Manufacturers of aluminum, rectangular bar and I-bar gratings and heavy weld steel gratings.Custom Aluminum Bar Grating, Stainless Steel Gratings - Ohio Gratings, Inc. Search: GM Riverfront project Since 1970, Ohio Gratings, Inc. has manufactured one quality product, bar grating . This single focus has allowed us to become a market leader in the aluminum and steel bar grating industry. Our Motto “Make It Right and Ship When Promised” has defined us over the last 35 years. Ohio Gratings, Inc. manufactures a wide variety of pressure locked bar grating : dove tail, swaged and flush to