Don-Jo 1555 Flush Bolt, 6-3/4"...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$27.56
$25.35
Don-Jo 1555 Flush Bolt, 6-3/4" x 1", Cast Brass with 3/4" Bolt Throw and 12" Rod

Don-Jo 1555 Flush Bolt, 6-3/4" x 1", Cast Brass with 3/4" Bolt Throw and 12" Rod

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Model: 1555-626
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$27.56
$25.35
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Don-Jo 1555 Flush Bolt, 6-3/4" x 1", Cast Brass with 3/4" Bolt Throw and 12" Rod

The Don-Jo 1555 is a commercial-grade cast brass flush bolt measuring 6-3/4" in length and 1" in width, engineered for reliable door security in demanding applications. Featuring a 3/4" bolt throw, a 3/4" rod backset, and a 12" rod length, this flush bolt delivers precise, consistent operation for paired or single door installations. The 1-1/2" adjustable bolt head provides installation flexibility, and the UL Rated construction ensures compliance with fire and safety standards. Available in a range of finishes including 605, 606, 612, 613, 625, and 626 to coordinate with existing door hardware.

Key Features

  • Precise Dimensions: Measures 6-3/4" in length and 1" in width, sized for standard commercial door applications requiring a low-profile flush bolt solution.
  • 3/4" Bolt Throw: Delivers a secure 3/4" bolt throw for dependable door retention and positive latching performance.
  • 3/4" Rod Backset: A 3/4" rod backset ensures accurate alignment with door frame strike locations for smooth, reliable operation.
  • 12" Rod Length: The 12" rod length accommodates standard door configurations and provides consistent actuation from the bolt head to the operating mechanism.
  • 1-1/2" Adjustable Bolt Head: The adjustable bolt head allows for fine-tuned positioning during installation, reducing the need for additional modifications.
  • Cast Brass Construction: Manufactured from cast brass for superior durability, corrosion resistance, and long-term performance in commercial environments.
  • UL Rated: UL Rated construction meets fire and safety code requirements for use in rated door assemblies.
  • Multiple Finish Options: Available in finishes 605, 606, 612, 613, 625, and 626 to match a wide variety of architectural hardware specifications.

Certifications & Compliance

  • UL Rated
  • ANSI: L14251

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Subcategory: Flush Bolts
  • Product Subgroup: Flush Bolts
  • Product Type: Flush Bolts
  • Commercial/Residential: Commercial
  • Rod Length: 12"
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

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

Why Don-Jo 1555?

Don-Jo 1555 Flush Bolt products are built from cast brass, delivering the corrosion resistance and structural integrity required for high-traffic commercial door applications. With UL Rated construction and ANSI L14251 compliance, the 1555 meets the rigorous demands of fire-rated door assemblies and professional hardware specifications. Engineered for dependable performance, this flush bolt is a trusted choice for contractors and facility managers seeking reliable, code-compliant door hardware.

Manufacturer Resources

DON-JO Bolts & Latches

Product Specs

Product Group:
Door Trim and Accessories
Subcategory:
Flush Bolts
Product Subgroup:
Flush Bolts
Product Type:
Flush Bolts
Commercial/Residential:
Commercial
Bolt Throw:
3/4"
Rod Length:
12"
ANSI/BHMA:
L14251
Product Model:
1555
Product Category:
Door Trim and Accessories
Product Substrate:
Cast Brass
Backset (Distance):
3/4"
Department:
Door Hardware

