Specifications Gray Iron 1. Castings shall be manufactured with a minimum tensile strength of 35,000 p.s.i. This is in accordance with ASTM Specification A-48-83, Class 35B for gray iron. Through alloying higher tensile strengths can be produced when required. FINISHED CASTINGS 1. Castings will be manufactured true to pattern within foundry limits. Published dimensions shall not deviate by +/- 1/16" per foot. 2. All casting weights shown are averages. Published weights shall not deviate by +/- 5 percent. 3. Castings shall be free of defects such as porosity, rough surfaces and shrinkage. All castings shall be cleaned by shotblasting. 4. All round castings of heavy-duty design shall be furnished with machined horizontal bearing surfaces. 5. All castings are furnished unpainted. Castings can be furnished with one coat of standard asphalt base paint. Please specify coating requirements when ordering. TRAFFIC LOADS 1. Heavy duty - For highway and street traffic. Suitable for H-20 load requirements of 16,00 lbs. Many castings are produced for much heavier traffic. 2. Medium Duty - For light traffic areas. Wheel loads not exceeding 2000 lbs. 3. Light Duty - For non-traffic areas. If required, proof load tests will be provided on any of the castings in the following pages. Proof load strength tests are performed in accordance with Fed. Spec. RR-F-621c.