steel case instead of the older cast iron body and now uses a laminated steel bolt instead of the cast and plated bolt. These locks are most commonly found in schools and hospitals, often in service and equipment closets. The 4800 series is less than half the size of the 8200 series deadbolt which uses a 'standard' size mortise case. Double cylinder deadbolts are now restricted in most building and fire codes due to life safety concerns, in most cases if they are only allowed to be used if there are alternative exit doors in the same room equipped with thumb-turns on the inside, where needed mortice thumb-turn cylinders are available to quickly retrofit these locks. Like other locks of this vintage repairs are very simple and there is a minimum of parts, generally the only part that will break down is the lever spring which can often be re-formed or replaced using flat spring stock.

The 40 series is Sargent's basic commercial grade mortise cylinder, drilled for 6 pins and usually fitted with Sargent's vertical or offset cam. It has no special drill or picking protections and comes from the factory with only standard pins unless special options are ordered. This cylinder was factory standard.