Common Specifications of the Square Tubes：
500＊500＊8~25 140＊140＊4~14
135＊135＊4~14                                                                                                       
130＊130＊4~12                                                     
450＊450＊8~25 120＊120＊4~12
400＊400＊8~25 110＊110＊4~12
350＊350＊8~25 100＊100＊4~12
300＊300＊8~25 80＊80＊4~12
280＊280＊8~25 60＊60＊4~12
250＊250＊8~25 50＊50＊4~12
220＊220＊8~25 40＊40＊4~10
200＊200＊8~25 30＊30＊2~6
180＊180＊7~20 20＊20＊2~4
160＊160＊5~16
150＊150＊5~14

1. Standard of cold-formed hollow steel section for GB6728-2002 structure.
2. JISG3466-88 Japanese general structure square tube applicable range standard.