Genuine Mazda Gearbox Bellhousing Bolt • 9YA0-21-024A

Genuine Mazda 9YA0-21-024A Gearbox Bellhousing Bolt

Replacement Genuine Mazda gearbox bellhousing bolt for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC models from 2005 to 2015 listed in the compatibility table.

This high-tensile fastener is used at the gearbox bellhousing to secure the transmission assembly to the engine. Correct bellhousing fasteners help maintain secure gearbox-to-engine alignment and prevent unwanted movement between the adjoining assemblies.

This listing is for one Genuine Mazda gearbox bellhousing bolt. Several fasteners may be used around the transmission bellhousing, and their length or position can differ, so match the original bolt and fitting location before installation.

Replacement should be considered where the original bolt has damaged threads, a rounded or distorted head, significant corrosion, visible stretching or evidence of previous overtightening. A damaged fastener can prevent correct clamping of the transmission housing to the engine.

• Part type: Gearbox bellhousing / transmission mounting bolt
• Primary use: Secures the transmission bellhousing to the engine assembly
• Location: Gearbox bellhousing and engine joint
• Position: Position-dependent around the transmission bellhousing
• Quantity per vehicle: Multiple bellhousing fasteners are used; quantity and specification vary by fitting position
• Quantity supplied: One bolt
• Brand: Genuine Mazda
• Part No.: 9YA0-21-024A
• Also referenced as: 9YA021024A
• Previous Mazda number: 9YA0-21-024 / 9YA021024
• Fitment note: Confirmed for Mazda MX-5 NC applications; match the original bolt length, specification and bellhousing position

Fitment advice: Match this bolt against the original fastener and its location within the gearbox bellhousing assembly. Different bolt lengths or specifications can be used around the bellhousing. For imported, modified or previously repaired cars, matching the original part number and component arrangement is recommended.

Other items to consider: When changing this part, you may also want to consider purchasing any additional damaged or missing bellhousing bolts, gearbox mounting hardware, starter-motor fasteners, clutch components, gearbox seals and transmission oil appropriate to the work being completed.

Useful tools / consumables: Suitable socket and extension set, calibrated torque wrench, thread-cleaning equipment, penetrating fluid and transmission lifting or support equipment where removal of the gearbox is required.

Difficulty guide: DIY Difficulty: Moderate to Advanced. Accessibility depends on the bolt position, and some bellhousing fasteners can be difficult to reach with the transmission installed. Gearbox removal requires suitable lifting and support equipment.

Why Genuine Mazda? Genuine Mazda transmission fasteners are manufactured to the original thread dimensions, length, material specification and strength requirements. Using the correct OE bolt helps maintain secure gearbox-to-engine alignment, reliable clamping and compatibility with the original engine and transmission housings.

What’s in the box: One Genuine Mazda gearbox bellhousing bolt, part number 9YA0-21-024A.

Installation notes: Clean and inspect the mating threads before installation. Start the bolt by hand to prevent cross-threading, ensure the engine and transmission housings are correctly aligned and tighten the fastener to the applicable Mazda workshop specification. Do not substitute a different bolt length or strength grade.