Specifications include, but are not limited to: To supply forty eight (48) 30” diameter and two (2) 36” diameter cast iron manhole frames. Heavy Duty Manhole Frames and Covers: 1. Material: Cast Gray Iron (ASTM A48 Class 35-B) for heavy-duty use. 2. Catalog Number: R-1743-LM 3. Clear Open Area Diameter: 30 inches. 4. Frame Height: 6 inches. 5. Cover: Type “C” Solid Lid 6. Anchor Bolt Holes: (4) 1 inch diameter holes equally spaced on 36-7/8 inch diameter bolt circle. 7. Finish: All castings shall be manufactured true to pattern; component parts shall fit together in a satisfactory manner. They shall be of uniform quality; free from blowholes, porosity, hard spots, shrinkage distortion or other defects. They shall be well cleaned by blasting.
