Don-Jo Flush-Bolt Aluminum Doo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.60
$14.20
Don-Jo Flush-Bolt Aluminum Door Flush Bolt 4-1/4" x 15/16" Cast Brass

Don-Jo Flush-Bolt Aluminum Door Flush Bolt 4-1/4" x 15/16" Cast Brass

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Model: 1550-SL
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$16.60
$14.20
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Don-Jo Flush-Bolt Aluminum Door Flush Bolt 4-1/4" x 15/16" — Cast Brass Construction

The Don-Jo Flush-Bolt is a commercial-grade aluminum door flush bolt crafted from durable cast brass material, measuring 4-1/4" in length and 15/16" in width for a precise, low-profile fit on aluminum doors. Available in DU and SL finishes, this flush bolt is offered in two offset configurations — Model 1150 with a 1/8" offset and Model 1151 with a 1/4" offset — providing flexible installation options to accommodate varying door and frame conditions. Designed for commercial applications, it delivers reliable door retention performance in a compact, professional form factor.

Key Features

  • Precise Dimensions: Measures 4-1/4" in length and 15/16" in width, providing a compact and accurate fit for aluminum door applications.
  • Cast Brass Construction: Manufactured from cast brass material for exceptional durability and long-term performance in demanding commercial environments.
  • Dual Offset Options: Available in Model 1150 with a 1/8" offset and Model 1151 with a 1/4" offset to accommodate a variety of door and frame configurations.
  • Multiple Finish Options: Offered in DU and SL finishes to complement a range of door hardware aesthetics and project specifications.
  • Commercial-Grade Design: Engineered specifically for commercial use, ensuring reliable door retention and consistent operation in high-traffic settings.
  • Convenient Shelf Pack: Supplied in a shelf pack of 10 units, making it ideal for contractors, distributors, and facility managers stocking multiple installations.

Certifications & Compliance

  • Commercial-Grade Product — Suitable for Commercial Applications

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Subcategory: Flush Bolts
  • Product Subgroup: Flush Bolts
  • Product Type: Flush Bolts
  • Commercial/Residential: Commercial
  • Product Model: 1150, 1151
  • 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 Flush-Bolt?

Don-Jo flush bolt products are built from cast brass material, delivering the structural integrity and corrosion resistance required for reliable performance in commercial door applications. With two offset configurations and multiple finish options, the Don-Jo Flush-Bolt series offers the installation flexibility professionals need to meet diverse project requirements. Engineered for commercial-grade use, these flush bolts provide consistent, dependable door retention across a wide range of high-traffic environments.

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
Product Model:
1150, 1151
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Don-Jo 1550-SL – Frequently Asked Questions

