These are custom black oxide U bolts domestically manufactured for our machine and tooling component manufacturing customer at just 318 pieces.  7/16-14 thread was incorporated on each leg at 5/8" in length and the inside width was maintained at 5/8".  The inside length was 1-7/16.  Our internal part number for these u bolts is UB044023-F.

Larger quantities of these custom black oxide u bolts would be best supplied on a 12 month blanket purchase order basis.  The Blanket Order concept allows the customer to access the large quantity cost savings without paying upfront for the entire large quantity order. Instead we take on the burden of carrying the bulk inventory and only release the parts as needed, or often on a pre-scheduled basis provided by the customer.