Dongguan Zuolong Machinery Co., Ltd. upholds a spirit to be down-to-earth and fearless in the development. Now we have many honors and certifications. Zuolong Machinery enjoys a superior geographical location with many transportation routes. This facilitates the going out of people and the transportation of goods. Since the establishment, Zuolong Machinery has always been focusing on the R&D and production of cylinder bed sewing machine . With great production capability, we can provide customers with personalized solutions according to their needs. Zuolong Machinery not only has a great production capability, but also a professional technical and R&D team. We can continue to provide professional processing services. We are also available in customized services based on the picture or sample.

The straight thread steel head of the wire has been cut to change the slag pressure welding. Should the steel head be treated? Need,Weakened the diameter of the steel bar,

Is the outer thread of the bolt right-handed and the inner thread of the matching nut left-handed? Because I cut the nut axial with the cutting machine, why? 5 The outer thread of the bolt is right-handed, and the inner thread of the matching nut is also right-handed.If you look at it in perspective, you will understand it.Carefully observe,What you said was impossible,Violating the threaded connection.It's right-handed,