The Rockwood 557 Lever Extension Flush Bolt delivers dependable performance for fire-rated plastic and wood-covered doors. In addition, its cast brass construction provides long-lasting strength while maintaining the door’s integrity through a built-in corner reinforcing plate.

Moreover, this flush bolt supports fire-rated openings up to 4 feet wide by 10 feet high, with ratings up to 1-1/2 hours. As a result, it offers both safety compliance and smooth operation in commercial and residential applications.

Product Features:

• Designed for fire-rated plastic and wood-covered doors (up to 1-1/2 hours)
• 3/4″ backset with 3/4″ bolt throw
• Maintains door strength with corner reinforcing plate
• Compatible with #570 Dust Proof Strike to prevent debris from blocking the bottom strike
• Flush bolt rods cannot be extended
• Optional Torx security screws available

Specifications:

• Base Material: Cast Brass
• Fasteners: (7) #8 x 3/4″ flat head combo screws, (4) #8-32 x 1/2″ flat head machine screws, (4) #8 countersunk washers
• Weight: 0.85 lbs
• Bolt Throw: 3/4″
• Faceplate Size: 1″ W x 6-3/4″ L
• Strike Size: 15/16″ W x 2-1/4″ H

Overall, the Rockwood 557 Flush Bolt combines fire-rated compliance, reinforced strength, and smooth operation. Therefore, it is an ideal choice for wood and plastic-covered door applications where safety and durability matter most.