Don-Jo RB-50 Aluminum Door Flu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2.46
$2.15
Don-Jo RB-50 Aluminum Door Flush Bolt in White — Replacement for 1550 & 1551

Don-Jo RB-50 Aluminum Door Flush Bolt in White — Replacement for 1550 & 1551

(No reviews yet) Write a Review

Model: RB-50

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

$2.46
$2.15
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 RB-50 Aluminum Door Flush Bolt in White — Replacement for 1550 & 1551

The Don-Jo RB-50 is a White Aluminum Door Flush Bolt engineered as a direct replacement bolt for Don-Jo models 1550 and 1551. Constructed from durable plastic material with a clean White finish, this flush bolt is designed for commercial door applications where a reliable, low-profile latching solution is required. Sold in a convenient shelf pack of 10, the RB-50 is an ideal stocking item for facilities managers, contractors, and hardware distributors who need dependable replacement components on hand.

Key Features

  • Direct Replacement Compatibility: Specifically designed as a replacement bolt for Don-Jo models 1550 and 1551, ensuring a precise fit and reliable performance without modification.
  • White Finish: Clean White finish blends seamlessly with white-painted or white-framed door assemblies for a polished, unobtrusive appearance.
  • Plastic Construction: Manufactured from durable plastic material that resists corrosion and provides long-lasting performance in commercial environments.
  • Commercial-Grade Application: Rated and intended for commercial use, making it suitable for demanding door hardware installations in high-traffic settings.
  • Convenient Shelf Pack Quantity: Available in a shelf pack of 10 units, ideal for contractors, maintenance teams, and distributors requiring multiple replacement bolts.
  • Flush Bolt Design: Low-profile flush bolt configuration mounts flush within the door edge, maintaining door aesthetics while providing secure latching functionality.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Subcategory: Flush Bolts
  • Product Subgroup: Flush Bolts
  • Product Type: Flush Bolts
  • Commercial/Residential: Commercial
  • Product Model: 50
  • 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 RB-50?

Don-Jo flush bolt products are built to deliver consistent, commercial-grade performance using durable materials suited for demanding door hardware applications. The RB-50 replacement bolt is engineered for precise compatibility with Don-Jo 1550 and 1551 models, eliminating guesswork and ensuring a reliable fit for maintenance and replacement projects. For facilities and contractors who depend on quality replacement components, the Don-Jo RB-50 is a trusted, purpose-built solution.

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:
50
Product Category:
Door Trim and Accessories
Product Substrate:
Plastic
Department:
Door Hardware

