These are 1/2 diameter custom square u bolts we supplied to a construction company in urgent need, at small quantity of just 6 pieces.  With a rush service we were able to ship these custom parts within 4 days from order confirmation.  They incorporate approximately 4 inches of 1/2-13 thread, with the inside width at 4-1/2 inches and inside depth at 18 inches.  Material certs and stainless steel hex nuts were supplied as well per the customer's request.  Our internal part number for these custom square u bolts is USB050288-I.

Large quantities of these custom square 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.