Don-Jo 1551 Aluminum Door Flus...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.60
$14.20
Don-Jo 1551 Aluminum Door Flush Bolt, 4-1/4" x 15/16", Cast Brass

Don-Jo 1551 Aluminum Door Flush Bolt, 4-1/4" x 15/16", Cast Brass

(No reviews yet) Write a Review

Model: 1551-SL
Selected Finish is

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

$16.60
$14.20
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

Don-Jo 1551 Aluminum Door Flush Bolt, 4-1/4" x 15/16", Cast Brass

The Don-Jo 1551 is a commercial-grade aluminum door flush bolt constructed from durable cast brass material, measuring 4-1/4" in length and 15/16" in width. Designed for use on aluminum doors, this flush bolt features a 1/4" offset — distinguishing it from the companion 1550 model which carries a 1/8" offset — making it ideal for applications requiring precise alignment and secure door retention. Available in DU and SL finishes to complement a variety of commercial door hardware installations.

Key Features

  • Precise Dimensions: Measures 4-1/4" in length and 15/16" in width, providing a compact and reliable flush bolt profile for aluminum door applications.
  • Cast Brass Construction: Manufactured from cast brass material for long-lasting durability and resistance to wear in commercial environments.
  • 1/4" Offset Design: Features a 1/4" offset (model 1551), offering a distinct fit compared to the 1/8" offset of the companion 1550 model for flexible installation options.
  • Multiple Finish Options: Available in DU and SL finishes to coordinate with existing door hardware and architectural requirements.
  • Commercial-Grade Application: Engineered for commercial use, providing dependable door retention performance in high-traffic settings.
  • Convenient Shelf Pack: Sold in shelf packs of 10, making it efficient for contractors and distributors managing multiple installations.

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 1551?

Don-Jo flush bolt products are built to meet the demands of commercial door hardware applications, combining cast brass construction with a precisely engineered 1/4" offset profile in the 1551 model. The 4-1/4" x 15/16" form factor delivers a reliable, low-profile solution for aluminum door installations where consistent performance and finish compatibility are essential.

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 1551-SL – Frequently Asked Questions

