Complete suspension arm kit with control arms links ball joints and tie rod ends

Suspension Parts

Control Arm and Suspension Arm Kits

Name: Control Arm
Brand: Kingrun Auto

The control arm ties the wheel hub to the body and lets the suspension move without losing alignment.

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Timing and chassis component layout used for identification

Overview

Control Arm

The control arm ties the wheel hub to the body and lets the suspension move without losing alignment. When the bushings go soft or the ball joint develops play, the customer hears clunking, the tyres wear unevenly and the steering wanders. We supply upper, lower and single arms, and complete arm kits that put the arms, links, ball joints and tie rod ends in one box.

Key Benefits

Complete arm kits so an alignment job is done in one visit instead of two
Upper, lower and single arms to suit double wishbone and MacPherson strut layouts
Steel and aluminium bodies matched to the original application
Matched by OE number, which is what tells the two arms apart on the same platform
1 piece minimum order for a single arm, or a kit when the whole corner is being rebuilt

Email this requirement Specifications

Who It Is For

Suspension and steering parts distributors
Repair workshops that sell a corner rebuild rather than a single component
Exporters covering chassis parts for European, American and Asian platforms
Buyers assembling a suspension kit for one vehicle family

Problems It Solves

Worn bushings that cause noise, vibration and poor handling
Faulty ball joints that clunk, wear tyres unevenly and upset the steering
Bent or damaged arms that hold the wheel out of alignment no matter how often it is set
Buying arms and links from different suppliers and finding the geometry does not agree

Application Scenarios

Suspension overhaul where worn bushings have thrown the alignment out
Corner rebuild after a pothole impact has bent an arm
Fleet servicing where clunking over bumps is the reported fault
Distributor kits for high volume platforms where arms, links and rod ends are replaced together

Engineering

Technical Features

Upper control arm sits above the wheel hub, mainly on double wishbone systems
Lower control arm sits below the wheel hub, common on both MacPherson strut and double wishbone systems
Single control arm serves simpler setups, typically paired with a strut
Bushings and ball joints pressed and specified to the original application

Materials

Steel, durable and strong, used on most vehicles
Aluminium, lightweight and corrosion resistant, used on high performance and luxury vehicles
Composite materials where the original balances strength, weight and durability

At a glance

Key figures for Control Arm
Arm types supplied	Upper, lower, single
Kit content	Arms, stabiliser links, ball joints and tie rod ends as shown per kit
Materials	Steel, aluminium, composite as per application
Matched by	OE number
Minimum order	1 piece
Lead time, regular items	45 days

Values not present in the source part record are marked TBC and confirmed against your OE number before the order is placed.

Manufacturing

How It Is Made and Checked

Forging or stamping of the arm body

Machining of the bushing and ball joint seats

Pressing of bushings and joints

Assembly, inspection and kit packing

Quality Control

Arms are checked for bushing seat dimensions and ball joint retention before the kit is packed. The company runs to ISO 9001 and IATF 16949 quality management systems and provides lifetime maintenance support on the parts it supplies.

Customisation Options

Kit content can be built to your specification, for example arms only, arms plus links, or a full corner. Packaging and carton marking follow your scheme. New references take 30 to 45 days to develop.

Comparison

A steel arm is the normal choice where the original is steel: strong, repairable and inexpensive. An aluminium arm saves unsprung weight and resists corrosion, which is why performance and luxury platforms use it, but it cannot be straightened after an impact. Replacing a single arm is cheaper today; replacing the corner as a kit avoids a second alignment when the next joint gives out a month later.

Use Guide

Step 1
Identify the arm by OE number and confirm whether it is the upper, lower, left or right position
Step 2
Support the hub before removing the old arm so the driveshaft and brake hose are not loaded
Step 3
Fit the new arm and torque the bushing bolts with the suspension at ride height, not hanging
Step 4
Fit the ball joint and links supplied in the kit at the same time
Step 5
Set the wheel alignment before the vehicle is handed back

Component reference

How a Control Arm Works

A control arm, also known as an A-arm or wishbone, is a critical component in a vehicle's suspension system. It connects the steering knuckle to the vehicle frame and allows for the up and down movement of the wheel, ensuring stability and smooth handling.

Key Characteristics of a Control Arm:

Functionality: The control arm connects the wheel hub and steering knuckle to the vehicle's frame or body. It allows the wheel to move up and down with the suspension while maintaining the wheel's alignment and position. It helps absorb shocks from the road, contributing to a smoother ride and better handling.
Components: Arm: The main body of the control arm, typically shaped like an "A" or a wishbone. Ball Joint: A pivot point that connects the control arm to the steering knuckle, allowing for movement in multiple directions. Bushings: Rubber or polyurethane components that cushion the connection between the control arm and the vehicle frame, reducing vibration and noise.
Types of Control Arms: Upper Control Arm: Positioned above the wheel hub, primarily found in double wishbone suspension systems. Lower Control Arm: Located below the wheel hub, common in both MacPherson strut and double wishbone suspension systems. Single Control Arm: Used in simpler suspension setups, typically paired with a strut. Materials: Steel: Durable and strong, commonly used in most vehicles. Aluminum: Lightweight and resistant to corrosion, used in high-performance and luxury vehicles. Composite Materials: Offer a balance of strength, weight, and durability. Applications: Automotive Suspension Systems: Found in both front and rear suspensions of many types of vehicles, including cars, trucks, and SUVs. Performance and Racing Vehicles: Enhanced control arms made from lightweight materials for improved handling and reduced weight. Maintenance: Regular inspection for wear and tear, especially on ball joints and bushings. Replacement of worn or damaged bushings and ball joints to maintain proper alignment and handling. Ensuring that the control arm itself is not bent or cracked, which could compromise suspension performance. Common Issues: Worn Bushings: Can cause excessive noise, vibration, and poor handling. Faulty Ball Joints: May result in clunking noises, uneven tire wear, and steering problems. Bent or Damaged Arm: Can affect wheel alignment and vehicle stability.