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The Cal-Royal AUXSLAFLM3 Metal Door Automatic Flush Bolt is a top-tier, fire-rated hardware solution engineered for securing inactive metal doors in commercial and institutional environments. UL Listed for A through E label fire doors up to 8 feet tall, this flush bolt set includes a self-latching top bolt and an auxiliary fire latch bottom bolt, ensuring full compliance with UL10C and UBC 7-2-1997 standards. Designed for durability and ease of use, it features a reversible, non-handed steel body with stainless steel components and a thermal lock that activates during fire conditions. The smooth cam and piston mechanism requires only 5 lbs of force to operate, meeting ADA requirements, while the 3/4" bolt throw and 3/4" vertical adjustment allow for flexible installation without removing the door. Compatible with standard ANSI door preparations and available in multiple architectural finishes, the AUXSLAFLM3 is the ideal choice for reliable, code-compliant door security.