This SAE Standard applies to upper coupler kingpins for commercial trailers and semitrailers in the unladen condition. See
Figure 1
. A 90 degree ± 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 inch) radius. The upper coupler plate surface should not bow downward (convex) more than 0.635 cm (1/4 inch) within a 48.26 cm (19 inch) radius or more than 0.3175 cm (1/8 inch) at a radius of 25.4 cm (10 inches) from the kingpin. The upper coupler plate surface should not bow upward (concave) more than 0.15875 cm (1/16 inch) within a 48.26 cm (19 inch) radius. (See
Figure 2
.)
| SDO | SAE: SAE International |
| Document Number | J700 |
| Publication Date | Nov. 12, 2020 |
| Language | en - English |
| Page Count | 3 |
| Revision Level | 202011 |
| Supercedes | |
| Committee |