Heavy-Duty 3.5mm Steel Sofa Bed Lift Mechanism & Folding Hinge

Commercial-grade spring-assisted sofa bed folding mechanism and parallel lift-up hinge engineered to convert compact living room sofas into flat sleeper beds. Designed specifically for upholstered furniture OEM manufacturers, convertible sofa factories, and global hardware wholesale distributors.

Manufactured by Zhaoqing Gaoyao Jinli Zhengkai Hardware Factory (BLS Hardware) in Jinli Town, Guangdong, China. Stamped from certified Q235 cold-rolled carbon steel featuring an engineered stepped-gauge profile: 3.5 mm heavy top plate, 3.0 mm middle scissor arms, and 2.5 mm base mounting rails, weighing 880 g (without spring) to eliminate lateral frame racking.

Key Specifications & Kinematics:

- Dimensions: 315 mm top width, 262 mm bottom width, 295 mm vertical lift height, 545 mm total deployed arm span, and an ultra-compact 10 mm folded profile height.

- Counterbalance System: High-tensile 65Mn helical extension springs absorb descending weight and provide effortless finger-light bed conversion.

- Quality & Compliance: Tested beyond 25,000 full-stroke articulation cycles in accordance with EN 12520 commercial furniture standards.