備注: 1、承插壁厚外圍平均值不低于所列值,最小值于局部區域。 2、每種規格的上下值分別代表、最小尺寸。 Note: 1、Average of socket wall thickness around periphery shall be no less than listed values. The minimum values are permitted in localized areas. 2、Upper and lower values for each size are the respective maximum and minimum dimensions.