Ives FB51 Constant Latching Fl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$305.60
$158.21
Ives FB51P Constant Latching Flush Bolt Pair for Metal Doors, 12" Rod, 630 Satin Stainless Steel - top and bottom bolts shown with rods extended

Ives FB51 Constant Latching Flush Bolts for Metal Doors with 12" Rod Length

(1 review) Write a Review

Model: FB51P 12 MD US32D
Selected Finish is
Selected Model is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$305.60
$158.21
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Ives FB51 Constant Latching Flush Bolts for Metal Doors with 12" Rod Length

Professional Constant Latching Solution for Double Door Applications

The Ives FB51 Constant Latching Flush Bolts provide secure anchoring for metal door pairs with innovative constant latching operation. Designed specifically for metal doors, these flush bolts feature a 12" standard rod length measured from the center of the flush bolt body to the bolt tip, with 3/4" bolt throw and 7/8" vertical adjustment capability. The constant latching mechanism ensures the inactive door remains latched until the active door is opened, providing automatic security with low actuation forces and non-handed installation flexibility.

Professional Features & Benefits

  • Constant Latching Operation: Inactive door remains latched until active door is opened, releasing automatic bottom bolt while top bolt can be manually released for enhanced security control.
  • Metal Door Compatibility: Engineered specifically for use with metal doors only, ensuring proper fit and reliable operation in commercial applications.
  • Precision Bolt Specifications: 3/4" bolt throw with 7/8" vertical adjustment and 3/4" bolt backset for versatile installation requirements.
  • Standard Rod Length: 12" rod length measured from center of flush bolt body to bolt tip accommodates standard door configurations.
  • Low Actuation Forces: Designed for smooth operation with minimal effort required for manual bolt release when needed.
  • Non-Handed Design: Universal installation eliminates handing concerns and simplifies inventory management for contractors.
  • Fire Door Compliance: UL Listed for 3-hour fire door applications meeting critical life safety requirements.
  • ANSI/BHMA Certification: Meets ANSI A156.3 Type 27 standards for commercial-grade performance and reliability.

Technical Specifications

  • ANSI/BHMA: ANSI A156.3 Type 27
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Hand Direction: Non-Handed
  • Door Strike: W: 15/16", L: 2-1/4", D: 1/16"
  • Fire Rating: Yes
  • Product Category: Door Trim and Accessories
  • Product Dimension: W: 1", L: 6-3/4", D: 2"
  • Product Group: Door Trim and Accessories
  • Product Model: FB51P/FB51T
  • Product Subgroup: Flush Bolts
  • Product Type: Flush Bolts
  • Subcategory: Flush Bolts and Coordinators
  • UL Listing Type: UL Listed 3 Hours

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Ives Quality?

Ives FB51 flush bolts deliver professional-grade reliability with precision-engineered constant latching mechanisms designed for demanding commercial applications. UL Listed for 3-hour fire door applications and certified to ANSI/BHMA A156.3 Type 27 standards, these flush bolts provide dependable security performance where reliable door anchoring is essential. Engineered for demanding commercial applications where dependable performance is essential.

Manufacturer Resources

Ives Full Line Catalog

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:
UL Listed 3 Hours
Door Strike:
W: 15/16", L: 2-1/4", D: 1/16"
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Ives FB51P 12 MD US32D – Frequently Asked Questions

