Seco-Larm SD-C131-SQ Grade 1 Door Closer

Fixed Size 3 Commercial Door Closer for Metal and Wood Doors

The Seco-Larm SD-C131-SQ is a heavy-duty Grade 1 surface-mounted door closer for commercial metal and wood doors weighing up to 140 pounds. Its fixed Size 3 closing force is intended for doors up to 42 inches wide, providing controlled automatic closing without the spring-force adjustment required on variable-size models.

Two independent valves allow installers to set the sweep speed and latch speed separately. Sweep adjustment controls the main closing movement, while the latch valve regulates the final 15 degrees of travel so the door can close firmly enough to engage the latch without slamming.

The reversible, non-handed design supports left- or right-hand door installations. Included hardware allows regular-arm or top-jamb mounting, making the SD-C131-SQ suitable for commercial entrances, offices, utility rooms, controlled-access openings, and other frequently used doors that fall within its Size 3 capacity.

Its cast-aluminum body, forged-steel arm, and silver finish are designed for commercial service. The closer is certified to ANSI 156.4 Grade 1 requirements for 2 million cycles and carries a five-year manufacturer warranty.

Key Features

• Heavy-duty Grade 1 surface-mounted commercial door closer
• Fixed Size 3 closing force
• Designed for metal or wood doors up to 42 in. wide
• Supports door weights up to 140 lb.
• Separate sweep-speed and latch-speed adjustments
• Latch-speed control covers the final 15° of closing travel
• Reversible, non-handed design for left- or right-hand doors
• Supports regular-arm and top-jamb installation
• Cast-aluminum closer body
• Forged-steel arm assembly
• Silver finish
• Maximum hinge-side opening angle of 120°
• ANSI 156.4 certified for 2 million cycles
• UL listed
• Installation hardware included
• Five-year manufacturer warranty

Technical Specifications

• Manufacturer: SECO-LARM
• Brand: ENFORCER
• Model / Part Number: SD-C131-SQ
• Product Type: Surface-mounted hydraulic door closer
• Commercial Grade: Grade 1
• Certification: ANSI 156.4
• Cycle Rating: 2 million cycles
• UL Listing: Yes
• Closing Force: Fixed Size 3
• Closing-Force Adjustment: Not adjustable
• Sweep Speed: Adjustable
• Latch Speed: Adjustable
• Latch Range: Approximately 15° to 0°
• Back Check: No
• Adjustment Valves: One sweep valve and one latch valve
• Handing: Reversible, non-handed design
• Maximum Door Width: 42 in. (1,070 mm)
• Maximum Door Weight: 140 lb. (65 kg)
• Compatible Door Materials: Metal or wood
• Maximum Hinge-Side Opening: 120°
• Installation Configurations: Regular arm or top jamb
• Parallel-Arm Installation: Not listed
• Body Construction: Cast aluminum
• Arm Construction: Forged steel
• Finish: Silver
• Mounting Footprint: Approximately 6-9/16 x 3/4 in. (166 x 19 mm)
• Closer Body Length: Approximately 5-1/2 in. (140 mm)
• Closer Body Height: Approximately 2-5/16 in. (58 mm)
• Product Weight: Approximately 3 lb. (1.36 kg)
• Included Components: Door closer, forged-steel arm assembly, and installation hardware
• Warranty: Five years
• Installation Note: Sweep and latch speeds should be adjusted for the door, frame, latch hardware, and site conditions

Conclusion

The Seco-Larm SD-C131-SQ is a fixed Size 3 door closer for commercial metal or wood doors within its 42-inch and 140-pound limits. Its independent sweep and latch adjustments provide control over the main closing cycle and final latching movement, while its non-handed design supports regular-arm or top-jamb installations.