Mazda 13B 12.7mm Stud Kit – Suits RX4, RX5, RX7, Luce, Parkway, Pickup & Cosmo

Strengthen Your Mazda 13B Engine — Built for Performance, Sealing & Reliability

Our 12.7mm stud kit is a high-strength upgrade designed for serious rotary builders looking to enhance the integrity of their 13B engine platform. Whether you're building for street, circuit, or drag applications, these studs provide superior clamping force to help maintain long-term sealing between rotor housings and end plates — critical for high-compression or boosted setups.

Each stud is precision-machined in-house from premium-grade material and finished to exacting tolerances to ensure correct thread engagement, torque distribution, and long-term durability. This kit is ideal for applications exceeding factory limits, where factory through-bolts may no longer offer sufficient reliability.

Kit Features:

• Complete stud kit with matching washers and nuts
• Manufactured in Australia for professional engine builders
• Supports extreme boost, high RPM, and race-duty use
• Compatible with all OEM-style 13B engine layouts

Fitment:

• Mazda RX-4 (13B rotary) – sold in Australia, Japan, and North America
• Mazda RX-5 / Cosmo – early- and late-model chassis with 13B engines
• Mazda RX-7 Series 1–3 (SA/FB chassis) – global release models
• Mazda Luce and Parkway Rotary – domestic Japanese and export variants
• Mazda Rotary Pickup (REPU) – USDM rotary-powered trucks

This 12.7mm kit is ideal for local restorations and overseas builds alike — giving you confidence in both stock port and high-horsepower applications. Whether you’re maintaining a piece of rotary heritage or preparing your 13B for modern power levels, this stud kit delivers lasting strength where it counts.

⚠️ Time-Sensitive Build? Contact us before placing your order to confirm availability and turnaround time.

⚠️ Not seeing your model listed? Get in touch — we may be able to supply a custom solution for your build.