Simplify to: '4-1/2 x 4-1/2 National Hardware Hinge Spring for General Use'

Perfect for installation in hallways, entrances, and staircases, this device offers a hassle-free automatic door closing feature, serving as a viable alternative to traditional ceiling-mounted door closers. Embracing innovation, the patented ratchet mechanism conveniently eliminates the need for a separate adjustment locking pin, streamlining maintenance and ensuring seamless operation.

Compliant with the stringent NFPA 8 standard for three-hour fire-rated doors, it demands a minimum of two spring hinges per door for enhanced safety. Boasting UL certification, it's suitable for doors measuring up to 4 feet by 8 feet, accommodating weights of up to 180 pounds, guaranteeing robustness and stability.

Conforming to ANSI/BHMA Standard A156.17, Grade 1, this solution meets the highest industry standards for accessibility and durability, making it an ideal choice for high-traffic areas that prioritize functionality and safety.

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