Material: Metal – 4340 Steel

4340 is a strong and ductile steel with both impact and shock resistance making it ideal  for high stress parts including piston pins, bearings, gears, axels, spindles, couplings, and dies. When heat treated and hardened, 4340 demonstrates excellent tensile strength, toughness, and wear resistance.  4340 is used in the aerospace, automotive, and oil and gas drilling industries. Most commonly, it used for airplane landing gear, power transmission gears and shafts, and other structural parts.