This retainer plate detail features a 3/8-inch thick steel plate measuring 10 inches by 8 inches with clipped corners. The plate is detailed with four holes for 1/2-inch diameter bolts, arranged in a standard pattern with 2-1/2 inch horizontal spacing and 7-3/8 inch vertical spacing. A structural channel or similar section is embedded into a slotted cutout in the plate, secured with 3/16-inch typical fillet welds. Overall dimensions establish edge distances of 1-3/4 inches horizontally and 15/16 inches vertically to the bolt centers.
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