1) What does constant latching mean on the Ives FB51, and how is it different from a manual flush bolt?
With constant latching, the inactive leaf stays latched on its own until the active door is opened. Opening the active door releases the bottom bolt automatically, and the top bolt can be released by hand. A manual flush bolt, like the ABH 1855S single or the Trimco 3999 corner mount, has to be thrown and released by hand every time. Pick constant latching when you want the inactive leaf secured without relying on someone to remember to throw it.
2) Do I need to order left hand or right hand FB51 flush bolts?
Neither. The FB51 is non-handed, so the same part goes in either leaf of the pair. For a property manager stocking spares across a building, that means one part number covers every metal door pair regardless of swing.
3) What is the difference between ordering FB51P and FB51T?
FB51P is the pair, top and bottom bolts together, for a full two-point installation on the inactive leaf. FB51T is the top bolt alone. Order the T when the bottom of the opening is already handled, for example by an existing bottom bolt or a floor-mounted device, and you only need to replace or add the head bolt. Both come in the same 12 inch rod, metal door configuration.
4) The door pair is wood, not metal - what flush bolt should be used instead of the Ives FB51?
The Ives FB51 is engineered for metal doors only, so a wood pair needs a different bolt. The Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors. Delaney also offers wood-door style mortise flush bolts, including a 7 inch slide type mortise-in flush bolt and a 6 inch square end solid brass flush bolt. Confirm the leaf construction before ordering; a metal-door bolt body will not prep correctly into a wood stile.
5) What is the closest equivalent to the Ives FB51 flush bolt from another manufacturer for a fire-rated metal door pair?
The ABH 1860P/1862P automatic flush bolt pair is the nearest peer for a fire-rated metal door pair. It is an automatic flush bolt pair rated 3-hour fire with a thermal lock, while the Ives FB51 is a constant latching flush bolt for metal doors, UL Listed 3 hours and certified to ANSI A156.3 Type 27. Both keep the inactive leaf anchored without a manual throw on every cycle: the FB51 holds the inactive door latched until the active door is opened, releasing the bottom bolt automatically. The FB51 is non-handed and comes as FB51P for the top and bottom pair or FB51T for the top bolt alone.
6) If the inactive leaf does not need to release automatically, what is a simpler flush bolt than the Ives FB51?
A manual flush bolt is the simpler route. The ABH 1854 Series is a manual flush bolt set with a fire bolt for metal doors, and the ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw - the same 3/4 inch bolt throw the Ives FB51 carries. With a manual bolt, someone throws and retracts the bolt by hand at the door; the FB51 constant latching mechanism keeps the inactive door latched until the active door is opened. Choose manual where the inactive leaf stays fixed most of the time and automatic latching where it is cycled.
7) What should a locksmith use instead of the Ives FB51 when the inactive leaf has to be key controlled?
The Ives FB51 is operated by its constant latching mechanism and manual release at the top bolt, with no cylinder in the assembly. Where the inactive leaf must be released by key, the Adams Rite 1870 Series is a cylinder-operated flushbolt with key control, and the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors. A cylinder-operated flushbolt brings the inactive leaf into the keying schedule; the FB51 does not, so its release stays with whoever is at the door.
8) Only the bottom bolt on a fire-rated metal pair needs replacing - what works besides ordering an Ives FB51 pair?
The Ives FB51 is sold as FB51P for top and bottom bolts as a pair or FB51T for the top bolt only, so there is no bottom-only Ives part in the FB51 line. For a bottom position on its own, the ABH 1858 is a universal bottom fire bolt with manual operation. Note the operating difference: the FB51 bottom bolt releases automatically when the active door opens, while the ABH 1858 is manual, so mixing them changes how the inactive leaf behaves on the bottom.
9) How much room does the FB51 flush bolt body need in the door edge?
The bolt body measures W: 1 inch, L: 6-3/4 inch, D: 2 inch, and the rod runs 12 inches measured from the center of the body to the bolt tip. Mortise the edge of the metal leaf to take that body, then run the rod to the head or the sill. On a standard height opening the 12 inch rod is the usual length; taller leaves need a longer rod.
10) Is a constant latching flush bolt or an automatic flush bolt the right choice for a fire rated metal pair?
Both keep the inactive leaf secured without hand operation, but they behave differently. The FB51 keeps the inactive leaf latched at all times and drops the bottom bolt when the active door opens, with the top bolt released by hand. An automatic flush bolt like the ABH 1860P/1862P pair releases when the active leaf closes against it and is fire rated to 3 hours with a thermal lock. If the inactive leaf gets used regularly, the automatic set is the easier daily operation; if you want the inactive leaf to stay secured, the FB51 is the one.
11) I need a flush bolt on a metal pair that only authorized staff can release. Is the FB51 it?
