Genuine Mazda Suspension / Differential / Engine Mount Flange Nut • 9YB0-41-216

Genuine Mazda 9YB0-41-216 Suspension / Differential / Engine Mount Flange Nut

Replacement Genuine Mazda flanged self-locking mounting nut for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models.

This multi-purpose nut is used at several suspension, differential and engine-mount attachment points around the MX-5 NC chassis.

Confirmed MX-5 positions include rear trailing-arm and suspension-link bolts where a standard fixing bolt is used, the lower front shock-absorber mounting bolts, differential mounting studs securing the differential to the rear subframe, and selected engine-mount fixings.

The integral flange spreads the clamping force across the mounting surface without requiring a separate conventional washer at the specified position. Its locking design helps resist loosening caused by vibration, suspension movement and drivetrain loading.

Fourteen nuts are used across all of the listed MX-5 NC mounting positions. This listing supplies one Genuine Mazda nut, so select the quantity required for the repair being carried out.

Replacement should be considered where the original nut is corroded, rounded, seized, cross-threaded, missing or no longer provides the intended locking resistance.

• Part type: Flanged self-locking mounting nut
• Primary uses: Suspension arms, shock absorber, differential mounting and engine mounting
• Confirmed MX-5 generation: Mk3 / Mk3.5 / Mk3.75 NC
• Quantity used across all listed NC positions: 14
• Quantity supplied: 1 nut
• Brand: Genuine Mazda
• Part No.: 9YB0-41-216
• Also referenced as: 9YB041216
• Compatible wider Mazda application: Selected Mazda RX-8 mounting positions

Confirmed MX-5 NC mounting positions:

• Rear trailing arms and suspension link arms to the rear subframe or wheel knuckles where a standard bolt is used
• Lower front shock absorbers to the lower wishbones
• Differential mounting studs to the rear subframe or cradle
• Selected engine-mount attachment points

Fitment advice: This nut is used in several locations, but not every suspension position uses the same fastening arrangement. Some alignment points use eccentric bolts and different associated hardware. Match the nut to the original Mazda part number and fixing position before installation.

Other items to consider: Inspect the associated bolt or stud, mounting washers where specified, suspension bushes, differential mounts, engine mounts and surrounding brackets. Replace any fastener with damaged, stretched or heavily corroded threads.

Useful tools / consumables: Suitable socket and spanner set, breaker bar, penetrating fluid, calibrated torque wrench, wire brush and suitable support equipment for the suspension, differential or engine depending on the mounting position.

Difficulty guide: DIY Difficulty: Moderate. An accessible mounting nut may be straightforward to replace, but suspension, differential and engine components must be supported correctly before their mounting hardware is loosened. Wheel alignment may be required where suspension geometry has been disturbed.

Why Genuine Mazda? Genuine Mazda mounting hardware is manufactured to match the original thread, flange diameter, strength specification and locking characteristics required for the intended mounting points. Correct hardware helps maintain the specified clamping force and compatibility with the original bolts, studs and brackets.

What’s in the box: One Genuine Mazda flanged self-locking mounting nut, part number 9YB0-41-216.

Installation notes: Support the relevant suspension, differential or engine component securely before loosening its mounting hardware. Clean and inspect the mating threads, start the new nut by hand to prevent cross-threading and tighten it to the Mazda workshop specification for the exact mounting position. Do not apply one generic torque value to every use of this nut, as the required specification depends on the associated bolt, stud and component.