Corbin Russwin CK4355 GRD 630 Grade 1 Classroom Lock

Corbin Russwin CK4355 GRD 630 Grade 1 Classroom Lock is engineered for high-performance in demanding environments, making it an excellent choice for schools, hospitals, and various commercial applications. This Grade 1 cylindrical lock features a durable global knob design and is constructed with a conventional cylinder, ensuring reliability and longevity. The CK4300 Series is designed to withstand the rigors of frequent use, equipped with heavy wrought knobs reinforced with steel for enhanced impact resistance. It is non-handed, accommodating a range of door thicknesses from 1-3/8" to 2", and includes a standard 2-3/4" backset for versatile installation. This lock boasts a satin stainless steel finish (630/US32D), giving it a modern and professional appearance while ensuring corrosion resistance. The 6-pin brass cylinder with an L4 keyway adds a layer of security, while the stainless steel latchbolt features a 1/2" throw for reliable locking. With a fire rating of 3 hours and UL listing under ANSI A156.2, Series 4000, Grade 1, the CK4355 guarantees safety and performance in critical settings. Backed by a 3-year limited warranty, this lock exemplifies quality and durability for commercial use.

Grade 1 Classroom Lock

Grade 1 Classroom Cylindrical Lock, Global Knob, Conventional Cylinder, Satin Stainless Steel Finish, Non-handed

The CK4300 Series is ideal for demanding, high-use commercial, industrial and institutional applications, including, Schools, Hotels, Hospitals and Nursing Homes, Churches, Municipal Buildings, Airports, Retail complexes, Offices and Warehouses.

A traditional knob with ANSI/BHMA Grade 1 reliability and durability.

The CK4300 Series is ideal for demanding, high-use commercial, industrial and institutional applications. It's heavy wrought knobs are lined with steel for impact resistance. 

• Handing Non-handed.
• Door Thickness 1-3/8" (35mm) – 2" (51mm).
• Backset 2-3/4" (70mm) standard.
• Lock Chassis Steel, zinc dichromated for corrosion resistance.
• Front Wrought brass or stainless steel, 2-1/4" (57mm) x 1-1/8" (29mm). Accommodates doors beveled 1/8" (3mm) in 2" (51mm).
• Latchbolt Stainless Steel 1/2" (13mm) throw, 7/8" (22mm) diameter.
• Strike Wrought brass or stainless steel, ANSI curved lip standard, 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/4" (32mm) lip to center. Optional strikes, lip lengths and ANSI wrought strike box available
• Cylinder Brass, 6-pin, L4 keyway, 0-bitted standard.

Resources

• CK4300 Dummy Trim Installation Instructions
• CK4300 Installation Instructions
• CK4300 Series Cylindrical Lock Catalog
• CK4300 Series Grade 1 Cylindrical Knob Locks  Cut Sheet