標準號：SAE J 700-2011
中文標準名稱：聯結器中心立軸在上部的商用掛車和半掛車
英文標準名稱：Upper Coupler Kingpin Commercial Trailers and Semitrailers
標準類型：T21
發布日期：2011/7/14 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：T21
國際標準分類號：43.040.70;43.080.10
引用標準：SAE J 133-2011
適用范圍：This SAE Standard applies to upper coupler kingpins for commercial trailers and semitrailers in the unladen condition. A 90 ± 1 degree angle extends (in all directions) from the centerline of the kingpin to the upper coupler plate surface within a 48.26 cm (19 in) radius. The upper coupler plate surface should not bow downward (convex) more than 0.635 cm (1/4 in) within a 48.26 cm (19 in) radius or more than 0.3175 cm (1/8 in) at a radius of 25.4 cm (10 in) from the kingpin. The upper coupler plate surface should not bow upward (concave) more than 0.15875 cm (1/16 in) within a 48.26 cm (19 in) radius.