เหล็กกล่องแบน (Rectangular Steel Tubes)

ขนาด (นิ้ว)              ขนาด OD (มม.)              ความหนา (มม.)

11/2”x3/4”                  38×19                         1.2-2.3

2”x1”                            50×25                         1.2-3.2

3”x11/2”                      75×38                         1.2-3.2

4”x2”                            100×50                       1.2-3.2

5”x2”                            125×50                       1.8-3.2

6”x2”                            150×50                       1.8-3.2