Swivel hoist rings were developed to overcome the deficiencies of eyebolts as a result of angular loading. Unlike eyebolts, the hoist ring design provides the ability to pivot 180° and swivel 360° to compensate for load pitch, roll, or sway when lifting unbalanced loads. ADB is the originator of the safety-engineered hoist ring and has been providing reliability since 1964. ADB hoist ring CAD models are readily available at www.adbhoistrings.com, and our knowledgeable staff of engineers can be consulted for customizations or technical questions.
ADB hoist rings have been designed and tested to meet ASME B30.26-2 user specification requirements. Design requirements include proper working load limit and fastener torque markings, a 5:1 design factor, specific length thread projections, and suitable materials to meet the product specifications. While proof testing is not a requirement for newly manufactured hoist rings, ADB proof tests to 200% each center-pull style hoist ring with a working load limit up to 30,000 lbs. before shipment (150% for stainless steel).
ADB hoist rings can be properly installed using a tapped or “through” hole with an ADB approved nut and washer attached on the opposite side. When installed properly, all ADB swivel hoist rings freely swivel 360° and pivot 180°. Although hoist ring working load limits do not change or have to be reduced during angular loading, be aware that angular loading does increase the load on all components in the rigging configuration including the hoist ring. It is the responsibility of the user to understand and take into consideration the additional loads being applied as a result of angular loading.