Don-Jo 1555-626 – Frequently Asked Questions

1) Will the Don-Jo 1555 flush bolt work on a pair of doors with no center mullion?
That's exactly what a manual flush bolt like the 1555 is for. It mortises into the edge of the inactive leaf of a pair and throws a 3/4 inch bolt into the head frame or the threshold, holding that leaf fixed so the active leaf has something to latch against. It's manually operated, so someone has to reach up and throw the bolt at the top; if you need the inactive leaf to release automatically when the active leaf opens, an automatic set like the Ives FB41 for wood doors is the different animal you want.
2) How deep does the Don-Jo 1555 bolt engage the strike, and will it reach my existing frame prep?
The bolt throws 3/4 inch on a 3/4 inch backset, so the bolt centerline sits 3/4 inch back from the door edge and the head or floor strike has to be drilled to match that centerline. Get the backset right and it drops into a standard flush bolt prep. If your existing strike hole is set at a different centerline, the bolt will bind rather than seat, and the shorter-throw units in the category won't help either, the International Door Closers FB-1202 for example runs a 5/8 inch throw on a 7/8 inch backset.
3) Can I use the Don-Jo 1555 flush bolt on a fire rated door assembly?
The 1555 is UL Rated and carries the ANSI/BHMA L14251 designation, so it's built for use in rated openings. Cast brass body, commercial duty. As with any rated opening, the bolt has to match what the door manufacturer's label allows for that assembly.
4) How tall a door will a 12 inch rod flush bolt cover?
The Don-Jo 1555 ships with a 12 inch rod, which puts the operating lever about a foot down from the top of the bolt head. On a standard 6 foot 8 inch or 7 foot leaf that's within normal reach. On a tall door where the head is 8 feet or higher, a 12 inch rod leaves the lever above comfortable reach, and a longer rod length is the fix. The Ives FB457 is also built around a 12 inch rod if you're cross-shopping the same reach.
5) How much door edge do I need to mortise in a Don-Jo 1555?
The faceplate measures 6-3/4 x 1 inches, so you need a mortise pocket that long in the door edge plus clearance for the rod running above it. The 1 inch face suits a standard commercial door edge. If your edge or pocket is shorter, 6 inch flush bolts exist in the category, the Trimco 3999SE square end and the Orca Hardware 86SQ are both 6 inch corner mount units.
6) Is one Don-Jo 1555 enough, or do I need two per pair of doors?
One 1555 is a single bolt. Standard practice on a pair is two, one at the head and one at the sill of the inactive leaf, so order in pairs unless the opening only calls for a top bolt. Each one is its own 6-3/4 x 1 inch mortise with its own 12 inch rod and its own strike prep, top into the frame head, bottom into the threshold or floor.
7) What is the closest equivalent to the Don-Jo 1555 flush bolt with a 12 inch rod for a metal door?
The Ives FB457 is a manual flush bolt built with a 12 inch rod length for metal doors, which matches the Don-Jo 1555's 12 inch rod length. Both are manually operated flush bolts rather than automatic ones, so the operation on the inactive leaf is the same: throw the bolt by hand at the bolt head. The 1555 is cast brass with a 3/4 inch bolt throw and a 3/4 inch backset, and it is offered in 605, 606, 612, 613, 622, 625 and 626 finishes. If the door prep already accepts a 12 inch rod, the FB457 is the direct cross for metal leaves.
8) Which flush bolt has the same 3/4 inch bolt throw as the Don-Jo 1555?
Three peers carry the same 3/4 inch throw. The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw. The Ives FB358 is a manual flush bolt with a 3/4 inch throw and a 1/2 inch bolt diameter. The Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw. The Don-Jo 1555 also throws 3/4 inch, in cast brass, with a 3/4 inch backset and a 1-1/2 inch adjustable bolt head. Throw is what governs strike engagement depth, so any of these will seat the same distance into the head or threshold strike; the difference is manual versus automatic operation and whether the set is prepped for wood or metal.
9) The inactive leaf keeps getting left unbolted. What should I use instead of a manual flush bolt?
