Special-shaped screw rod is also called single-head screw rod. It refers to a bolt with no head at one end and partly threaded bolt at the other end. Generally, a special-shaped screw rod is more flexible and convenient than ordinary bolts. The nut can also be used as an ordinary bolt. The product materials of this kind of bolts are 45# steel, 35crmo, or ordinary Q235, 195 and other materials. Single-head bolts should be used in the case of ≤1.6MPa, and double-head studs are used in other cases. The commonly used 4.8 grade is used in places below 1.0 MPa, and the 8.8 grade can be used in places below 1.6 MPa, but the specific requirements Depending on the characteristics of the medium, the uniform requirements of the device can be high and low, but it is never allowed to replace high with low, including studs, and there are also high and low pressures (generally can be seen from the pitch and the thickness of the nut).

The products of Qingdao Haorui Steel Products Co., Ltd. mainly include: furniture screws, rigging pins, automobile screws, single-head screw rods, and hollow rivets, semi-hollow rivets, pins, flat washers, nuts, etc. of various specifications and materials. Firmware, and customized various special-shaped fasteners, Qingdao non-standard nuts, etc., while processing and producing standard parts with various specifications of raw materials, cold drawn wires, processing, straightening and blanking.