Cotter pin nut for wishbone ball joint front. Porsche 911 1969-89 / 914 1972-76

Cotter pin nut for wishbone ball joint front.
Designed for the front wishbone (control arm) ball joint. Engineered to original Porsche specifications, this nut ensures safe, reliable fastening of the lower ball joint to the suspension arm on Porsche 911 and 914  models.
Sold each. Fits left and right.

Fits:
Porsche 911 1969 - 1989
Porsche 914 1972 - 1976

Diagram ref no 22

The cotter pin nut fastens the lower ball joint to the front suspension arm and secures it with a locking cotter pin through the castle slots. This prevents the nut from rotating loose, maintaining safe steering and suspension geometry during operation.

Over time, nuts can wear, corrode, or lose torque retention due to repeated assembly, age, or exposure to moisture and road debris. A weakened or reused nut may compromise the ball joint’s security, leading to excessive play or unsafe suspension movement.

When to Replace:
• During front suspension rebuilds or ball joint replacement.
• If the original nut is rusted, damaged, or has distorted threads.
• Whenever the cotter pin is replaced, ensuring proper torque and locking function.

Replacing a new cotter pin nut restores factory-level safety, alignment integrity, and reliability in your classic Porsche’s suspension system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90008400402

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