Arrow 124 Deadlatch MK Series ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$51.66
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Arrow 124 Deadlatch MK Series Replacement Part, 2-3/4" Backset, 2-1/4" x 1-1/8" Face, Square Corner, UL Listed

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Model: 124 26D

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

$51.66
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Arrow 124 Deadlatch MK Series Replacement Part, 2-3/4" Backset, 2-1/4" x 1-1/8" Face, Square Corner, UL Listed

The Arrow 124 Deadlatch is a precision-engineered replacement component designed for the MK Series lock system, delivering dependable mechanical latch operation in commercial door applications. Featuring a 2-3/4" backset and a 2-1/4" x 1-1/8" face plate with a square corner profile, this deadlatch is engineered for exact fitment within compatible Arrow MK Series locksets. UL Listed for added assurance, it is finished in Bright Brass to match existing MK Series hardware. This commercial-grade replacement part restores proper latching function and is intended for use with Arrow MK Series locks in a variety of professional settings.

Key Features

  • Precise Backset Dimension: 2-3/4" backset provides accurate door prep alignment for standard commercial door configurations.
  • Accurate Face Plate Size: 2-1/4" x 1-1/8" face plate dimensions ensure a clean, flush fit within the mortise pocket of compatible doors.
  • Square Corner Profile: Square corner face design meets standard commercial door preparation requirements for a professional finished appearance.
  • MK Series Compatibility: Engineered specifically as a replacement part for Arrow MK Series locksets, ensuring proper mechanical function and fitment.
  • UL Listed: Carries UL listing for verified performance and safety compliance in commercial applications.
  • Bright Brass Finish: Bright Brass finish coordinates with existing Arrow MK Series hardware for a consistent, cohesive appearance.
  • Commercial-Grade Construction: Designed and rated for commercial door hardware applications where reliable, long-term latch performance is required.

Certifications & Compliance

  • UL Listed
  • Commercial-Grade Rating

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: Latches
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: 124
  • Features: Arrow Parts

Typical Applications

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

Why Arrow 124?

Arrow MK Series components are engineered to exacting commercial standards, with the 124 Deadlatch offering UL Listed performance in a precision-dimensioned replacement part. With a 2-3/4" backset and 2-1/4" x 1-1/8" square corner face, this deadlatch delivers the accuracy and durability that commercial facility managers and locksmiths rely on for dependable MK Series lock maintenance and restoration.

Manufacturer Resources

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Latches
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
124
Features:
Arrow Parts

