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The Cal-Royal UNIFB540 Metal & Wood Door Universal Flush Bolts offer a versatile and fire-rated solution for securing inactive doors in both metal and wood applications. This flush bolt set includes an automatic flush bolt for the top and a fire latch bolt for the bottom, ensuring reliable performance and enhanced safety. UL Listed for metal and wood composite core fire doors up to 8 feet in height, the UNIFB540 conforms to UL10C and UBC 7-2-1997 standards. Its fully automatic operation retracts bolts when the active door opens and secures them when closed, while the override feature prevents damage from misalignment. With a reversible, non-handed design, 5/8″ vertical adjustment, and compatibility with standard ANSI door preparations, this flush bolt set is ideal for commercial and institutional use seeking dependable, code-compliant door hardware.

• UL Listed for (A, B, C, D and E Label) metal fire doors, maximum 8 in height. Conforms to UL10C and UBC 7-2-1997.
• UL Listed for ( B, C, D and E Label) wood composite core fire doors, maximum 8 in height. Conforms to UL10C and UBC 7-2-1997.
• Fits standard and ANSI preparation for wood doors.
• Fits standard and ANSI preparation for metal doors.
• Override feature, prevents damage to doors of frame in case the strike and bolt are not aligned.
• Reversible, non-handed.
• Steel body with stainless steel components, especially designed thermal lock automatically locks inactive door in case of fire.
• Fully automatic, when active door is opened top and bottom bolts are automatically retracted for easy egress. When active door is closed34″ bolt projects into the frame, securing latching of inactive leaf.
• Bolts have58″ vertical adjustment without removing door from frame for unusual conditions.
• Available in Architectural Finishes. Packed 1 top bolt and 1 auxiliary fire latch per box with composite installation template. Used where a fire-rating application without a bottom bolt is required. The auxiliary fire latch, mounted in the door edge, releases under extremely high temperatures to keep the doors in alignment during a fire.