... A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY requirementsApplication: Widely used in ... following is the square tube specification we can supplyThe following is the square tube size we can provide for you. Square steel tube (mm )Rectangular steel ... size90*901.5—5.75350*3507.75-11.75We also can custom for ur requirement.100*1001.2—5.75400*4007.75 ...