Pin, Crown Spring, Banana Insert - Technical Requirements:1. The main material is brass H62, and the crown spring and drum spring are made of beryllium copper2. Coating: Nickel bottom gold plating, nickel plating thickness 50-80u, gold plating thickness greater than or equal to 2u, gold purity used in the coating ≥ 99.8%. Apply solid film protector.3. Smooth surface, without oxidation or burrs.4. Hardware should not have knife marks, pinch marks, sharp edges, or other phenomena5. Unspecified tolerance ± 0.02Material requirements for associated terminals:1. Material: brass, phosphor copper, bronze (can be customized according to customers) Material thickness: 0.2, 0.25, 0.32. The opening of the female end should not be skewed, and the round head of the male end should not be twisted;3. The curvature of the belt should not exceed 5mm for 1M;4. The surface must not have any pressure damage, deformation, oxidation or other phenomena;5. Mark tolerances as the key control dimension;Electroplating specifications:1. Appearance requirements: No adverse phenomena such as oxidation, yellowing, blackening, blueing, purplish, hooked pins, high and low pins.2. Electroplating performance requirements: Full nickel bottom 50u "-80u", gold plated foot 1u ", measuring points on both sides 3mm;3. Need to withstand a high temperature of 260 degrees Celsius for 5 seconds without discoloration, blackening, yellowing, bubbling, peeling, and other adverse phenomena;4. Tin eating performance test is required, with a minimum tin coverage rate of 95%;5. A salt spray performance test is required, with a salt water concentration of 5% and a continuous 24-hour exposure to a temperature of 35 ° C, without any adverse phenomena such as oxidation or blackening;6. Peeling test is required: there is no peeling or peeling phenomenon on the curved surface;7. The product electroplating meets the requirements of green and environmentally friendly ROHS.8. All measuring points and surfaces are electroplated according to the requirements of the measuring points (the measuring points are generally important parts for tin and conductivity)