The LCN 4021-3071 Standard Cylinder Assembly is a cast iron component associated with the LCN 4021 Series Smoothee surface-mounted door closers. This assembly is identified as a standard cylinder configuration, distinct from other cylinder assembly variants.

We are your trusted source for genuine OEM replacement parts, commercial door hardware, electronic access control products, and life safety hardware.

Manufacturer: LCN
Part Number: 4021-3071
Product Name: Standard Cylinder Assembly
Material: Cast iron
Primary Function: Door closer cylinder assembly
Application: Commercial LCN 4021 surface-mounted door closer
OEM Part: Yes

Warranty

• 15 to 30 years — Mechanical door closers: LCN mechanical door closers carry warranty periods ranging from 15 to 30 years, depending on the product series. The warranty period is 30 years for the 4000 and 1460 Series, 25 years for the 4050 and 1450 Series, 20 years for the 1260 Series, and 15 years for the 1250 Series. Other product categories may have different warranty terms.
• 2 years — Electromechanical products: LCN automatic operators, specified control boxes, fire/life safety closer-holder systems (SE, ME, HSA and SEH Series), SEM magnets, and applicable electronic accessories carry a two-year warranty where covered under the applicable warranty terms.
• Access control products: LCN primarily manufactures door closers, automatic operators, and related door-control hardware rather than standalone access-control locking systems. Access-control locks and related products may be offered under other Allegion brands and are subject to their respective warranty terms.