Arrow Lock MK31-BD-10B Grade 2 Communicating Knob Loc

Arrow MK31-BD-10B Grade 2 Communicating Knob Lock combines functionality with a sleek design, making it an excellent choice for commercial applications where heavy-duty hardware may not be required. Crafted with a double cylinder and a ball knob, this cylindrical lock features an oil-rubbed bronze finish that enhances both durability and aesthetic appeal. Designed for accessibility, the MK Series meets various requirements without compromising style. The lock chassis is constructed from cold-rolled steel with a zinc dichromate finish, providing superior corrosion resistance. It accommodates standard door thicknesses of 1-3/8" to 1-3/4" and requires a 2-1/8" bore through the door. The backset is available in standard sizes of 2-3/8" and 2-3/4", ensuring compatibility with multiple installations. The solid brass 6-pin cylinder is keyed to 5 pins for stock and can be masterkeyed, offering flexibility for various security needs. Its reversible handing allows for easy installation without the need for specific left or right configurations. With a UL listing for Grade 2 security and a 1-year limited warranty, the Arrow MK31-BD-10B is a reliable choice for professionals seeking quality and performance in door hardware.

Grade 2 Communicating Knob Loc

Grade 2 Double Cylinder Communicating Cylindrical Lock, Ball Knob, Conventional Cylinder, Oil-Rubbed Bronze Finish, Non-handed

Arrow MK Series offer the designer, architect and contractor simple solutions to accessibility requirements. Their clean designs, architectural finishes and available functions make them ideal for commercial applications where heavy duty grade one hardware may not be necessary.

The Arrow MK Series has a clear design and is a simple solution to accessibility requirements.

The MK Series is available in several finishes and functions that make them ideal for commercial applications where heavy duty grade one hardware may not be necessary.

• Lock Chassis – Cold rolled steel with zinc dichromate finish for corrosion resistance. Requires standard 2-1/8" (53.97mm) bore through door.
• Backset – 2-3/8" (60.32mm) standard. 2-3/4" (69.85mm), 3-3/4" (95.25mm) and 5" (127mm) available.
• Door Thickness – 1-3/8" (34.92mm) to 1-3/4" (44.45mm). Latch – Brass with 1/2" (12.7mm) throw.
• Latch housing is steel, with zinc dichromate finish for corrosion resistance. 7/8" (22.225mm) bore in edge of door is required.
• Latch Front – Brass, bronze or stainless steel. Standard faceplate for 2-3/8” (60.32.mm) backset measures 2-1/4” (57.15mm) x 1” (25.40mm) with a flat front, for 2-3/4” (69.85mm) backset standard faceplate measures 2-1/4” (57.15mm) x 1-1/8” (28.57mm) with beveled front 1/8” (3.17mm) in 2” (50.8mm). 
• Strike – Brass, bronze or stainless steel. Standard “T” strike measures 2-3/4" (69.85mm) x 1-1/8" (28.57mm). Optional ANSI A115.1 strike measures 4-7/8" (123.82mm) x 1-1/4" (31.75mm). All strikes have a 1-1/4" (31.75mm) lip to center dimension.
• Handing– Reversible.
• Cylinder, Standard – Solid brass 6 pin cylinder with Arrow “A” keyway, keyed to 5 pin for stock. Can be masterkeyed, grandmaster keyed and construction masterkeyed. Conventional cylinders are also available in a variety of competitive manufacturer’s keyways. Supplied with two 5 pin brass keys for stock. Available in Schlage CS keyway and other competitive keyways.

Resources

• MK Series Cut Sheet
• MK Series Dummy Knob Template
• MK Series Grade 2 Cylindrical Knob Locks Cut Sheet
• MK Series Template