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

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.