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TOMEI Main Stud Set - Nissan RB26/RB25/RB20

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Tomei began operations in 1968 as a race car tuner in Japan. Over the last 40 years Japan has emerged as one of the leaders in automotive research, racing, and culture. Tomei products have been utilized in nearly every motor sport imaginable. Tomei’s racing heritage means their research and design team have first hand knowledge of the extreme demands racing puts on an engine. Using only the highest quality materials means that Tomei’s products can handle the intense strain and heat a purpose built engine will experience whether it be on the street or the track. Tomei’s attention to detail is second to none. All of their products are thoroughly researched and engineered to achieve optimal efficiency. Because of even miniscule differences in measurements can cause catastrophic engine failure, all Tomei products fall within strict tolerances. Tomei machines all of their engine components to enhance airflow and ensure proper fitment and seal.

Good quality main studs are important to have to ensure the crank bearing cap is secured with tight tolerances at high RPM and load. Original main bolts have concentrated stress at only 1/3 of its length making that section very weak. Any more torque will most likely break the bolt. These reinforced main studs allow the stress to be dispersed evenly along the threading and secure the bearings.


  • Bolt Material: SNCM439 (WPC finish)
  • Nut Material: SCM435
  • M10 x P1.50
  • Includes Long Bolt x 3
  • Includes Short Bolt x 11
  • Includes Nut x 14


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