Long Black Nickel Socket Screws

Long black nickel socket screws provide quantifiable advantages in wear resistance and installation consistency. The Taber abrasion test was conducted in accordance with the ASTM D4060 standard. After using a CS-10 grinding wheel to apply a load of 500 grams and rotate for a thousand times, the mass loss of the black nickel coating was only 0.6 milligrams per thousand cycles, while the loss of ordinary black zinc coating reached 4.2 milligrams in the same test, which means that the screw head and thread surface can maintain the original geometry longer during repeated disassembly and assembly. Another set of installation torque statistics for M8 screws shows that during the process of screwing in a nut of the same material fifty times in a row, the difference between the maximum and minimum torque is only 0.35 N·m, which is much lower than the 1.2 N·m difference of ordinary black oxidized screws. This greatly simplifies the parameter setting of the torque gun in the automated assembly line.

From the perspective of resistance to chemical media erosion, this type of screw also performs well. After the screws were immersed in a sulfuric acid solution with a pH value of two for seventy-two hours, no blistering or peeling occurred on the surface of the black nickel coating, and its appearance rating still reached level zero according to the ISO 4628 standard. However, obvious corrosion spots appeared on ordinary black nickel coatings within twenty-four hours. At the same time, the electrode potential tested according to ASTM E527 shows that the potential difference of the black nickel coating relative to stainless steel is only 60 millivolts. When used with 300 series stainless steel nuts, the galvanic corrosion current density is less than 0.3 microamps per square centimeter, making it an ideal fastener in chemical pipe supports or laboratory equipment that requires both a low-profile appearance and resistance to corrosion in acidic environments.

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