Genuine Mazda Front Suspension & Steering Self-Locking Flange Nut • 9YB04-1208

Genuine Mazda Front Suspension & Steering Self-Locking Flange Nut

Replacement Genuine Mazda self-locking flange nut used at multiple front suspension and steering connections on Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models.

The nut is used to retain several safety-critical front suspension and steering fasteners. Confirmed locations include the track-rod end connection to the front hub carrier, the front upper suspension-arm ball joint connection and the lower shock-absorber mounting bolt.

The integrated flange provides a broad seating surface, while the locking feature helps resist loosening caused by suspension movement and vibration.

Each confirmed installation position occurs on both sides of the vehicle. This gives six applications per MX-5 NC in total, although this listing supplies one Genuine Mazda nut.

Important application note: This is a multi-position fastener. The number required depends on which suspension or steering connection is being repaired.

• Part type: Self-locking flange nut
• Common names: Suspension nut / steering nut / ball-joint nut / flange lock nut
• Installation area: Front suspension and steering
• Confirmed position 1: Track-rod end to front hub carrier
• Confirmed position 2: Front upper wishbone ball joint to hub carrier
• Confirmed position 3: Front lower shock-absorber mounting bolt
• Side application: Left and right
• Confirmed quantity fitted per vehicle: 6 across the listed positions
• Quantity supplied: 1 nut
• Track-rod end included: No
• Upper suspension arm included: No
• Shock absorber or mounting bolt included: No
• Brand: Genuine Mazda
• Part No.: 9YB04-1208
• Alternative catalogue formatting: 9YB0-41-208 / 9YB041208
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC models

Typical reasons for replacement:

• Original self-locking nut removed during suspension repairs
• Locking feature weakened by previous use
• Threads damaged, corroded or cross-threaded
• Flange or seating face distorted
• Hexagon rounded by incorrect tools
• Original nut missing
• Track-rod end, upper arm or shock absorber being replaced
• Incorrect general-purpose nut previously installed

Quantity advice: One nut is used at each individual connection. Six are used across all three confirmed left- and right-hand locations. This listing supplies one nut per order quantity.

Fitment advice: Confirm the fastener position before ordering. The MX-5 NC uses several visually similar suspension nuts in different sizes, and they are not necessarily interchangeable.

Replacement advice: Self-locking suspension nuts should normally be renewed after removal where specified by the Mazda workshop procedure. Do not substitute a standard non-locking nut.

Thread inspection: Inspect the corresponding ball-joint stud or mounting bolt before installation. A new nut will not repair damaged, stretched or cross-threaded male threads.

Tightening advice: Tighten the nut using the applicable Mazda torque procedure for its specific installation position. The required tightening specification may differ between the track-rod end, upper ball joint and shock-absorber mounting.

Alignment advice: A wheel-alignment check may be required after replacing a track-rod end or disturbing suspension components that affect front geometry.

Other items to inspect: Check the associated bolt or ball-joint stud, rubber dust boot, hub-carrier mounting bore, suspension bushes and corresponding hardware on the opposite side.

Useful tools / consumables: Correct-size socket or ring spanner, breaker bar, calibrated torque wrench, penetrating fluid and suitable vehicle lifting and supporting equipment.

Difficulty guide: DIY Difficulty: Moderate. Difficulty depends on the installation position and the condition of the original suspension hardware.

Why Genuine Mazda? Genuine Mazda suspension hardware matches the original thread, flange dimensions and locking specification. Correct fasteners are important at safety-critical steering and suspension connections.

What’s in the box: One Genuine Mazda front suspension and steering self-locking flange nut, part number 9YB04-1208.

Installation notes: Raise and support the vehicle safely where required. Clean and inspect the corresponding threads, then start the nut by hand to prevent cross-threading. Tighten it using the Mazda procedure applicable to the exact component being repaired. Confirm that any ball-joint taper is fully seated and that all disturbed suspension or steering components operate correctly before road use.