Don-Jo RB-50 – Frequently Asked Questions

1) What does the Don-Jo RB-50 flush bolt actually replace?
The RB-50 is the replacement bolt for Don-Jo 1550 and 1551 flush bolts, not a complete flush bolt assembly. If the bolt on an existing Don-Jo 1550 or 1551 is broken or worn and the rest of the unit is sound, this is the piece you order. If you are hanging new doors or the whole flush bolt is failing, you need a full flush bolt set instead.
2) Will the Don-Jo RB-50 fit a flush bolt from another brand, like an Ives or Trimco?
No. The RB-50 is made to fit Don-Jo 1550 and 1551 flush bolts only. Bolt bodies, throws and mounting are not interchangeable between manufacturers, so it will not drop into an Ives, Trimco, ABH or Adams Rite unit. If the failed bolt is on another brand, replace the complete flush bolt: ZenSupply carries the Trimco 3999 6 inch corner mount and the Ives FB358 manual flush bolt, among others.
3) I need a flush bolt for a pair of doors with no mullion. Is the Don-Jo RB-50 what I want?
Not on its own. The RB-50 is a replacement bolt for an existing Don-Jo 1550 or 1551, so it only helps if that unit is already mortised into the inactive leaf. For a new pair of doors you want a complete flush bolt set: the ABH 1854 set with fire bolt or the Ives FB457 for metal doors, the Ives FB41 automatic set or the Adams Rite 1877 cylinder-operated flushbolt for wood doors, or the Adams Rite MS1880 two-point flushbolts where you want top and bottom driven together.
4) What flush bolt should be used on a fire-rated opening rather than the Don-Jo RB-50 replacement bolt?
The Don-Jo RB-50 is a plastic replacement bolt for Don-Jo 1550 and 1551 flush bolts and is not a fire bolt. For fire-rated pairs, the ABH 1860P/1862P is an automatic flush bolt pair that is fire rated 3-hour with a thermal lock, the ABH 1858 is a universal bottom fire bolt with manual operation, and the Ives FB41 automatic flush bolt set for wood doors carries a 90 minute fire rating. The Ives FB42 top automatic flush bolt for wood doors includes an auxiliary fire latch.
5) The RB-50 replacement bolt only fits Don-Jo 1550 and 1551 -- what is a complete manual flush bolt set for a pair of metal doors instead?
The Don-Jo RB-50 is a plastic replacement bolt made for Don-Jo 1550 and 1551 units, so it is the wrong part when there is no existing 1550 or 1551 in the door. For a complete manual flush bolt on metal doors, the ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, and the ABH 1854 Series is a manual flush bolt set that includes a fire bolt for metal doors. The Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors. Any of those three is a full bolt assembly rather than a replacement component.
6) What mortise-style flush bolt fits a door edge that was never prepped for a Don-Jo 1550 or 1551?
The Don-Jo RB-50 replaces the bolt in a Don-Jo 1550 or 1551 and depends on that existing prep. Where the edge has to be cut fresh, the Delaney 4101xx is a 7 inch slide type mortise-in flush bolt and the Delaney 4363xx is a 7 inch mortise extension flush bolt. The International Door Closers 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, square end, supplied with a guide -- the backset and offset figures let the prep be laid out before the door is cut.
7) Is a plastic flush bolt strong enough for a commercial door?
The RB-50 bolt is plastic and is rated for commercial use. It is a latching component in an inactive leaf, not a security bolt carrying door weight or forced-entry load, which is why the plastic body works in that role. On openings where a metal bolt is specified, or where the leaf sees abuse, use a full metal-bodied set such as the ABH 1855S with a 3/4 inch throw or the Ives FB457 with a 12 inch rod for metal doors.
8) How many Don-Jo RB-50 bolts come in a pack?
The RB-50 ships in a shelf pack of 10 bolts. That suits a maintenance shop or a distributor keeping spares on the shelf for a building already standardized on Don-Jo 1550 or 1551 flush bolts. For a single repair you are still buying the ten.
9) What is the difference between the Don-Jo RB-50 and an automatic flush bolt like the Ives FB41 or ABH 1860P?
The Don-Jo RB-50 is a plastic replacement bolt that restores an existing Don-Jo 1550 or 1551 flush bolt, and those units are thrown by hand at the door edge. An automatic flush bolt sets and releases with the movement of the inactive leaf: the Ives FB41 is an automatic flush bolt set for wood doors with a 3/4 inch throw, and the ABH 1860P/1862P is an automatic flush bolt pair, fire rated 3-hour with a thermal lock. The Adams Rite MS2180 Series is an auto-release two-point flushbolt using a Smartlock mechanism. Those are complete operating assemblies, not replacement bolts.
10) Is the Don-Jo RB-50 a substitute for a two-point flush bolt on a pair of doors?
No. The Don-Jo RB-50 is a single plastic replacement bolt for Don-Jo 1550 and 1551 flush bolts, sold in a shelf pack of 10 for stocking. A two-point bolt secures the inactive leaf at both head and sill 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. Ordering RB-50 bolts will not produce two-point control on an opening.
11) The RB-50 is white plastic -- what flush bolt matches a brass or decorative door instead?
The Don-Jo RB-50 has a plastic substrate in a white finish and is intended as a replacement bolt for Don-Jo 1550 and 1551. For an opening where the bolt face is meant to be seen and match brass or decorative trim, the Delaney 4108xx is a 6 inch square end solid brass flush bolt, 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 in a square end. The Orca Hardware 86SQ is a 6 inch flush bolt with radius corners.
12) Does the white Don-Jo RB-50 come in other finishes?
White is the only finish the RB-50 is offered in. On a white-painted or white aluminum storefront leaf it disappears; on a dark or anodized door edge it will read as white against the frame, so factor that in before ordering the ten pack.
How fast can I get the Don-Jo RB-50 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 RB-50 come with a warranty?
Absolutely. The Don-Jo RB-50 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 RB-50?
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 RB-50 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.
!