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knock and lock door 

Overhead Door Corporation’s Knock & Lock® Breakaway Door System is the industry’s only self-resetting, impact-resistant dock door available. The rugged Knock & Lock® is designed for higher productivity, energy efficiency and costs 35% less than a complete breakaway door, making it the ideal choice for any dock environment. In addition, the Knock & Lock® Breakaway Door System offers a rugged, puncture-proof interior skin with a steel exterior for years of trouble-free service. Every panel is polystyrene insulated to 2 inches, providing an R-value of 8.56, and has dual slide locks on the bottom section for security.

Every Knock & Lock® Breakaway Door System is backed by an industry leading 10 year limited warranty. Whether the application requires a breakaway door system or simply breakaway sections for retrofit applications, the Knock & Lock® Breakaway Door System is the perfect solution for facility managers and architects alike.

Automatic reset

Single/Dual panel breakout

Breaks in and out

Available widths

8' 2", 9' 2", 10' 2", 12' 2", and 16' 2"*
*16' 2" only available in 21" height

Available heights

21" and 24"


8.56 (599=17.5)


Dual slide locks


10-year retractive cord
10-year puncture


2” rollers for smooth operations
3” rollers option for industrial areas

Ideal for new construction or retrofit