Unless otherwise specified on the part number drawing or material specification, tensile test specimens shall be selected according to Figure 3 for all cast iron types. The gage length for determining elongation for ductile and compacted graphite iron is 4X the reduced section diameter. This gage length may be reduced for testing gray irons only. 1E0552 provides standard Caterpillar test specimen dimensions and allowance for comparable international test specimens. Specimens shall be taken as near the surface of the casting as possible, locating the centerline of the casting section. (See Figure 4).