Material overview of compression spring

Material of compression spring:
Instrument wire for parts beginning with number C: in accordance with ASTM a228 or AMS 5112. When the temperature exceeds 121 degrees Celsius (250 degrees Fahrenheit), the use of musical instrument wire springs is not recommended
Stainless steel wire for parts beginning with number C: 302 stainless steel, conforming to ASTM a313 or AMS 5688, spring tempered (physical and chemical properties only). Springs made of stainless steel are not recommended when temperatures exceed 260 degrees Celsius (500 degrees Fahrenheit)
Musical instrument wire for parts with numbers beginning with D: in accordance with DIN 17223 or JIS g4314 swp-nb
Or AMS 5112, it is not recommended to use the spring made of metal string of musical instrument
Stainless steel wire for parts with numbers beginning with D: 301, 302 or 304 stainless steel, in accordance with DIN 17224 or JIS g4314, Sus 302 / 304 or AMS 5688, spring tempered (physical and chemical properties only). Springs made of stainless steel are not recommended when temperatures exceed 260 ° C (500 ° f)
Type 302 stainless steel is slightly magnetic. There may be a little residual nickel on the surface of stainless steel. This is a normal phenomenon and will not affect the function of the parts
Wire diameter refers to the diameter before forming
Unless stainless steel is specified, musical instrument wire shall be used in general. When inquiring and ordering, the letter “m” or “s” shall be used to indicate stainless steel and musical instrument wire respectively