The 557 x 19BFB Lever Extension Flush Bolt with Bottom Fire Bolt is for use on select fire rated plastic & wood covered fire doors. This product maintains the doors strength and features a bottom fire bolt that eliminates the need for floor prep and an oversized fire bolt strike hole that allows for slight door misalignment. When the door is subjected to 230˚F the plug and black plastic cover will melt allowing the bolt to project, locking the leaves together.
Product Overview
- 3/4" backset
- Door strength maintained by corner reinforcing plate
- When door is subjected to 230˚F, plug and black plastic cover melt allowing bolt to project, locking leaves together
- Flush Bolt Rods cannot be extended
Specifications
- Base Material: Brass, Stainless steel
- Fastener: 7 ea. #8 x 3/4" FH combo screws 4 ea. #8 - 32 x 1/2" FH MS 4 ea. #8 counter sunk washer
- Weight: 0.9lbs.
- Bottom Bolt Diameter: 13/16"
- Bolt Throw: 3/4"