The B Series medium-duty lever lock offers tough, reliable performance and is ideal for new construction projects in retail, industrial, multi-family, government and military applications. It is a certified ANSI/BHMA A156.2 Series 4000 Grade 2 lock and exceeds the standard for durability and reliability. It is UL listed for 3-hour fire door, A label and meets ADA standards. In retrofit situations, the B Series offers interchangeable cores for quick and convenient re-keying and is compatible with cores built by other manufacturers. Lever trim has individual heavy-duty springs for lever return and to prevent lever sag. Trim is through-bolted with screws coated with thread sealant to provide strength and prevent the lock from loosening. Does not require field disassembly for re-handing, allowing for easy installation and maintenance.