Corbin Russwin DL4122 Grade 1 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$703.56
$403.64
Corbin Russwin DL4122 Grade 1 Mortise Deadlock, Double Cylinder x Thumbturn

Corbin Russwin DL4122 Grade 1 Mortise Deadlock, Double Cylinder x Thumbturn

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Model: DL4122 626
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$703.56
$403.64
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Corbin Russwin DL4122-KEYED Mortise Deadlock Double Cylinder with Thumbturn, Non-Handed Commercial Security Lock

Commercial-Grade Mortise Deadlock with Double Cylinder Function for Maximum Security

The Corbin Russwin DL4122-KEYED is a professional-grade mortise deadlock from the DL4100 Series, engineered for demanding commercial applications requiring key access from both sides of the door. This double cylinder mortise deadlock features a heavy wrought steel lockcase with zinc dichromate finish and a steel deadbolt with hardened pin delivering a full 1" (25mm) throw for superior security. Designed for standard door thicknesses of 1-3/4" (44mm) with optional thicknesses available, and a standard backset of 2-3/4" (70mm), this non-handed lock installs on any door orientation. The front plate measures 4-5/8" (117mm) x 1-1/8" (29mm) and is available in brass, bronze, or stainless steel, with adjustability for flat or beveled doors with a bevel adjustment of 1/8" (3mm) in 2" (51mm).

Professional Features & Benefits

  • Door Thickness Compatibility: Standard 1-3/4" (44mm) door thickness with optional thicknesses available via Quick Codes, accommodating a range of 1-3/4" to 2-1/4" for versatile commercial installations.
  • Standard Backset: 2-3/4" (70mm) backset ensures compatibility with standard commercial door preparations for straightforward installation.
  • Heavy-Duty Deadbolt: Steel deadbolt with hardened pin and 1" (25mm) throw provides robust resistance to forced entry in high-security commercial environments.
  • Double Cylinder Function: Operated by key from either side and by thumbturn from inside; thumbturn will retract but not project the deadbolt, providing controlled access and egress security.
  • Heavy-Duty Lockcase Construction: Heavy wrought steel lockcase with zinc dichromate finish delivers long-term durability and corrosion resistance for commercial-grade performance.
  • Versatile Front Plate Options: Available in brass, bronze, and stainless steel; front measures 4-5/8" (117mm) x 1-1/8" (29mm) and is adjustable for flat or beveled doors with 1/8" (3mm) bevel adjustment in 2" (51mm).
  • Standard Strike Included: Wrought brass or bronze strike measuring 3-1/2" (89mm) x 1-1/8" (29mm) included; optional strikes also available for varied frame conditions.
  • Conventional 6-Pin Cylinder: Brass, 6-pin cylinder with L4 keyway, 0-bitted as standard; includes two nickel silver keys. Security cylinders and interchangeable core (IC) options available via Quick Codes.
  • Extensive Keying Options: Supports master keying, construction master keying, 7-pin (FC) conventional, interchangeable core (IC), security, visual key control, concealed key control, pyramid (FC), and pyramid (IC) configurations.
  • Non-Handed Design: Installs on left- or right-hand doors without modification, simplifying specification and inventory management.
  • Manufacturer Warranty: One-year limited warranty for added confidence and protection.

Technical Specifications

  • Subcategory: Deadlocks
  • Product Group: Mechanical Locks
  • Series: DL4100 Series
  • Keyed Function: Double Cylinder
  • Standard Cylinder: Conventional 6-pin Cylinder, L4 Keyway
  • Standard Latch: Deadbolt: Steel with hardened pin, 1" Throw
  • Standard Strike: 3-1/2" x 1-1/8"
  • Warranty: 1 Year Limited
  • Product Subgroup: Mortise Locks and Trim
  • Product Type: Mortise Deadlocks
  • Keyed: Yes
  • Commercial/Residential: Commercial
  • Function Description: By key either side and by thumbturn inside. Thumbturn will retract but not project deadbolt.
  • Lock Type: Mortise
  • Lock Function: Double Cylinder
  • Product Model: DL4122
  • Product Function: Double Cylinder
  • Door Hand Direction: Non-Handed
  • Door Thickness Range: 1-3/4" to 2-1/4"
  • Product Category: Mechanical Locks
  • Backset (Distance): 2-3/4"
  • Department: Door Hardware

Professional Applications

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

Why Choose Corbin Russwin Quality?

Corbin Russwin mortise deadlock products deliver professional-grade reliability with heavy wrought steel lockcase construction, zinc dichromate finish, and a steel deadbolt with hardened pin rated for a full 1" (25mm) throw. The DL4100 Series supports an extensive range of keying configurations including master keying, interchangeable core, and security options, backed by a one-year limited warranty. Engineered for demanding commercial applications where dependable access control and long-term durability are essential.

