ARP 218-5401 Main Stud Kit for 1989-2005 Mazda Miata 1.6L/1.8L BP

Vehicle Fitment

• 1989-2005 Mazda Miata (NA/NB) - 1.6L/1.8L BP DOHC

Features

• Eliminates main cap walk and fretting
• Protects engine block threads
• Manufactured from 8740 chromoly steel
• Heat-treated to 190,000 psi tensile strength
• Precision J-form threads rolled after heat treatment
• Black oxide finish for corrosion resistance
• Includes hardened parallel-ground washers
• Comes with high-quality 12-point nuts

Specifications

• Fastener Style: Stud
• Fastener Nut Style: Standard 12-point
• Thread Size: M10
• Material: 8740 chromoly steel
• Tensile Strength: 190,000 psi
• Finish: Black oxide
• Includes: 10 studs, 10 nuts, 10 washers

Included Components

• 10x ARP 8740 chromoly main studs
• 10x 12-point nuts
• 10x hardened parallel-ground washers
• Installation instructions

Product Description

The ARP 218-5401 Main Stud Kit is designed for the 1989-2005 Mazda Miata equipped with 1.6L or 1.8L BP DOHC engines. This kit replaces the factory main cap bolts with high-strength studs, enhancing the engine's reliability and performance.

Constructed from 8740 chromoly steel and heat-treated to a tensile strength of 190,000 psi, these studs offer superior durability. The precision J-form threads are rolled after heat treatment, resulting in threads that are 1000% stronger than standard bolts. The black oxide finish provides corrosion resistance, ensuring longevity even in harsh environments.

The kit includes hardened parallel-ground washers and high-quality 12-point nuts, ensuring even load distribution and accurate torque readings. Installation is straightforward, and the kit comes with detailed instructions to guide you through the process.

Whether you're upgrading your engine for increased performance or seeking a reliable solution to prevent main cap walk and fretting, the ARP 218-5401 Main Stud Kit offers the strength and reliability you need.