Anti-two-block (ATB or A2B) warning systems are used to warn or prevent the crane operator from two-blocking the crane.

Two-blocking is a dangerous condition where the hook block is raised until it contacts the boom tip. 

Two-blocking is dangerous to personnel and can cause expensive damage to crane booms and equipment.  

Anti-Two-Block warning systems are the most basic operator aide every crane should have.  We offer ATB systems to fit every type of crane and application.

Anti-Two Block Systems

  • R147 ATB

    R147 ATB Wireless Anti-Two-Block Warning System

  • R140

    R140 Wired Anti-Two Block Warning System

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Crane Warning Systems Atlanta

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6175 Hickory Flat Hwy

Suite 110-376

Canton, GA 30115

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