1) Will the Don-Jo 1550 flush bolt work on a hollow metal or wood door, or is it only for aluminum?
The Don-Jo 1550 is built specifically for aluminum doors, and the offset construction is what makes that true: the bolt body is stepped 1/8 inch to sit against the narrow stile of an aluminum storefront door. On a hollow metal or wood door you want a bolt made for that leaf instead. For metal doors, the ABH 1855S manual flush bolt or the Ives FB457 with a 12 inch rod are the metal-door products; for wood, the Ives FB41 automatic set is the wood-door version.
2) Is the Don-Jo flush bolt automatic or manual, and does that matter for a fire rated pair?
It is a manually operated flush bolt, thrown and retracted by hand at the inactive leaf. Manual bolts are fine for a pair that is not fire rated. If your opening needs a fire rated pair with self-latching, you want an automatic or constant-latching bolt instead: the ABH 1860P/1862P automatic pair carries a 3-hour fire rating, and the Ives FB41 automatic set for wood doors is rated 90 minutes.
3) What is the difference between the Don-Jo 1150/1151 flush bolt and the IDC FB-1202 flush bolt?
Both are square-end manual flush bolts offered in a 1/8 inch offset. The Don-Jo Flush-Bolt is a cast brass bolt measuring 4-1/4 inches long by 15/16 inch wide, built for aluminum doors, with model 1150 carrying the 1/8 inch offset and model 1151 the 1/4 inch offset. The International Door Closers FB-1202 is a square end flush bolt with a positive U joint actuator, a 5/8 inch throw, a 1/8 inch offset with a 7/8 inch backset, and it ships with a guide. If the opening needs a stated throw and backset for the strike prep, the FB-1202 publishes both; if the frame condition calls for a 1/4 inch offset, the Don-Jo 1151 covers that and the FB-1202 does not.
4) I need a flush bolt on a fire rated pair, not an aluminum storefront door - what should I use instead of the Don-Jo 1150?
The Don-Jo Flush-Bolt is a commercial aluminum door flush bolt in cast brass, and its published attributes are dimensional and finish related rather than fire related. For a fire rated pair, the Ives FB358 manual flush bolt is fire rated and has a 3/4 inch throw with a 1/2 inch bolt diameter, and the Ives FB41 automatic flush bolt set for wood doors carries a 90 minute fire rating with a 3/4 inch throw. On metal doors, the ABH 1854 Series is a manual flush bolt set supplied with a fire bolt, and the ABH 1860P/1862P automatic flush bolt pair is fire rated 3 hour with a thermal lock. Match the leaf material - wood versus metal - to the set before ordering.
5) The Don-Jo 1150 has to be thrown by hand at each leaf - what automatic or self releasing flush bolt can I use instead?
The Don-Jo Flush-Bolt 1150 and 1151 are manual bolts operated at the bolt. If the inactive leaf should set and release without a separate motion, 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 ABH 1860P/1862P is an automatic flush bolt pair. On aluminum stile doors, the Adams Rite MS2180 Series is an auto release two point flushbolt with a Smartlock mechanism, and the Adams Rite MS1880/MS1881 is a two point flushbolt with an interlock mechanism.
6) For a hollow metal door pair, is the Don-Jo aluminum flush bolt the right part or is there a metal door specific bolt?
The Don-Jo Flush-Bolt is described for aluminum doors, with the 1/8 inch and 1/4 inch offsets sized to aluminum door and frame conditions. For hollow metal leaves there are bolts specified for metal doors: the ABH 1854 Series manual flush bolt set with fire bolt, the ABH 1855S manual single with a 3/4 inch throw, and the Ives FB457 manual flush bolt with a 12 inch rod length, which is fire rated. The 12 inch rod on the FB457 is the item to check against the top rail clearance before ordering.
7) What finishes does the Don-Jo aluminum flush bolt come in?
Two: DU, a duronodic brown coating, and SL, a silver coating. Duronodic brown matches dark bronze anodized storefront framing, and silver matches clear anodized aluminum. Both are offered in the 1/8 inch offset model, so on a building with mixed frame colors you can standardize on one bolt and just change the finish call-out per opening.
8) What else could I use instead of a Don-Jo flush bolt on an aluminum storefront pair?
For aluminum openings the closest alternatives are the Adams Rite MS1880/MS1881 two-point flushbolts with an interlock mechanism, or the MS2180 Series auto-release two-point flushbolt with the Smartlock mechanism. Both are two-point, meaning one operation throws top and bottom together, where the Don-Jo is a single bolt you set individually. The International Door Closers FB-1202 is another single flush bolt with the same 1/8 inch offset, a 5/8 inch throw and a 7/8 inch backset.
9) I need a flush bolt for a pair of wood doors with a decorative finish, not aluminum. What should I look at?