Switch to an automatic flush bolt, which throws the bolt when the active leaf closes instead of relying on someone to do it by hand. The Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw, carrying a 90 minute fire rating. The Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch. The ABH 1860P/1862P is an automatic flush bolt pair, fire rated 3 hour, with a thermal lock. The Adams Rite MS2180 is an auto-release two-point flushbolt using a Smartlock mechanism. The Don-Jo 1555 is a manual bolt, thrown at the bolt head, so it is the right choice where the inactive leaf stays fixed and the wrong one where it is opened daily.
10) I need the inactive leaf locked with a key, not just bolted. What replaces the Don-Jo 1555?
A cylinder-operated flushbolt puts the inactive leaf under key control rather than hand operation. 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. The Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism, which drives top and bottom together. The Don-Jo 1555 is a manual flush bolt with a 3/4 inch throw and no cylinder, so it secures the leaf but does not give a keyed audit path. For a locksmith standardizing a keyway across an opening, the cylinder-operated models are the ones that accept a cylinder.
11) Does the Don-Jo 1555 satisfy a fire rated pair, or do I need a fire bolt?
The Don-Jo 1555 is UL Rated and carries ANSI L14251, with cast brass construction. Where an inspector calls out a dedicated fire bolt, the ABH 1854 Series is a manual flush bolt set supplied with a fire bolt for metal doors, and the ABH 1858 is a universal bottom fire bolt with manual operation. The Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch, and the ABH 1860P/1862P pair is fire rated 3 hour with a thermal lock. An institutional buyer should match the bolt to the rating on the door label and the leaf material, since the ABH and Ives sets above are split between metal and wood door prep.
12) My frame prep has a 7/8 inch backset. Will the Don-Jo 1555 work, or do I need a different flush bolt?
The Don-Jo 1555 is built to a 3/4 inch backset with a 3/4 inch bolt throw, so a 7/8 inch prep will not line the bolt up with the strike. The International Door Closers FB-1202 is a flush bolt with a positive U joint actuator, a 5/8 inch throw and a 1/8 inch offset with a 7/8 inch backset, square end, supplied with a guide. That is the one to order against an existing 7/8 inch backset prep. Confirm the backset on the door edge before ordering either, since backset and throw together decide whether the bolt seats.
13) What if the bolt doesn't line up with the strike after the door is hung?
The 1555 has a 1-1/2 inch adjustable bolt head, so you can fine tune where the bolt sits after the door is in the frame rather than re-drilling the strike. That's the main reason to reach for it over a fixed head bolt when you're working with an existing opening that has settled or a frame that isn't perfectly plumb.
14) Do I need a key to operate the Don-Jo 1555, or is it a lever?
It's a manual lever bolt, no cylinder and no key. You slide the lever on the face to throw or retract it, which means anyone on the accessible side of the inactive leaf can release it. If you need the inactive leaf locked down so only a keyholder can free it, that's a cylinder-operated flushbolt, the Adams Rite 1870 Series with key control or the 1877 for paired wood doors.
15) What finishes does the Don-Jo 1555 come in, and can I match the rest of my hardware?
Seven finishes: 605 polished brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 622 matte black, 625 polished chrome and 626 satin chrome. For a building already standardized on satin chrome trim, 626 is the usual match; 626 and 613 are the two that get specified most on commercial openings. Because the body is cast brass, the plated brass finishes are on solid material rather than a coated steel stamping.
16) Manual flush bolt or automatic flush bolt, which do I need for my inactive leaf?
Manual, like the Don-Jo 1555, means someone throws and retracts the bolt by hand at the leaf. Right for a leaf that stays shut most of the time and only opens to move equipment or furniture. Automatic sets retract the inactive leaf's bolts when the active leaf closes against them, which is what you want on an egress pair where nobody should have to stop and free the second leaf. The Ives FB41 set and the ABH 1860P/1862P pair are the automatic route; the 1860P pair is fire rated 3 hour with a thermal lock.
17) Is a 6 inch corner mount flushbolt the same thing as the Don-Jo 1555?
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. Corner mount bolts mortise into the corner of the door edge and face, which is a different prep from an edge-mounted bolt. The Don-Jo 1555 measures 6-3/4 inch by 1 inch with a 12 inch rod and a 1-1/2 inch adjustable bolt head, so the mortise pocket, the faceplate footprint and the rod channel are all different. Ordering a corner mount to replace the 1555 means re-prepping the leaf.
