What are extended wheel bolts made of?
The extended lug wheel bolts applied JIS SCM440 steel material. Lug bolts 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… They are strong enough to deal with fierce racing events. For normal driving, they can easily bear hundreds of intense impacts. Safer and better than those cheap casting competitors.