1) Will the Don-Jo 1551 flush bolt work on a hollow metal or wood door?
No. The 1551 is made for aluminum doors, and its 1/4 inch offset is cut for aluminum stile prep. For hollow metal, look at the ABH 1855S manual flush bolt or the Ives FB457 with a 12 inch rod, both for metal doors. For wood, the Ives FB41 automatic flush bolt set is a wood door product, as is the Adams Rite 1877 cylinder-operated flushbolt for paired wood doors.
2) What is the difference between the Don-Jo 1551 flush bolt and the Ives FB358?
The Don-Jo 1551 is a 4-1/4" x 15/16" cast brass flush bolt with a 1/4" offset built for aluminum doors, sold in DU and SL finishes. The Ives FB358 is a manual flush bolt with a 3/4" throw and a 1/2" bolt diameter, and it carries a fire rating. If the inactive leaf is part of a fire-rated pair, the FB358 is the one that answers the fire question; the 1551 is the offset-specific aluminum door part.
3) Which flush bolt should be used on a fire-rated pair of wood doors instead of the Don-Jo 1551?
The Don-Jo 1551 is designed for aluminum doors with a 1/4" offset. For a fire-rated wood door pair, the Ives FB41 is an automatic flush bolt set for wood doors with a 3/4" throw and a 90 minute fire rating, and the Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch. Those are the wood-door, fire-rated path; the 1551 is not.
4) What flush bolt has the same 1/8" offset as the Don-Jo 1550 rather than the 1/4" offset of the 1551?
Within the Don-Jo pairing, the 1550 carries a 1/8" offset and the 1551 carries the 1/4" offset in the same 4-1/4" x 15/16" cast brass body. Across brands, the International Door Closers FB-1202 is also a 1/8" offset flush bolt, with a 7/8" backset, a 5/8" throw, a positive "U" joint actuator, a square end and a guide. Measure the offset on the existing prep before ordering, since that dimension is what decides the fit.
5) Is a key-operated flushbolt available instead of the manual Don-Jo 1551?
The Don-Jo 1551 is a manually operated flush bolt in a 4-1/4" x 15/16" cast brass body. If the inactive leaf needs to be released with a key rather than by hand, Adams Rite makes cylinder-operated flushbolts: the 1870 Series is a cylinder-operated flushbolt with key control, and the 1877 is a cylinder-operated flushbolt for paired wood doors. Those change who can throw the bolt, which is the usual reason to move off a manual unit.
6) What should be used on a metal door pair rather than the Don-Jo 1551 aluminum door flush bolt?
The Don-Jo 1551 is specified for aluminum doors. For hollow metal leaves, ABH builds flush bolts for metal doors: the 1854 Series is a manual flush bolt set with a fire bolt for metal doors, and the 1855S is a manual flush bolt single for metal doors with a 3/4" throw. Ives also lists the FB457 as a manual flush bolt with a 12" rod length for metal doors, which is fire rated. Choose between the set and the single based on whether the top and bottom of the inactive leaf both need a bolt.
7) Can a 6-inch corner mount flushbolt replace the Don-Jo 1551?
Not interchangeably. The Don-Jo 1551 is a 4-1/4" x 15/16" face with a 1/4" offset for aluminum doors. The Trimco 3999 is a 6" corner mount flushbolt with a rounded end and the 3999SE is the 6" corner mount square end version; the Orca Hardware 86SQ is a 6" flush bolt with radius corners. Those are longer faceplates and, in the Trimco case, corner mounted, so the existing mortise and screw pattern from a 1551 will not line up.
8) What finishes does the Don-Jo 1551 aluminum door flush bolt come in?
Two: DU duronodic brown coated and SL silver coated. Duronodic matches dark bronze anodized storefront; silver matches clear anodized aluminum. Both are offered on the 1551 with the 1/4 inch offset.
9) What is an automatic flush bolt equivalent to the Don-Jo 1551?
The Don-Jo 1551 is thrown by hand. Automatic units set the bolt when the inactive leaf closes: the ABH 1860P/1862P is an automatic flush bolt pair, fire rated 3-hour with a thermal lock, and the Ives FB41 is an automatic flush bolt set for wood doors with a 3/4" throw and a 90 minute fire rating. Automatic bolts are the answer where staff should not have to remember to throw the bolt; manual bolts like the 1551 keep the leaf fixed until someone deliberately releases it.
10) Is a two-point flushbolt a substitute for the Don-Jo 1551?
They solve different problems. The Don-Jo 1551 is a single flush bolt with a 1/4" offset for aluminum doors. The Adams Rite MS1880/MS1881 is a two-point flushbolt with an interlock mechanism and the MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism, so one operation drives both the top and bottom bolt. Specify a two-point unit when the inactive leaf must secure at head and sill together; specify the 1551 when a single bolt location is being fitted or replaced.
11) If only the bottom bolt on the inactive leaf needs replacing, what are the options besides the Don-Jo 1551?
The Don-Jo 1551 is sold as a single flush bolt in DU and SL finishes, so one unit covers one bolt location. The ABH 1858 is a universal bottom fire bolt in the 1858 Series with manual operation, and the ABH 1855S is a manual flush bolt single for metal doors with a 3/4" throw. Match the replacement to the door material and the existing mortise depth rather than to the bolt that came out of the box.
12) What solid brass flush bolt is comparable to the cast brass Don-Jo 1551?
The Don-Jo 1551 is cast brass in a 4-1/4" x 15/16" size. For a longer brass faceplate, the Delaney 4108 is a 6" square end solid brass flush bolt. Delaney also lists mortise types: the 4101 is a 7" slide type mortise in flush bolt and the 4363 is a 7" mortise extension in flush bolt. Those 6" and 7" faces need their own mortise length, so they suit new prep more than a swap into a 1551 cutout.
13) Is the Don-Jo 1551 the right flush bolt for a residential door pair?
The Don-Jo 1551 is a commercial flush bolt in cast brass with a 1/4" offset for aluminum doors, sold in DU and SL coated finishes. On a residential opening where the flush bolt has to match decorative trim, Emtek flush bolts and the Delaney 4108 6" square end solid brass flush bolt are the finish-driven options. The 1551 is the choice where the opening is an aluminum storefront or a commercial pair.
14) Which flush bolts state a throw dimension when specifying against the Don-Jo 1551?
Where the strike pocket depth in the head or threshold is the deciding dimension, the ABH 1855S lists a 3/4" throw, the Ives FB358 lists a 3/4" throw with a 1/2" bolt diameter, the Ives FB41 lists a 3/4" throw, and the International Door Closers FB-1202 lists a 5/8" throw with a 7/8" backset. The Don-Jo 1551 is specified by its 4-1/4" x 15/16" face and 1/4" offset, which is the dimension that governs its fit on an aluminum door.
15) What material is the Don-Jo 1551 flush bolt made of?
Cast brass, with a DU or SL coated finish over it. Cast brass holds up to repeated throwing at an inactive leaf in an office, school, or retail entrance better than a stamped part, and it will not rust if the bolt sits in a wet threshold cup.
16) How many Don-Jo 1551 flush bolts come in a pack?
They ship in shelf packs of 10. Worth knowing if you only need one bolt for a single opening, and useful if you are standardizing an aluminum storefront across a building or a portfolio.
How fast can I get the Don-Jo 1551-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 1551-SL come with a warranty?
Absolutely. The Don-Jo 1551-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 1551-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 1551-SL 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.
!