Marks USA MAR145KL 145KL Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch — Cylinder x Lever

Marks USA 145KL Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch — Cylinder x Lever

The Marks USA 145KL is a commercial-grade single cylinder deadbolt featuring a Grade 1 Defender cylindrical cartridge deadlatch in a Cylinder x Lever (KL) function configuration. Designed for 1-3/4" door thickness (with spacer rings K1442/32D available for 1-3/8" doors), this unitized assembly installs into a standard 2-1/8" bore and delivers a 9/16" throw latch with a 2-3/4" backset. Constructed with stainless steel components, the 145KL accepts Medeco, Kaba, Multilock, ASSA, and most other manufacturers' conventional, high security, and IC core cylinders, making it an exceptionally versatile solution for commercial door security applications.

Key Features

• ANSI Grade 1 Deadlatch: Deadlatch meets ANSI 156.5 Grade 1 standards and is UL fire rated for 3 hours, ensuring compliance in demanding commercial and fire-rated door applications.
• ANSI Grade 1 Deadbolt: Deadbolt meets ANSI 156.5 Grade 1 standards (UL fire ratings not applicable to deadbolt function) for high-security performance.
• Door Thickness Compatibility: Designed for 1-3/4" doors; compatible with 1-3/8" doors using spacer rings K1442/32D for flexible installation across door types.
• Unitized Assembly for 2-1/8" Bore: Streamlined unitized design installs into a standard 2-1/8" bore for straightforward retrofits and new installations.
• Broad Cylinder Compatibility: Accepts Medeco, Kaba, Multilock, ASSA, and most other manufacturers' conventional cylinders, as well as IC core models for "Best" size cores, providing maximum keying flexibility.
• Tapered Cylinder Collars: Tapered cylinder collars prevent break-in attempts by wrenching, adding a critical layer of physical security to the installation.
• Steel Shutter System: Integrated steel shutter system eliminates access to mounting screws when the door is locked, protecting against tampering and unauthorized removal.
• Series 1 Cylindrical Cartridge: Features a Series 1 cylindrical cartridge design for reliable, consistent deadlatch operation in high-traffic commercial environments.
• Marks "C" Keyway Cylinder: Supplied with a Marks "C" keyway, 6-pin cylinder and 2 keys for immediate out-of-box functionality.

Certifications & Compliance

• ANSI 156.5 Grade 1 — Deadlatch
• ANSI 156.5 Grade 1 — Deadbolt
• UL Fire Rated 3 Hours — Deadlatch

Technical Specifications

• Latch Front: 1" x 2-1/4"
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Subcategory: Cylindrical Locks
• Commercial/Residential: Commercial
• Keyed: Yes
• Product Function: Cylinder x Thumbturn
• Latch Type Specification: Deadlocking
• Keyway Profile: Marks C
• Product Material: Stainless Steel
• Product Category: Mechanical Locks
• 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 Marks USA 145KL?

Marks USA 145KL deadbolt products are engineered with stainless steel construction, tapered cylinder collars, and a steel shutter system that together deliver professional-grade physical security for commercial door applications. The ANSI 156.5 Grade 1 rating on both the deadbolt and deadlatch — combined with a 3-hour UL fire rating on the deadlatch — confirms this lock meets the rigorous performance standards required for high-traffic, code-compliant commercial installations.