学帮网1/2 NPT class 3000 forged steel threaded coupling是什么意思1-1/2 NPT class 3000 forged steel threaded coupling呢?
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/28 07:35:27
1/2 NPT class 3000 forged steel threaded coupling是什么意思
1-1/2 NPT class 3000 forged steel threaded coupling呢?
NPT是英标.是螺纹的标准!