Latch bolt operated by lever from either side except when outside lever is locked from outside by key. When outside lever is locked, latch bolt retracted by key, or by operating key and outside lever from outside or by operating inside lever. Auxiliary dead latch. The Commercial Mortise Lock delivers a high level of security and durability for demanding door applications where safety, compliance, and long-term performance are essential. Engineered to meet ANSI/BHMA A156.13-2005 Grade 1 standards and certified with UL fire rating, this lockset supports reliable operation in commercial environments such as office buildings, public facilities, and large-scale projects. The internal lockcase uses heavy gauge stainless steel to ensure strong resistance against corrosion and repeated use, maintaining stable functionality over time. With compatibility for both left-hand and right-hand doors and a standard fit for door thickness ranging from 45mm to 55mm, this lockset supports flexible installation across various commercial door systems. Precision manufacturing ensures accurate alignment, reducing installation errors and improving overall efficiency in project deployment.