Arrow 124 26D – Frequently Asked Questions

1) Will the Arrow 124 deadlatch fit a door prepped for a 2-3/8 inch backset?
No. The Arrow 124 deadlatch is a fixed 2-3/4 inch backset part, so it needs a door bored on the 2-3/4 inch centerline. If your prep is 2-3/8 inch you need a latch built for that backset, such as the Kwikset 84290 square corner plainlatch at 2-3/8 inch, or an adjustable drive-in latch like the Deltana DLP23875 that covers both 2-3/8 and 2-3/4 inch.
2) What face plate size and corner style does the Arrow 124 latch use?
The face measures 2-1/4 x 1-1/8 inches with a square corner profile, which is the standard commercial square-corner prep. If the existing latch you are pulling out has radius (round) corners, the square face will not drop into that mortise pocket without re-routing the edge of the door.
3) Which Arrow locks does the 124 deadlatch replace the latch on?
It is built as a replacement latch for Arrow MK Series locksets. It is the latch unit only, not a complete lock, so the existing MK Series lever or knob chassis and trim stay on the door.
4) What is the difference between the Arrow 124 deadlatch and the Kwikset 84290 square corner plainlatch?
Both are square corner latches, but they differ in two ways that matter at the door. The Arrow 124 is a deadlatch built as a replacement component for Arrow MK Series locksets, with a 2-3/4 inch backset and a 2-1/4 inch by 1-1/8 inch face. The Kwikset 84290 is a plainlatch with a 2-3/8 inch backset. A plainlatch has no deadlocking plunger alongside the latchbolt, so if the opening calls for a deadlatching function at a 2-3/4 inch backset, the Arrow 124 is the part that matches.
5) I need a latch for a bored door where the backset can be either 2-3/8 or 2-3/4 inches. Will the Arrow 124 work?
The Arrow 124 is fixed at a 2-3/4 inch backset and is built for Arrow MK Series locksets, so it does not adjust. For a bored door where the backset has to cover both dimensions, the Deltana DLP23875 drive-in latch has an adjustable backset of 2-3/8 or 2-3/4 inches in a passage/privacy function and fits doors 1-3/8 to 2 inches thick. For an entry function in the same drive-in style, the Deltana DLE23875 is the adjustable version, also for 1-3/8 to 2 inch doors.
6) What finishes is the Arrow 124 MK Series deadlatch available in?
Six finishes: 605 Bright Brass, 606 Satin Brass, 612 Satin Bronze, 613 Satin Bronze Oil-Rubbed, 625 Bright Chrome, and 626 Satin Chrome. Match the finish code to the MK Series trim already on the door so the exposed faceplate does not read off against the lever.
7) Is the Arrow 124 deadlatch UL Listed for use on a labeled door?
The 124 deadlatch carries a UL listing. That is the rating we hold on the part; on a labeled opening the complete lockset and door assembly also have to carry the label for the installation to stand.
8) What is a deadlatch and why would I replace just the latch instead of the whole lock?
A deadlatch has a small auxiliary plunger beside the latchbolt that deadlocks the bolt once the door closes, so the latch cannot be shimmed or carded open. When that mechanism wears and the door stops securing properly, swapping the latch restores the function without pulling the lever, cylinder, or keying. The Arrow 124 does that job on MK Series commercial locks.
9) Can I use the Arrow 124 latch on a residential Kwikset or Deltana knob?
No. It is a commercial part machined for Arrow MK Series chassis, and the tailpiece and latch case are not interchangeable with residential tubular locks. For a drive-in residential latch, the Deltana DLE23875 (entry) or DLP23875 (passage/privacy) suit doors 1-3/8 to 2 inches thick.
10) I manage a building with a lot of Arrow MK locks. Can I stock one latch for all of them?
Only for the 2-3/4 inch backset, square corner openings. That combination is the common commercial prep, so a single 124 in one finish often covers most of a floor, but any door prepped at 2-3/8 inch or with a radius-corner faceplate needs a different latch. Walk the doors and count by backset and corner style before you stock up.
11) Is the Kwikset 83518 or 83521 a substitute for the Arrow 124 deadlatch?
They are not interchangeable with the Arrow 124. The Kwikset 83518 is an RCAL adjustable square drive latch with a UL 3 hour rating, and the 83521 is an RCAL plain latch with a UL 3 hour rating for Kwikset BBL, KNL, CNL and PLL trim - both are tied to Kwikset lock families. The Arrow 124 is a UL Listed deadlatch dimensioned specifically for Arrow MK Series locksets at a 2-3/4 inch backset with a 2-1/4 inch by 1-1/8 inch square corner face. If the lock in the door is an Arrow MK, the 124 is the matching part.
12) Can I use the Arrow 124 on a pocket door privacy set?
No. The Arrow 124 is a commercial deadlatch for Arrow MK Series locksets in standard swinging door prep with a 2-3/4 inch backset. For a tubular pocket door privacy latch, the part built for that application is the Emtek 83228 faceplate and screws with square corners, in a privacy/bed/bath function. The square corner profile is the only thing the two share.
13) I want to move this opening to electrified access control - is there a latch for that instead of the Arrow 124?
The Arrow 124 is a mechanical deadlatch and a replacement component for Arrow MK Series locks; it has no electrical provision. If the opening is being converted to motorized operation, the Emtek LC9-DBLTCH is an EMPowered motorized deadbolt latch. Note that it is a deadbolt latch rather than a deadlatch for a lockset, so the door prep and the trim above it change with the switch.
How fast can I get the Arrow 124 26D 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 Arrow 124 26D come with a warranty?
Absolutely. The Arrow 124 26D 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 Arrow 124 26D?
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 Arrow 124 26D from ZenSupply?
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