Product Introduction

The 3933380201 Steering Knuckle Arm is a key steering component used in the front axle steering system of Mercedes-Benz SK, MK, NG series, and Beiben NG80 heavy-duty trucks.

Mounted directly onto the steering knuckle, the steering arm transfers movement from the drag link or tie rod end to the steering knuckle, allowing the front wheels to turn accurately according to the driver's steering input.

The steering knuckle arm works together with:

• Steering gearbox
• Drag link
• Tie rod end
• Steering knuckle
• King pin assembly
• Front axle beam
• Wheel hub assembly

Its primary functions include:

• Transmitting steering force efficiently
• Maintaining accurate steering geometry
• Supporting heavy steering loads
• Ensuring precise wheel turning angles
• Improving vehicle handling and stability

During heavy-duty truck operation, the steering arm is continuously subjected to steering loads, braking forces, road shocks, and vibration. Excessive wear, bending, or cracking can lead to:

• Loose steering
• Incorrect wheel alignment
• Poor steering response
• Uneven tire wear
• Increased steering effort
• Reduced driving safety

The 3933380201 steering knuckle arm is manufactured using premium forged alloy steel and precision CNC machining. Heat-treated construction provides superior mechanical strength, while the accurately machined mounting surfaces and tapered holes ensure perfect OEM fitment and long-term durability.

Designed according to OEM specifications, this steering arm provides direct replacement compatibility for Mercedes-Benz SK, MK, NG, and Beiben NG80 steering systems. It is widely used for steering system repairs, front axle rebuilding, fleet maintenance, and commercial truck overhaul.

Each steering knuckle arm undergoes comprehensive quality inspections including:

• Material composition analysis
• Forging quality inspection
• Hardness testing
• Dimensional accuracy verification
• Mounting hole precision inspection
• Installation fitment testing

to guarantee reliable OEM-quality performance.

Technical Specifications

Vehicle Fitment

Payment & Shipping

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