Manufacturer Resources

Corbin Russwin Condensed Catalog

Product Specs

Subcategory:
Deadlocks
Product Group:
Mechanical Locks
Series:
DL4100 Series
Keyed Function:
Double Cylinder
Standard Cylinder:
Conventional 6-pin Cylinder, L4 Keyway
Standard Latch:
Deadbolt: Steel with hardened pin, 1" Throw
Standard Strike:
3-1/2" x 1-1/8"
Warranty:
1 Year Limited
Product Subgroup:
Mortise Locks and Trim
Product Type:
Mortise Deadlocks
Keyed:
Yes
Commercial/Residential:
Commercial
Function Description:
By key either side and by thumbturn inside. Thumbturn will retract but not project deadbolt.
Lock Type:
Mortise
Lock Function:
Double Cylinder
Product Model:
DL4122
Product Function:
Double Cylinder
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4" to 2-1/4"
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Corbin Russwin DL4122 626 – Frequently Asked Questions

1) Will the Corbin Russwin DL4122 mortise deadlock fit a 1-3/4 inch commercial door?
Yes, 1-3/4 inches is the standard thickness for the DL4122, and the lock covers 1-3/4 inch through 2-1/4 inch doors. The backset is 2-3/4 inches, the standard commercial mortise prep, so on a door already mortised for a Corbin Russwin case the pocket and cylinder centerline line up. Doors thicker than 1-3/4 inches need the thickness specified at order time so the cylinder lengths and trim come out right.
2) Does the DL4122 deadlock have to be ordered left hand or right hand?
No handing to specify. The DL4122 is non-handed and goes into a left-hand or right-hand door without modification, which is why it is an easy part to stock across a building where the openings swing both ways. The front is also adjustable for flat or beveled doors, with 1/8 inch of bevel adjustment in 2 inches.
3) What does the double cylinder function on the DL4122 actually do at the door?
Key operates the deadbolt from either side, and a thumbturn inside can retract the bolt but cannot throw it. So someone inside can always get out by turning the thumbturn, but they cannot lock the door from the inside without a key. That is the distinction to check against your code official before putting a double cylinder deadlock on an egress door, because a true double cylinder with a key inside and no turn is what most codes restrict.
4) Will the DL4122 deadbolt engage my existing mortise strike?
The bolt is steel with a hardened pin and throws a full 1 inch, and the deadlock ships with a 3-1/2 x 1-1/8 inch strike. If the frame is already cut for a standard Corbin Russwin mortise strike of that size, the supplied one drops in. A 1 inch throw needs a strike box deep enough to take it, so on an older or field-modified frame plan to chisel the pocket rather than assume the existing box is deep enough. Optional strikes are available for other frame conditions.
5) Can I order the DL4122 to match my existing Corbin Russwin master key system?
Yes. The standard build is a brass 6-pin conventional cylinder in the L4 keyway, 0-bitted with two nickel silver keys, and the DL4100 Series supports master keying, construction master keying, 7-pin FC conventional, security cylinders, visual and concealed key control, and pyramid keying. If your system is not L4, specify your keyway rather than taking the 0-bitted standard, because a 0-bitted cylinder arrives unkeyed and has to be pinned to your system anyway.
6) I use small format interchangeable cores. Which DL4122 cylinder option should I order?
Order one of the less-core versions and drop your own cores in. CL6 is less core for a Corbin Russwin large format IC 6-pin, CL7 is a 7-pin IC less core, and LC is less conventional cylinder if you are supplying your own standard mortise cylinders. The fourth choice is the factory conventional 6-pin L4 cylinder if you want the lock to arrive complete. Cores are not included on any of the less-core options.
7) What finishes does the Corbin Russwin DL4122 deadlock come in?
Six: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil-rubbed satin bronze, 625 bright chrome, and 626 satin chrome, plus BSP black suede powder coat. On a building already standardized in 626, that is the one that matches most commercial lever and exit hardware. Every finish is available with any of the four cylinder options, so you are not forced into a finish to get IC prep.
8) Should I use a mortise deadlock like the DL4122 or a tubular deadbolt on a commercial door?
A mortise deadlock goes in a pocket routed into the edge of the door rather than through a pair of bored holes, so it is the right choice where the door is already prepped for a mortise case or where the spec calls for mortise hardware. The DL4122 is a commercial-rated mortise unit with a 2-3/4 inch backset and a 1 inch steel bolt. If your door has a 161 bored prep and no mortise pocket, a mortise deadlock is the wrong part, you want a bored deadbolt instead, because retrofitting a mortise pocket into a bored door is a routing job, not a swap.
9) Can the DL4122 be added above an existing mortise lockset on the same door?
The DL4122 is a deadlock only, it carries a bolt and no latch or lever trim, so it is used as a standalone auxiliary lock on a door that already has its handle set or exit device. It needs its own mortise pocket at the 2-3/4 inch backset and its own strike cutout in the frame, above or below the existing case. It will not replace a mortise lockset on its own, since nothing on it retracts a latch for normal day-to-day use.
10) What size is the DL4122 front plate and what material can I get it in?
The front measures 4-5/8 x 1-1/8 inches and comes in brass, bronze, or stainless steel. It adjusts for flat or beveled doors with 1/8 inch of bevel in 2 inches. If you are matching an existing mortise cutout in the door edge, that 4-5/8 by 1-1/8 face is the dimension to check against the old front before you order.
11) Is the DL4122 deadlock built for high traffic institutional use?
It is a commercial unit with a heavy wrought steel lockcase in a zinc dichromate finish and a steel bolt with a hardened pin, aimed at offices, schools, healthcare, retail, government buildings, multi-tenant residential, and warehouses. The hardened pin in the bolt is the anti-saw feature, which is what matters on a perimeter or storage door where the bolt is exposed in the gap between door and frame.
How fast can I get the Corbin Russwin DL4122 626 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 Corbin Russwin DL4122 626 come with a warranty?
Absolutely. The Corbin Russwin DL4122 626 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 Corbin Russwin DL4122 626?
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 Corbin Russwin DL4122 626 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.

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