Vertical Water dispenser stainless steel step screw non-standard step screw M2 M3

For hexagonal nuts, commonly used standards include GB52, GB6170, GB6172, and DIN934. The main difference between them is that the thickness of GB6170 is thicker than that of GB52, GB6172, and DIN934, commonly known as thick nuts. In addition, there is a difference in the opposite side. In the M8 nut series, the opposite sides of DIN934, GB6170, and GB6172 are all 13MM smaller than the 14MM opposite side of GB52. The M10 nut series has a 17MM opposite side of DIN934 and GB52, which is 1MM larger than the GB6170 and GB6172. The M12 nut series has a 19MM opposite side of DIN934 and GB52, which is 1MM larger than the 18MM opposite side of GB6170 and GB6172. For M14 nuts, the opposite side of DIN934 and GB52 is 22MM larger than that of GB6170 and GB6172, which is 21MM larger. In addition, the M22 nut has a 32mm across edge for DIN934 and GB52, which is 2MM smaller than the 34mm across edge for GB6170 and GB6172. (GB6170 and GB6172 have the same width across the edges except for their different thicknesses) Other specifications can be universal without considering thickness.

"Nylon self-locking nut
Nylon self-locking nuts are a new type of high vibration resistant and anti loosening fastening component that can be applied to various mechanical and electrical products at temperatures ranging from -50 to 100 ℃. The demand for nylon self-locking nuts in aerospace, aviation, tanks, mining machinery, automobile transportation machinery, agricultural machinery, textile machinery, electrical products, and various types of machinery has increased sharply. This is because its anti vibration and anti loosening performance is much higher than other anti loosening devices, and its vibration life is several times or even dozens of times higher. More than 80% of current mechanical equipment accidents are caused by loose fasteners, especially in mining machinery. The use of nylon self-locking nuts can prevent major accidents caused by loose fasteners"

"Friction type high-strength bolts: suitable for connecting steel frame beams and columns, solid web beam connections, heavy-duty crane beam connections in industrial buildings, brake systems, and important structures that bear dynamic loads.
Pressure bearing high-strength bolts: can be used for shear connections in static load structures that allow for a small amount of sliding or components that indirectly bear dynamic loads.
Tensile high-strength bolts: When the bolt is in tension, its fatigue strength is relatively low. Under dynamic load, its load-bearing capacity is not easy to exceed 0.6P (P is the allowable axial force of the bolt). Therefore, it is only suitable for use under static load, such as flange docking of compression members, T-joints, etc"

"Generally, surface treatment is not required for lifting ring screws, but according to requirements, surface treatments such as galvanizing, passivation, and chromium plating can be carried out, and they should comply with the provisions of GB5267-85.
After electrogalvanizing, the chemical composition and mechanical properties of the material should be immediately subjected to oxygen removal treatment according to the test method specified in GB699. During routine inspection, the grain size test may not be advanced, and the testing method for grain size shall be in accordance with the provisions of YB27. Thread inspection is carried out using thread gauges and smooth limit gauges or universal gauges"