Marshall Best Security MB1CA-3-01-15-626-ISO Grade 1 Entry Lever With Clutch offers exceptional durability and reliability, making it one of the most formidable options in the grade 1 lever cylindrical lock category. Crafted for demanding environments, this heavy-duty lockset is ideal for industrial, military, educational, and commercial applications. The MB1 features a robust chassis and through-bolt trim, available in various lever styles, ensuring both aesthetic appeal and functional strength. Its strong cast and machined stainless steel hubs, combined with heavy-duty return springs, provide resistance to lever sag and extend the product's lifespan. Tested to exceed 4,000,000 cycles, this lock surpasses ANSI standards for grade 1 cylindrical locks. Designed for versatility, it accommodates door thicknesses from 1-3/8" to 2" and offers multiple backset options, including 2-3/4" as standard. The 1/2" throw deadlatch is UL listed, ensuring safety and security. The non-handed design simplifies installation, while solid zinc diecast levers and wrought brass roses provide additional strength and style. Available in a variety of finishes, including satin chrome, the MB1CA-3-01-15-626-ISO is also masterkeyed and compatible with Best and Falcon cores, making it a smart choice for any security solution.

+Grade 1 Entry Lever With Clutch

The MB1 heavy-duty cylindrical lockset is one of the most formidable grade 1 lever cylindrical available. Designed for rugged reliability and long-lasting performance, it is ideally suited for industrial, military, educational and commercial use. The MBK1 is a robust grade 1 knob cylindrical designed for rugged reliability and long-lasting performance and is commonly used in military and government facilities.

Features:

• Heavy duty chassis, through bolt trim with various lever styles available.
• Strong cast and machined stainless steel hubs.
• Heavy duty return springs provide resistance to lever sag.
• Tested to over 4,000,000 cycles which exceeds the ANSI standard for grade 1 cylindrical locks.
• Heavier rose liner material provides greater attack resistance.
• Heat treated, heavy gauge cold rolled steel allows 1000 inch-pounds of torque to be applied to the locked lever without allowing access.
• Treaded inside and outside rose assembly adjustable for door thickness without removing keyed lever.
• Exceeds grade 1 abusive locked lever torque.

Specifications:

• Door Thickness: 1-3/8" to 2" wood or metal door standard, 2-1/4" is available.
• Backset: 2-3/4" standard; 2-3/8", 3-3/4" and 5: optional.
• Latchbolt: 1/2" throw deadlatch, UL listed, self-adjusting faceplate; 3/4" throw fire door deadlatch available.
• Handing: Non-handed.
• Strike: S1 ANSI strike standard, S2 T strike optional.
• Lever Handles: Solid zinc diecast levers, wrought brass roses, concealed screws. I/C core version standard.
• Door Preparation: ANSI A115.2, through bolt installation.
• Interchangeable Core(Standard): 6 or 7 pin with nickel silver keys, compatible with Best and Falcon cores.
• Masterkeyed: Can be masterkeyed or grand masterkeyed and construction key systems available.
• Finishes: 605, 606, 612, 613, 625 and 626.

Resources

• Cut Sheet