车用螺纹磨具
thread grinding apparatus for lathe application
缝纫机用螺纹
sewing machine (screw) thread
贯穿螺栓上紧用液压装置
hydraulic device for tightening tie-bolt
hydraulicdevice for tightening tie-bolt
螺纹用分厘卡
thread micrometer [caliper
气瓶专用螺纹
Special threads for gas cylinders
用螺纹装置撑开及收缩的套管封隔器
screw casing anchor packer
专用螺纹修理包
individual thread repair kit