Type 400 series stainless steel balls includes 420 440 They are corrosion resistant and with higher hardness commonly used in environment that require hardness, strength and wear resistance.

440/440C stainless steel ball

Characteristics: hardness of 56-58 degrees, magnetic, good corrosion resistance, wear resistance and strong toughness  Diameter size :0.5mm to 50.8mm  Precision Grade:G10-G1000

Application: mainly used in bearings, stamping / hydraulic parts, valves, seals refrigeration equipment, aerospace high-precision mechanical parts, crafts, toys.

 

440C stainless steel balls are commonly used in industries requiring high precision and anti-rust properties: aviation, aerospace, bearings, motors, high-precision instruments, valves, and petroleum.

Characteristics: The metallurgical organization belongs to the martensitic type steel. Heat treatment process is difficult and easy to crack, 440c stainless steel ball is the hardest ball in steel ball industry : its HRC ≧ 58. The hardness is close to that of the bearing steel ball, but it has stronger rust and corrosion resistance than the former.

Comparison: Compared with 440 stainless steel ball, it has stronger anti-rust and anti-corrosion feature , hardness is enhanced, and wear resistance is also improved.
 

420 stainless steel ball

Characteristics: Representative of martensitic steel, commonly known as stainless iron with a certain degree of corrosion resistance and toughness it is magnetic , high hardness  HRC50-55. Diamemter Size: 2.0mm-50.8mm   Precision grades: G20 G40, G100, G500, G1000.

Application: it is usually used in industries with high requirements for precision and anti-rust performance: motorcycle accessories, pulleys, stainless steel bearings, plastic bearings, handicrafts, valves, oil and Suitable for all kinds of precision machinery, bearings, electrical equipment, transportation tools, household appliances and so on. It is mostly used to make parts that are resistant to atmospheric, water vapor, water and oxidizing acids.