Product Introduction

The 3913320201 Steering Knuckle is one of the primary load-bearing components in the front steering axle system of Mercedes-Benz SK, MK, NG series, and Beiben NG80 heavy-duty trucks.

Installed between the front axle beam, king pin assembly, wheel hub, brake components, and steering linkage, the steering knuckle allows the front wheels to pivot smoothly while carrying substantial vertical and lateral loads generated during vehicle operation.

The steering knuckle works together with:

• Front axle beam
• King pin repair kit
• Steering knuckle arm
• Tie rod end
• Drag link
• Wheel hub assembly
• Wheel bearings
• Brake drum or brake disc
• Brake backing plate

Its primary functions include:

• Supporting the front wheel hub assembly
• Providing steering pivot movement
• Transferring steering force to the wheels
• Maintaining accurate steering geometry
• Supporting heavy front axle loads

During heavy-duty transportation, the steering knuckle experiences continuous steering loads, braking forces, road impacts, and vibration. Excessive wear or damage may cause:

• Steering instability
• Wheel alignment deviation
• Uneven tire wear
• Front axle vibration
• Poor steering response
• Reduced driving safety

The 3913320201 steering knuckle is manufactured using premium forged alloy steel through precision forging, CNC machining, and heat treatment. The king pin bore, bearing mounting surfaces, and steering arm mounting points are machined to strict OEM tolerances to ensure perfect fitment, excellent durability, and smooth steering operation.

Designed according to OEM specifications, this steering knuckle provides direct replacement compatibility for Mercedes-Benz SK, MK, NG, and Beiben NG80 front axle systems. It is widely used for steering system repairs, axle rebuilding, fleet maintenance, mining trucks, construction vehicles, and long-haul commercial transport applications.

Each steering knuckle undergoes rigorous quality inspections including:

• Material composition analysis
• Forging integrity inspection
• Heat treatment hardness testing
• Dimensional accuracy verification
• King pin bore precision measurement
• Installation fitment testing

to ensure OEM-level performance, reliability, and durability.

Technical Specifications

Vehicle Fitment

Payment & Shipping

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