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.  Without a proper crane A2B system, a two-block can cause expensive damage to the crane boom, personnel and surrounding property. 

Anti-Two-Block warning systems are the most basic operator aide every crane should have.  We offer reliable RaycoWylie brand wireless and hardwired ATB systems to fit every type of crane and application.  The RaycoWylie model R147 and model R140 Anti two-block (ATB or A2B) warning systems have a superior design with a long history of proven performance and reliability.  Call or Click to order yours today!   

Anti Two Block Systems

  • R147 A2B

    R147 ATB Wireless Anti Two-Block Warning System

  • R140 A2B

    R140 ATB 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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