Ives FB52/FB53 Top Bolt with A...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$333.90
$214.89
IV_FB53_630_SL_square

Ives FB52/FB53 Top Bolt with Auxiliary Fire Latch - 3/4" Throw Non-Handed

(No reviews yet) Write a Review

Model: FB53 12 MD US32D
Selected Finish is

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

$333.90
$214.89
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 FB52/FB53 Top Bolt with Auxiliary Fire Latch - 3/4" Throw Non-Handed

Professional Constant Latching Flush Bolt Solution

The Ives FB52/FB53 Top Bolt with Auxiliary Fire Latch provides constant latching functionality for metal door applications where the inactive door remains latched until the active door is opened. This non-handed flush bolt features a 3/4" bolt throw with 7/8" vertical adjustment and 3/4" bolt backset, designed specifically for use with metal doors only. The FB52 model eliminates the bottom bolt with auxiliary fire latch, while the FB53 includes a retrofit plate to cover existing bottom bolt preparation.

Professional Features & Benefits

  • Precise Bolt Specifications: 3/4" bolt throw with 7/8" vertical adjustment and 3/4" bolt backset for reliable latching performance.
  • Constant Latching Operation: Inactive door remains latched until active door is opened, releasing automatic bottom bolt before top bolt can be manually released.
  • Fire-Rated Construction: UL Listed for 3-hour fire door applications meeting ANSI/BHMA A156.3 Type 27 standards.
  • Low Actuation Forces: Engineered for smooth operation with minimal effort required for manual release.
  • Non-Handed Design: Universal installation eliminates field determination requirements and reduces inventory needs.
  • Auxiliary Fire Latch: FB52 eliminates bottom bolt while FB53 includes retrofit plate to cover existing bottom bolt preparation.
  • Standard Rod Configuration: 12" standard rod length measured from center of flush bolt body to bolt for consistent installation.
  • Metal Door Compatibility: Specifically designed for hollow metal door applications in commercial environments.

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: FB52/FB53
  • 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 flush bolt products deliver professional-grade reliability with UL Listed 3-hour fire rating and ANSI/BHMA A156.3 Type 27 compliance for demanding commercial applications. The constant latching design with low actuation forces ensures dependable operation while meeting stringent fire door requirements. Engineered for demanding commercial applications where dependable performance and code compliance are 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:
FB52/FB53
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
Department:
Door Hardware

