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FB51P TOP AND BOTTOM BOLTS (PAIR), FB51T TOP BOLT ONLY
- For use with metal doors only
- Constant latching—inactive door remains latched until the active door is opened, releasing the automatic bottom bolt and then the top bolt can be manually released. Inactive door will relatch automatically when closed
- Low actuation forces
- Non-handed
- Bolt throw is 3/4" with a 7/8" vertical adjustment
- Bolt backset is 3/4"
- Standard rod length is 12", which is measured from the center of the flush bolt body to the bolt tip.
IVES FLUSH BOLTS OVERVIEW
Ives offers many accessories to ensure that a door is hung, protected and secured. Flush bolts can be used on doors that need to be secured without having a mullion or wall for latching. Flush bolts are usually used on a pair of double doors, like a large closet in a commercial building or French doors.These doors may have a lock, but the flush bolts allow one door to be anchored to the top of the door and the floor. The other door can then latch to the anchored door and keep the opening secure when not in use.
There are many types of flush bolts to accommodate various doors types, sizes and application needs while also matching existing or new door hardware. Flush bolts are recessed into the top and bottom of the door edge and slide upward or downward into the jamb or threshold to keep the door secure and closed.
FEATURES AND BENEFITS
- Available in both automatic and manual styles
- Designs for both hollow metal and wood door applications
- Variety of bolt throw lengths and bolt diameters to meet many application needs
- Flush bolts are non-handed for easy installation
- Meet ANSI/BHMA A156.3
- UL Listed for fire door applications
DESIGNS & FINISHES
Designs
Flush bolts provide a secure opening by latching the inactive door. Designs include the offerings below. For more specific models within each offering, see the Ives Full Line catalog.
- Automatic flush bolt: Fully automatic flush bolts ensure the inactive door is latched and bolts are extended when the active door closes. The inactive door is unlatched and the bolts retract when the active door is opened.
- Constant latching flush bolt: Constant latching flush bolts ensure the inactive door remains latched until the active door is opened, releasing the automatic bottom bolt and then the top bolt can be manually released. The inactive door will re-latch automatically when the door closes.
- Manual flush bolt: Manual flush bolts must be extended and retracted manually, depending on when the inactive leaf needs to be secured or opened.
Finishes
- Flush bolts come in many BHMA standard finishes
- Custom finishes are available as an engineering special; consult Customer Service
- Please refer to the Ives Full Line catalog for finishes offered on specific product series
RESOURCES & DOWNLOADS
Manufacturer Resources
Product Specs
- Subcategory:
- Flush Bolts and Coordinators
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Flush Bolts
- Product Type:
- Flush Bolts
- ANSI/BHMA:
- ANSI A156.3 Type 27
- Commercial/Residential:
- Commercial
- UL Listing Type:
- UL Listed 3 Hours
- Product Model:
- FB51P/FB51T
- Door Hand Direction:
- Non-Handed
- Product Dimension:
- W: 1", L: 6-3/4", D: 2"
- Fire Rating:
- Yes
- Door Strike:
- W: 15/16", L: 2-1/4", D: 1/16"
- Product Category:
- Door Trim and Accessories
Ives FB51P 12 MD US32D – Frequently Asked Questions
1) What is the Ives FB51 top and automatic bottom bolt used for?
The FB51 provides dual-point locking for doors requiring enhanced security. The top bolt operates manually while the bottom bolt engages automatically when the door closes. Common applications include exit doors, stairwell doors, and high-security commercial entrances.
2) What door types and thicknesses work with this bolt system?
The FB51 fits standard commercial doors typically 1-3/4" thick. Compatible with wood, steel, and aluminum doors. Verify door preparation requirements match your door type. Check manufacturer specifications for exact thickness ranges and edge requirements.
3) Can this be installed on left-hand or right-hand doors?
Specify door handing when ordering. The FB51 is handed and must match your door swing direction. Measure door swing from the hinge side to determine correct handing. Non-handed installation will cause operational issues.
4) What finish options are available for the FB51?
Standard finishes include satin chrome, bright brass, and oil-rubbed bronze. Special finishes may be available on request. Choose finish to match existing door hardware for consistent appearance. Verify finish availability before ordering.
5) What is the holding strength of this bolt system?
Ives commercial-grade bolts provide substantial holding force when properly installed. Exact force ratings depend on door preparation and frame conditions. Consult manufacturer specifications for precise load ratings. Professional installation ensures maximum strength.
6) Does this bolt meet building code requirements?
The FB51 is designed for commercial applications but code compliance depends on specific use and local requirements. Egress doors may have special regulations. Verify with local building officials for life safety applications. Some locations restrict automatic locking mechanisms.
7) What parts are included with the FB51 system?
Complete system includes top bolt assembly, automatic bottom bolt, mounting hardware, and strike plates. Installation template provided. Verify all components before installation. Replacement parts available separately through Ives parts program.
8) What door preparation is required for installation?
Requires mortising door edge and boring holes per template. Frame preparation needed for strike plates top and bottom. Use provided template for accurate positioning. Professional installation recommended for proper alignment and operation.
9) How do you adjust the automatic bottom bolt?
Bottom bolt timing adjusts via internal mechanism. Spring tension controls engagement speed. Follow manufacturer adjustment procedures. Over-adjustment can cause premature wear. Test operation after any adjustments to ensure proper function.
10) Are there similar Ives models for different applications?
Ives offers various bolt configurations including manual-only versions and different throw lengths. The FB series includes multiple models for specific door types. Browse our complete Ives hardware selection for alternative solutions.
11) What maintenance does this bolt system require?
Periodic lubrication of moving parts maintains smooth operation. Clean bolt channels of debris. Check strike alignment if binding occurs. Inspect mounting screws for looseness. Schedule regular maintenance in high-use applications to prevent operational issues.
12) How do you measure for proper bolt extension?
Measure door-to-frame gap and frame depth to determine required throw length. Standard residential gaps differ from commercial applications. Account for weather stripping and door sag. Insufficient throw reduces security while excessive throw causes binding.
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Does the Ives FB51P 12 MD US32D come with a warranty?
Absolutely. The Ives FB51P 12 MD US32D is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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