The Don-Jo 1550 is the wrong part for that opening; it is an aluminum door bolt with a 4-1/4 x 15/16 inch footprint. For wood door pairs, the Delaney 6 inch square end solid brass flush bolt or the 7 inch slide type mortise flush bolt suit residential and light commercial wood leaves, and Emtek flush bolts are the decorative option. Trimco's 3999 (rounded end) and 3999SE (square end) are 6 inch corner mount bolts if you need a commercial corner mount instead of a mortise.
10) Do I need to order anything else with the Don-Jo flush bolt to finish the job?
A flush bolt only holds the inactive leaf; the active leaf still needs its own lock or exit device. Plan on two bolts per inactive leaf if you are securing at both head and threshold, and a strike at each point, top into the frame head and bottom into the floor or threshold. On an aluminum storefront that bottom strike is usually a dust proof floor strike drilled into the threshold.
11) Is a mortise flush bolt the same thing as the Don-Jo aluminum door flush bolt?
No. The Don-Jo Flush-Bolt is a 4-1/4 inch by 15/16 inch cast brass bolt made for aluminum doors and offered in a 1/8 inch offset on model 1150 and a 1/4 inch offset on model 1151, with the offset accommodating the door and frame condition. The Delaney 4101 is a 7 inch slide type mortise in flush bolt and the Delaney 4363 is a 7 inch mortise extension flush bolt, while the Delaney 4108 is a 6 inch square end solid brass flush bolt. Mortise in bolts of 6 to 7 inches are cut into the leaf edge and generally suit wood or thicker stile leaves rather than a narrow aluminum stile, so confirm the stile width before treating one as an alternative.
12) Can I key a flush bolt so tenants cannot release the inactive leaf, like the Don-Jo 1150 but with a cylinder?
The Don-Jo Flush-Bolt 1150 and 1151 are manually operated bolts with no cylinder provision - the lever or actuator is reached at the bolt itself. When the inactive leaf has to stay under key control, 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. Choose by leaf material: the 1877 is specified for paired wood doors, while the Don-Jo is an aluminum door bolt.
13) What is the difference between a 4-1/4 inch flush bolt and the 6 inch corner mount flushbolts like the Trimco 3999?
The Don-Jo Flush-Bolt is 4-1/4 inches long by 15/16 inch wide, a low profile face for aluminum stile doors where there is little room in the stile. The Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end and the Trimco 3999SE is the same 6 inch corner mount with a square end; the Orca Hardware 86SQ Series is a 6 inch flush bolt with radius corners. Corner mount bolts of that length are mortised into the stile edge and corner of the leaf, so the mortise prep and the visible face plate are different from a 4-1/4 inch aluminum door bolt - they are not a drop in swap for the same cut out.
14) I only need a bolt at the bottom of the inactive leaf, not a top and bottom set - what are my options next to the Don-Jo 1150?
The Don-Jo Flush-Bolt is sold as a single 4-1/4 inch by 15/16 inch bolt in DU and SL finishes, so it can be used at one position rather than as a matched pair. Among single and bottom specific bolts, the ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, and the ABH 1858 Series is a universal bottom fire bolt of manual operation. Note the leaf material difference - the ABH singles are specified for metal doors, while the Don-Jo is an aluminum door bolt.
15) What is a two point flushbolt and does the Don-Jo 1150 do the same job?
A two point flushbolt engages the inactive leaf at two 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. The Don-Jo Flush-Bolt is a single bolt, 4-1/4 inches by 15/16 inch in cast brass, thrown at its own position, so a pair of them is not mechanically linked the way a two point unit is. For a pair of aluminum doors where both points must move together, the two point units cover that; for individual bolt replacement in an existing prep, the Don-Jo 1150 with a 1/8 inch offset or 1151 with a 1/4 inch offset is the direct type.
16) Is Don-Jo's flush bolt strong enough for a high traffic commercial entrance?
The body is cast brass rather than stamped or extruded, which is why it holds up on doors that cycle all day, and it is built as a commercial-grade part for offices, schools, healthcare, retail, warehouses, and municipal buildings. Cast brass also resists corrosion, so it is a reasonable choice on an exterior storefront leaf.
17) How many Don-Jo flush bolts come in a pack?
They ship in a shelf pack of 10. For a property manager or contractor doing one pair of doors that is more than you need, since a pair takes a top and bottom bolt on the inactive leaf. It works out well if you are stocking a truck or standardizing bolts across a building's storefront openings.
How fast can I get the Don-Jo 1550-SL 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 Don-Jo 1550-SL come with a warranty?
Absolutely. The Don-Jo 1550-SL 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 Don-Jo 1550-SL?
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 Don-Jo 1550-SL from ZenSupply?
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Product Reviews

  • 5
    flush bolt

    Posted by Shane on Nov 11th 2025

    shipped fast seems like its quality made

!