Marks USA MAR145K 145K Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch

Marks USA 145K Single Cylinder Deadbolt with Grade 1 Defender Cylindrical Cartridge Deadlatch

The Marks USA 145K is a commercial-grade single cylinder deadbolt featuring a Series 1 cylindrical cartridge design that installs easily and accepts most manufacturers' conventional, high security, and IC core cylinders. Rated ANSI 156.5 Grade 1, the deadlatch carries a UL fire rating of 3 hours, while the deadbolt meets ANSI 156.5 Grade 1 standards. Designed for 1-3/4" door thickness with a 2-3/4" backset and a 9/16" latch throw, the 145K delivers robust security for demanding commercial applications. Unitized assemblies are engineered for a 2-1/8" bore, and spacer rings K1442/32D are available for use with 1-3/8" doors.

Key Features

• ANSI 156.5 Grade 1 Rated: Both the deadbolt and deadlatch meet ANSI 156.5 Grade 1 standards, ensuring top-tier performance for commercial door security applications.
• UL Fire Rated Deadlatch: The deadlatch is UL fire rated for 3 hours, providing critical compliance for fire-rated door assemblies in commercial buildings.
• Broad Cylinder Compatibility: Accepts Medeco, Kaba, Multilock, ASSA, and other high security cylinders, as well as most manufacturers' conventional cylinders and IC core models for "Best" size cores.
• Unitized Assembly for 2-1/8" Bore: Designed for straightforward installation in standard 2-1/8" bore preparations; spacer rings K1442/32D allow use on 1-3/8" doors.
• 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: An integrated steel shutter system eliminates access to mounting screws when the door is locked, protecting against tampering and unauthorized removal.
• Multiple Function Options: Available in six functions — K (Cylinder x Turnpiece), L (Communicating Single Cylinder), M (Double Cylinder), KL (Cylinder x Lever), X (Turnpiece x Blank Plate), and KK (Cylinder x Knob) — for versatile application configurations.
• Multiple Finish Options: Available in Bright Brass (3), Stainless Steel (32D), Dark Bronze (10B), and Satin Chrome (26D) to complement a wide range of architectural aesthetics.

Certifications & Compliance

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

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 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 145K?

Marks USA 145K deadbolts are engineered for professional-grade security with tapered cylinder collars that resist wrenching attacks and a steel shutter system that conceals mounting screws when locked. With ANSI 156.5 Grade 1 certification, a 3-hour UL fire rating on the deadlatch, and broad compatibility with high security cylinders from Medeco, Kaba, Multilock, and ASSA, the 145K is a dependable choice for commercial door security where performance and versatility are essential.