TPI Wheel Bolts (10 pcs), Conical Seat, 17mm Hex, M14×1.5, 45mm, Chrome Colour

TPI locking wheel bolts are used to securely fasten the wheels of your car. They are made of heat-treated steel, which ensures consistent hardness and strength. An advanced surface treatment protects the bolts from corrosion, which has been verified by salt spray tests. The 60° conical seating surface ensures that the wheel is seated correctly. The bolts are designed to meet and exceed OEM standards.

Durable Material and Heat Treatment

The basis of these bolts is an ASTM 4140/SCM 440 steel alloy, also known as chrome-molybdenum steel. This material has a high tensile strength, which is key for safety. Each bolt undergoes a heat-tempering process. This achieves consistent hardness throughout the entire volume of the material, which eliminates the risk of weak spots. The strength and durability are then verified by strict tensile tests to ensure reliability in real-world use.

Corrosion Protection

TPI bolts are protected by a multi-layer surface treatment, which consists of zinc, a triple layer of nickel and a final chrome layer. This process creates a barrier that effectively prevents corrosion caused by weathering, water and road salt. The effectiveness of the protection is confirmed by salt spray testing, which is a standardised test that simulates long-term exposure to an aggressive environment. This ensures that the bolts retain not only their functionality, but also their appearance.