18) What is a simpler flush bolt than the Don-Jo 1555 for an interior double door in a residential or light duty opening?
The Delaney 6 inch square end solid brass flush bolt and the Delaney 7 inch slide type mortise in flush bolt are straightforward slide bolts sized for interior paired doors, as is the Orca Hardware 6 inch flush bolt with radius corners. Emtek also offers flush bolts. The Don-Jo 1555 is specified for commercial use, built in cast brass with a UL Rated construction and ANSI L14251, and it runs a 12 inch rod, which is more bolt than a light duty interior pair usually calls for. If the opening is not fire rated and not high traffic, the shorter slide type bolts cover it.
19) What is the difference between the Don-Jo 1555 and a two-point flushbolt?
The Don-Jo 1555 is a single flush bolt with one 3/4 inch throw bolt and a 12 inch rod, so a pair of doors normally takes one at the head and one at the sill, each operated on its own. A two-point flushbolt drives both points from one mechanism: the Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism and the Adams Rite MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism. Count the bolt heads you need before ordering, because one two-point unit covers what two single bolts otherwise cover.
20) I only need the bottom bolt replaced on a pair of doors. Do I have to buy a full set?
No. The Don-Jo 1555 is a single flush bolt, 6-3/4 inch by 1 inch, with a 12 inch rod and a 1-1/2 inch adjustable bolt head, so it can be ordered on its own for one position. Among peers, the ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw and the ABH 1858 is a universal bottom fire bolt with manual operation. Sets such as the ABH 1854 Series and the Ives FB41 automatic flush bolt set are supplied as sets covering both positions.
21) Which flush bolts are made for wood doors rather than metal?
The Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw, the Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch, and the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors. On the metal side, the ABH 1854 Series and the ABH 1855S are built for metal doors, as is the Ives FB457 with its 12 inch rod. The Don-Jo 1555 is a cast brass commercial flush bolt with a 3/4 inch backset and a 3/4 inch throw; match the mortise depth in the leaf you have before committing either way.
22) Is the Don-Jo 1555 rated for commercial traffic or is it a residential bolt?
Commercial duty, and the cast brass body is the reason: it's solid material rather than a formed sheet part, so the lever and bolt hold up in office, school, healthcare and multi-family openings that get worked constantly. Residential grade brass flush bolts like the Delaney 6 inch solid brass unit cover lighter interior door use.
23) I want a square end faceplate to match the other bolts in the building. What are my options?
The Trimco 3999SE is a 6 inch corner mount flushbolt with a square end, the Delaney 6 inch solid brass flush bolt is a square end, and the International Door Closers FB-1202 is a square end bolt with a guide. For a rounded profile, the Trimco 3999 is the 6 inch corner mount rounded end and the Orca Hardware 6 inch flush bolt has radius corners. The Don-Jo 1555 runs 6-3/4 inch by 1 inch in cast brass and comes in 605 polished brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 622 matte black, 625 polished chrome and 626 satin chrome, which is the wider finish range if the goal is matching existing trim across a fleet of openings.
24) Is the Delaney 7 inch mortise extension flush bolt a substitute for the Don-Jo 1555?
They are not the same part. The Delaney 7 inch mortise extension flush bolt is an extension type bolt, while the Don-Jo 1555 is a 6-3/4 inch by 1 inch cast brass flush bolt with a fixed 12 inch rod, a 3/4 inch throw and a 1-1/2 inch adjustable bolt head. Where the 1555 gives its adjustment at the bolt head, the Delaney is built around extending the reach from the mortise. Check the distance from the faceplate to the strike on the actual opening; that measurement decides which of the two suits it.
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Does the Don-Jo 1555-626 come with a warranty?
Absolutely. The Don-Jo 1555-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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