The 4031 is a cast iron, universal closer designed specifically for doors in moderate traffic conditions. This versatile closer complements the rest of the heavy duty 4000 Series and offers the choice of three mountings and multiple arm options. Cast Iron, Forged Steel Main Arm, Heat Treated Steel Pinion, All Weather Fluid. UL and ULC listed for Self-closing doors without hold-open. Tested and certified under ANSI Standard A156.4, grade one. Non-sized (1-4) 4031 cylinder for exterior doors to 36” (914 mm) and interior doors to 48” (1219 mm). Closer mounts hinge side, top jamb, and parallel arm, on either right or left swinging doors. Closer meets ADA requirements. Standard powder coat finish. 4031 series closer shipped with Standard Metal Cover, Thru Bolt and Wood Machine Screws (TBWMS).