What material is pogopin made of?

　　The pogopin (spring needle) consists of three components. The needle head and needle tube are generally made of the same material, and are generally made of brass in copper, as well as stainless steel and alloy materials. The stainless steel series mainly includes SUS430, SUS316, and SUS904, with SUS316 and SUS90 having better corrosion resistance; The copper series includes brass, phosphor copper, and beryllium copper. Brass has excellent conductivity, while beryllium copper has excellent conductivity and fatigue resistance; Hastelloy alloy is one of the materials with the best corrosion resistance in the alloy series.

　　The spring of pogopin is made of high carbon steel material, common materials include SWP (piano steel wire), stainless steel, and beryllium copper. SWP (piano steel wire) has excellent tensile properties, good elasticity, and long mechanical life; But this material is a high magnetic material that is prone to curling and corrosion at high temperatures. Therefore, it must be processed before use; As for stainless steel material, it is a low magnetic material and can withstand high temperatures, so it is also a common material for springs in pogopins; Beryllium copper has excellent fatigue resistance and low impedance. However, its tensile properties are relatively poor, and it is usually not a good choice when small wire diameters and larger force values are required.

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