No. The FB51 releases by hand with no key control. For key-controlled operation on a pair, the Adams Rite 1870 Series is a cylinder-operated flushbolt with key control, and the Adams Rite MS2180 Series is an auto-release two-point flushbolt. Those are what to specify when the release has to be restricted.
12) Is the Ives FB51 rated for commercial use or is it a residential flush bolt?
Commercial. It is certified to ANSI/BHMA A156.3 Type 27 and UL Listed for 3 hours, which is the spec level an institutional or MRO buyer needs on office, healthcare, education, and municipal openings. Lighter decorative flush bolts, like the Emtek or Delaney solid brass units, are made for a different duty level and do not carry that certification in our record.
13) I have an ABH 1854 flush bolt set on a metal pair. Can I swap in the Ives FB51?
Both the ABH 1854 Series set and the FB51 are made for metal doors, but they are not a stated drop-in for each other. What you can check is the prep: the FB51 body is W: 1 inch, L: 6-3/4 inch, D: 2 inch with a 3/4 inch throw and 3/4 inch backset, and 7/8 inch of vertical rod adjustment. If your existing mortise and strike match those numbers the changeover is straightforward, otherwise plan on new door edge prep. Note the FB51 is constant latching, not manual, so the operation on the inactive leaf will change.
14) Is the International Door Closers FB-1202 a drop-in substitute for the Ives FB51?
No. The FB-1202 is a flush bolt with a positive U joint actuator, 5/8 inch throw, 1/8 inch offset with a 7/8 inch backset and a square end with guide. The Ives FB51 uses a 3/4 inch bolt throw with a 3/4 inch bolt backset and 7/8 inch vertical adjustment. Different throw and different backset mean different strike engagement and a different door prep, so it is a like-for-like swap only if the opening is being prepped fresh to the FB-1202 dimensions.
15) What is the difference between the Ives FB51 and a two-point flushbolt like the Adams Rite MS1880 or MS2180?
The Adams Rite MS1880/MS1881 are two-point flushbolts with an interlock mechanism, and the MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism - a two-point unit throws top and bottom from a single point of operation. The Ives FB51 is a constant latching flush bolt supplied as separate top and bottom bolts in the FB51P pair, or as the FB51T top bolt alone, non-handed, for metal doors. If the specification calls for single-point two-bolt actuation, the two-point units answer it; the FB51 answers a constant latching requirement on a metal pair.
16) What finishes do Ives FB51 flush bolts come in?
Seven finishes, in both the FB51P pair and the FB51T top-only: 605 bright brass, 606 satin brass, 612 satin bronze, 613 satin bronze oil-rubbed, 622 matte black, 629 bright stainless steel, and 630 satin stainless steel. For matching existing commercial openings, 630 satin stainless is the one that lines up with most commercial lever and exit device hardware already in the building.
17) How hard is the FB51 to operate for a tenant or a housekeeping crew?
It is built for low actuation forces, so throwing and releasing the bolt takes minimal effort. The bottom bolt releases on its own when the active leaf opens, so on a day to day basis nobody has to reach down to the floor to free the inactive leaf.
18) For a residential or decorative double door, is there an alternative to the Ives FB51 flush bolt?
Yes. The Ives FB51 is a commercial flush bolt built for metal doors and carries a UL 3 hour listing, which is more device than a decorative interior pair usually calls for. Emtek offers flush bolts, and Orca Hardware offers a 6 inch flush bolt with radius corners for a softer edge profile. Delaney's 6 inch square end solid brass flush bolt is another decorative option. Reserve the FB51 for rated and high-traffic commercial metal openings.
19) The existing bolt prep sits deeper in the stile than the Ives FB51 rod reaches - what is the alternative?
When the prep runs deeper than a standard rod, an extension-style mortise bolt covers it: the Delaney 7 inch mortise extension in flush bolt is built for that longer reach, as is the Delaney 7 inch slide type mortise in flush bolt. The Ives FB51 covered here uses a 12 inch rod measured from the center of the flush bolt body to the bolt tip with 7/8 inch of vertical adjustment, so measure the existing prep from bolt body center to bolt tip before deciding whether the adjustment range absorbs the difference.
How fast can I get the Ives FB51P 12 MD US32D delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
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.
How do I get technical support or installation help for the Ives FB51P 12 MD US32D?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Ives FB51P 12 MD US32D from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

Product Reviews

  • 5
    Keeping It Secure: My Thoughts on the Ives FB51 Bolt

    Posted by Chase on Aug 22nd 2023

    I recently got my hands on the Ives FB51 Top and Automatic Bottom Bolt from zensupply.com, and it's doing its job well. The automatic feature is a lifesaver for busy days when I forget to lock up properly. Plus, the installation was a breeze, even for a not-so-handy person like me. However, it's a bit more visible on the door than I'd like. All in all, a solid addition to my security setup.

!