TOYOTA 90126-10024 Hex Lobular Stud

The Toyota 90126-10024 is a genuine (OEM) high-strength stud (STUD, HEX LOBULAR) specifically engineered for the secure fastening of critical vehicle structural assemblies. The internal drive (hex lobular / Torx) design on one end enables precise, damage-free threading into the mating component, ensuring accurate torque application.

Technical Characteristics and Specifications

• Manufacturer: TOYOTA (Genuine OEM part)
• Part Type: Stud with internal drive end (Stud, Hex Lobular)
• Material Quality: Heat-treated, high-tensile steel alloy engineered to withstand extreme mechanical and thermal stresses.
• Surface Treatment: Specialized anti-corrosion coating to prevent rust and thread galling.
• Drive Type: Hex lobular (Torx profile) end to facilitate installation.

Function and Importance in the Vehicle

Studs play a crucial role in securing components such as the engine block, cylinder head, exhaust manifold, or turbocharger. Unlike conventional bolts, a stud remains threaded stationary into the mating base (for instance, an aluminum casting); during component installation and tightening, wear is not placed on the component's internal threads, as the clamping force is exerted by the nut on the stud. This significantly minimizes the risk of stripping or damaging costly engine components.

Signs of Wear and Failure

Studs are exposed to severe temperature fluctuations and continuous vibration, making replacement necessary if any of the following symptoms appear:

• Thread Elongation: Overtorquing or repeated thermal expansion can stretch the threads, resulting in loss of clamping load and potential leaks.
• Corrosion and Oxidation: Around the exhaust system, intense heat and moisture can degrade the stud and cause it to seize.
• Shearing or Breakage: Metal fatigue or improper torque application can cause the stud to shear or fracture.

To maintain safe and leak-free operation, loosened or damaged studs should always be replaced with new genuine Toyota parts.