Ives FB53 12 MD US32D – Frequently Asked Questions

1) What is the difference between the Ives FB52 and the FB53?
Same top bolt, different treatment of the bottom of the door. The FB52 eliminates the bottom bolt with auxiliary fire latch and leaves it at that. The FB53 adds a retrofit plate that covers an existing bottom bolt preparation, so it's the one to order when you're pulling an old bottom flush bolt out of a door that's already routed and you don't want to look at the empty mortise.
2) Is the Ives FB52 flush bolt fire rated, and to what standard?
UL Listed for 3 hours, and it meets ANSI/BHMA A156.3 Type 27. That combination is what lets it go on a fire-rated pair where the inactive leaf has to stay latched, which is why it's specified in healthcare, education, and government work where the door schedule calls out a labeled opening.
3) How does a constant latching flush bolt operate differently from a standard manual one?
With the FB52/FB53, the inactive door stays latched until the active door is opened. You can't release the top bolt manually until the automatic bottom bolt has released first, so the inactive leaf can't be casually propped open the way a plain manual flush bolt allows. That sequencing is the point on a fire pair. If you want both leaves to release automatically instead, an automatic flush bolt pair like the ABH 1860P/1862P is the other approach; if you want a straight manual bolt you set and forget, the ABH 1855S single is that type.
4) Can I use a 6 inch flush bolt like the Trimco 3999 in place of the Ives FB52 on a fire pair?
Not as an equivalent. The Trimco 3999 and 3999SE are 6 inch corner mount flush bolts, and the Orca 86SQ is a 6 inch flush bolt with radius corners. None of them carries the auxiliary fire latch function the FB52/FB53 provides, and the FB52/FB53 is the one UL Listed 3 hours to ANSI A156.3 Type 27. On a labeled opening, substitute like for like.
5) What flush bolt should be used on a pair of wood doors instead of the Ives FB52?
The Ives FB52/FB53 top bolt with auxiliary fire latch is designed for hollow metal door applications. For paired wood doors, the Adams Rite 1877 is a cylinder-operated flushbolt built for that substrate. The Delaney 6 inch square end solid brass flush bolt and the Delaney 7 inch slide type mortise in flush bolt are further mortise-style options. Confirm the leaf material before ordering, because the FB52 and FB53 are specified for metal doors only.
6) What is the closest equivalent to the Ives FB52 top bolt with auxiliary fire latch from another manufacturer?
The ABH 1854 Series is a manual flush bolt set with fire bolt for metal doors, which is the same application as the Ives FB52 and FB53 top bolt with auxiliary fire latch for metal doors. Both are built for the inactive leaf of a fire-rated pair of hollow metal doors. The Ives FB52/FB53 carries a UL Listed 3 hour rating and meets ANSI A156.3 Type 27. The ABH 1854 is sold as a set with the fire bolt included, while the FB52 eliminates the bottom bolt with auxiliary fire latch and the FB53 adds a retrofit plate to cover an existing bottom bolt preparation.
7) If the pair of doors needs automatic flush bolts instead of a manual top bolt, what should be used?
The ABH 1860P/1862P is an automatic flush bolt pair, fire rated 3 hour with a thermal lock, and it retracts the bolt automatically when the active leaf closes rather than being released by hand. The Ives FB52/FB53 top bolt with auxiliary fire latch is a constant latching arrangement: the inactive door stays latched until the active door is opened, and the automatic bottom bolt releases before the top bolt can be released manually. Choose by how the opening is meant to operate, since both are rated for fire door use.
8) Do I have to specify left or right hand when ordering an Ives FB52 flush bolt?
No handing to call out. The FB52/FB53 top bolt is non-handed, so one part covers either leaf of a pair and you don't need to determine hand in the field or stock both versions. Useful if you're standardizing flush bolts across a building.
9) How far up the door does the Ives FB52 rod reach on a standard opening?
Standard rod length is 12 inches, measured from the center of the flush bolt body to the bolt, which is why the part numbers all read FB52 12 or FB53 12. The bolt body itself measures W 1 inch, L 6-3/4 inch, D 2 inch for the door mortise.
10) I need a flush bolt for a metal fire door pair but the FB52 isn't right. What else is there?
Among metal-door flush bolts, the ABH 1854 Series is a manual flush bolt set with a fire bolt, and the ABH 1860P/1862P is an automatic flush bolt pair rated 3-hour with a thermal lock. If you only need to replace the bottom fire bolt on an existing pair, the ABH 1858 is a universal bottom fire bolt, manual operation. Where key control on the inactive leaf is the requirement, the Adams Rite 1870 Series is cylinder-operated.
11) Does the Ives FB52 need a bottom bolt ordered separately to complete the pair?
No separate bottom bolt. The FB52 arrangement does away with the bottom bolt with auxiliary fire latch entirely, so the top bolt is what you install. Order the FB53 version if the door already has a bottom bolt mortise you need covered, since that one ships with the retrofit plate.
12) Is a 6 inch corner mount flushbolt like the Trimco 3999 a substitute for the Ives FB52 top bolt with auxiliary fire latch?
No. The Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end and the Trimco 3999SE is the 6 inch corner mount square end version; both are plain manual flushbolts mounted at the corner of the leaf. The Ives FB52/FB53 is a top bolt with auxiliary fire latch that provides constant latching, carries a UL Listed 3 hour rating, and meets ANSI A156.3 Type 27. A corner mount flushbolt is the right part for a non-rated pair, not a drop-in for a fire latch arrangement.
13) What flush bolt option gives key control over the inactive leaf rather than manual release?
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. Both are thrown and retracted by key rather than by hand. The Ives FB52/FB53 top bolt with auxiliary fire latch is a non-handed manual arrangement where the top bolt is released by hand after the automatic bottom bolt releases. Pick the cylinder-operated version where the facility wants the inactive leaf under key control.
14) What is the difference between the Ives FB52 top bolt and a single manual flush bolt such as the ABH 1855S?
The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, sold as one bolt. The Ives FB52 and FB53 also use a 3/4 inch bolt throw with 7/8 inch vertical adjustment and a 3/4 inch bolt backset, and add the auxiliary fire latch and constant latching operation, with the FB53 carrying a retrofit plate to cover existing bottom bolt preparation. Both are metal door parts; the difference is whether the fire latch function is part of the assembly.
15) What two-point flushbolt options exist for a pair that needs top and bottom secured from one device?
The Adams Rite MS1880/MS1881 are two-point flushbolts with an interlock mechanism and the Adams Rite MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism; each drives both the top and bottom bolt from a single unit. The Ives FB52/FB53 is a top bolt with auxiliary fire latch handling only the head of the inactive leaf, with the FB52 eliminating the bottom bolt and the FB53 covering an existing bottom bolt preparation with a retrofit plate.
16) When replacing an old bottom flush bolt that is being removed, which part covers the leftover door prep?
The Ives FB53 includes a retrofit plate to cover existing bottom bolt preparation, while the FB52 is the same top bolt with auxiliary fire latch without that plate. If the bottom prep is instead to be refilled with a working bolt, the ABH 1858 universal bottom fire bolt is a manual bottom fire bolt, and the Delaney 7 inch mortise extension in flush bolt is a mortise extension style unit. The retrofit plate route applies when the bottom bolt is coming out for good.
17) What finishes does the Ives FB52/FB53 flush bolt come in?
Seven finishes, and both the FB52 and the FB53 are offered in all of them: 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. If you're matching existing hardware across a building, 630 satin stainless is the usual commercial default.
18) Is the Ives FB52 flush bolt suitable for residential interior doors?
It's a commercial part. The FB52/FB53 is built for hollow metal doors in commercial settings, offices, schools, healthcare, retail, warehouse, multi-tenant residential and government buildings. For a residential wood french door pair, a solid brass flush bolt such as the Delaney 6 inch square end is the closer fit.
How fast can I get the Ives FB53 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 FB53 12 MD US32D come with a warranty?
Absolutely. The Ives FB53 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 FB53 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 FB53 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.
!