Genuine Mazda Rear Subframe Brace Bar Bolt • 99466-1225

Genuine Mazda 99466-1225 Rear Subframe Brace Bar Bolt

Replacement Genuine Mazda rear subframe brace bar bolt for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 (NC) and selected Mazda RX-8 applications listed in the compatibility table.

This is the Genuine Mazda bolt used to secure the rear underbody brace bars / cross bars in the rear subframe area. These brace bars help tie the rear subframe and underside of the body together, supporting the factory chassis bracing layout and keeping the rear structure correctly clamped in place.

There are typically six rear subframe brace bar bolts fitted per vehicle on the MX-5 NC rear brace bar arrangement. They are located underneath the rear of the car where the diagonal brace bars attach between the rear subframe area and the underside of the body.

This part is commonly replaced when the original bolts are heavily corroded, rounded, stretched, damaged during removal, missing, or no longer suitable to reuse after rear subframe brace bar replacement. On ageing MX-5 NC models, these bolts are often removed during underbody corrosion repair, rear subframe work, brace bar replacement or suspension refurbishment.

• Part type: Rear subframe brace bar bolt / cross bar bolt / underbody brace fastener
• Primary use: Secures rear brace bars / cross bars to the rear subframe and body mounting points
• Location: Rear underside of vehicle, rear subframe brace bar area
• Quantity per vehicle: 6 on MX-5 NC rear brace bar arrangement
• Brand: Genuine Mazda
• Part No.: 99466-1225
• Official Mazda reference: 9946-61-225
• Also referenced as: 994661225
• Designed for Mazda applications listed in the compatibility table

Fitment advice: Designed for the Mazda rear brace bar / rear lower arm and subframe applications listed in the compatibility table. For MX-5 NC models, this bolt is used with the rear diagonal brace bars that connect the rear subframe area to the body structure.

Other items to consider: When changing this part, you may also want to consider purchasing related items such as rear subframe brace bars, corrosion treatment, cavity wax or underbody protection. If the brace bars are badly corroded, replacing the bars and fasteners together is usually the best approach.

Useful tools / consumables: Vehicle lift or axle stands, socket set, breaker bar, torque wrench, penetrating fluid, wire brush, impact tools where suitable, rust treatment, underbody protection, safety glasses and gloves.

Difficulty guide: DIY Difficulty: Easy to Moderate. The bolts are external underbody fasteners and are generally accessible with the car safely raised, but corrosion and seized fixings can make removal more difficult. Take care when removing heavily corroded bolts to avoid damaging the surrounding brace or captive mounting points.

Why Genuine Mazda? Genuine Mazda fasteners are made to match the original specification for thread pitch, length, head size, strength grade and coating. Using the correct Genuine Mazda bolt helps maintain the proper clamping force and fitment of the rear brace bar assembly, reducing the risk of poor fit, loose braces, damaged threads or incorrect hardware being used.

Why buy from Mazspec? Mazspec specialises in Mazda and MX-5 parts, with practical experience of the common corrosion and underbody issues found on ageing NC models. We stock genuine Mazda brace bars, bolts, nuts and related hardware, and can help with the parts needed to refresh the rear subframe bracing properly.

What’s in the box: One Genuine Mazda rear subframe brace bar bolt.

Installation notes: Clean the mating points and threads before installation. Apply suitable corrosion protection to the surrounding area after fitting and tighten all fixings to Mazda workshop manual torque specification.