What is the meaning of 8 minus in the spiral steel tube

- Apr 20, 2019-

What is the meaning of "8 minus" in the spiral steel tube

Many customers who buy spiral steel pipe often encounter some industry terms, such as what is said in the spiral steel pipe.The so-called inspection ruler is delivered according to the length, that is to say, if the user wants 12 meters, then 12 meters will be delivered.The so-called.8 is calculated according to the adjustment of weight, such as 219*6 spiral steel pipe, because there is a difference in the wall thickness, according to 219*5.8 to calculate the theoretical weight.