Marshall Best Security

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.