The matching wheel studs applied JIS SCM440 steel material. Wheel lug studs made of forged SCM440 alloy steel feature many desirable properties such as high strength, wear-resistance, excellent toughness, and impact resistance. It also has good ductility and high-temperature stress resistance, structural stability, low harmful elements, few surface defects and more advantages. They have achieved ISO standard grade 12.9, tensile strength≥1,220Mpa, ultimate tensile load≥152,000N, hardness (HV)≥395, NSS≥500H…