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The Cal-Royal HD66 Heavy Duty Surface Overhead Stop is a premium-grade door control solution engineered for high-traffic, heavy-abuse environments. Designed with a robust slide track mechanism and a heavy shock absorber spring that compresses 5–7° before reaching the dead stop, this overhead stop ensures smooth and secure door operation. Ideal for both interior and exterior single-acting doors, the HD66 is non-handed and UL Listed for up to 3 hours (stop function only), meeting ANSI A156.8 standards. Its durable satin stainless steel finish (US32D) and complete installation kit—including thru-bolts, wood, and machine screws—make it a reliable and easy-to-install choice for commercial and institutional applications. Optimize your facility’s safety and performance with the trusted strength of Cal-Royal’s HD66 overhead stop.