A-A-50352C
2.2 Material. Clamps shall be constructed of steel of a quality to produce clamps conforming to the requirements as hereafter specified.
2.3 Rated capacity. The clamp, when used with various mobile and overhead cranes in lifting, turning and moving or transporting flat steel plate shall meet or exceed the rated capacity specified in table I.
2.4 Body or frame. The body or frame shall have jaws of unequal length, the shorter jaw being on the side opposite the cam grip in order to facilitate the entrance of steel plates between the jaws. The shorter jaw shall be recessed or other means shall be provided for a positive support of the gripping pad. The lever of the safety lock shall be located within the body or frame, or mounted externally. All other working parts, with the exception of the lifting shackle, shall be constructed within the body or frame.
2.5 Lifting shackle. The lifting shackle shall be constructed in such a manner that when a steel plate is lifted, it will hang in practically a vertical position directly under the crane hook or sling attachment. The minimum shackle opening shall be as specified in table I.
2.6 Cam grip. The plate gripping surfaces of the cam grips shall have serrations and shall be hardened to a minimum Rockwell "C" hardness reading of 50.
2.7 Gripping pad. The plate gripping surface of the gripping pad shall be serrated. The serrations shall be of a shape and depth to assure a positive grip. Means shall be provided to allow the pad to swivel (rotate) in any direction that contributes to alignment of the clamp with the direction of pull. The entire gripping pad or the serrations thereon shall be hardened to a minimum Rockwell "C" hardness reading of 50.
2.8 Safety lock. The safety lock mechanism shall be of such design that when the lever is in the lock-closed position, the cam grip shall be locked onto a steel plate both with and without tension being applied. Before a suspended steel plate is lowered to rest in an upright plate rack, the actuating lever is moved to a neutral position by the rigger. When the steel plate is lowered to
rest (causing a complete release of lifting tension), the actuating lever automatically moves to the lock-open position. In the lock-open position, the cam grip shall be locked in an open position. The clamp may then be raised from the steel plate. Means shall be provided for attachment of a pull cord to the lever.
2.9 Marking. The minimum rated capacity of each clamp shall be metal die stamped, engraved, or embossed in plain view on each clamp. Marking shall be legible at a distance of ten feet and shall remain legible throughout the life of the equipment.
2.10 Painting. Each clamp shall be painted with manufacturer's standard high-visibility paint in accordance with the manufacturer's standard practice.
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