Specifications include, but are not limited to: 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
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.