Ball Joints

A safety-critical part, the ball joint acts as a Block 1 pivot between the wheels and suspension, allowing the vehicle to be steered, whilst also ensuring a comfortable ride. Since it constantly pivots through multiple planes and angles, it is subject to significant stress and wear. So, you’ll want to fit a high-quality ball joint that has been designed, engineered and manufactured to the same standards as OE.
  • Manufactured to OE standards for control, comfort and durability
  • Ball-pin 100% crack tested for flaw free material
  • Undergo rigorous performance and resilience tests
  • Chloroprene rubber cover protects internal components
  • Superior ball-pin finish and nylon seat coating for smooth movement and long lifetime
  • High specification grease for reduced friction, and smooth operation in all temperatures and conditions
  • Cataphoretic coating where required provides longer lasting corrosion protection
  • Access to technical hotline and support
  • Three-year/36,000-mile warranty on all steering parts – available in UK only

Precision engineering

Enabling free movement in two planes at the same time, the ball-pin is a critical component. That’s why our ball-pins are manufactured from high-grade steel and machined to micron tolerances. Together with a polyoxymethylene nylon ball-pin seat, they provide optimum durability and smooth joint operation.


Extensive testing

Delphi ball joints undergo rigorous performance tests including angular stress testing, where the ball is rotated through its angular and rotational travel under load, as well as a pull and push out test, to measure the force required for it to break away from the housing. These important safety tests ensure the ball joint can withstand the same forces as the OE part.

Longer service intervals

We provide a range of sealed ball joints, that are lubed for life with a high-specification grease, to minimise maintenance requirements. Alongside our precision ball-pin finish and improved rubber boot design, they offer longer ball joint service intervals and better grease retention.

Greater protection

To help prevent damage to the joint’s internal components, all our ball joints come with a special chloroprene rubber cover. The new and improved formula maintains its durability even in extreme temperatures, providing added protection from road dirt or salt and allowing continued free movement of the ball joint for a longer lasting part.

Three-year warranty – available in UK

As a guarantee of our OE-quality standards, we offer a three-year or 36,000-mile warranty on all our ball joints. So, you can fit Delphi steering parts with complete confidence.

Cataphoretic coating

Like many of our steering parts, Delphi ball joints feature an environmentally friendly cataphoretic coating for tougher and longer lasting protection from corrosion caused by salt, dirt and water and other contaminants.


Tech Tip

Delphi is advising technicians to help ensure a quality steering and suspension repair by replacing the entire ball joint component where the rubber boot is split, cracked, damaged or missing. In these instances, there is a high probability that damage to the ball joint may have occurred, indicating the joint is likely to fail even after the boot cover has been replaced. Replacing the entire ball joint component can help avoid potential premature failure, which can be safety-critical and costly.

By replacing the boot only and not the complete ball joint unit, the rubber boot could potentially seal in the damaging substances the joint has been exposed to, resulting in accelerated rust and corrosive damage to the joint. In addition, the ball joint is designed to operate with a grease lubricant.

A defective boot could lead to a loss of this essential lubrication, as it may be washed away with water, dry out or become coated with dirt and other debris.


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The Delphi Difference

  • 100 years of OE experience, supplier to the world’s top automakers
  • OE heritage and knowledge built into every aftermarket part
  • Comprehensive portfolio for a wide range of vehicles and model years
  • Streamlined SKUs for easy inventory management
  • Support through tools, tips and training

Related product resources and downloads


Steering & Suspension Quality Test Results

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Maintenance Solutions Steering & Suspension Technical Tip 3 min read

Resource Highlights

In this article you will find out about our Steering & Suspension Quality Test Results.

  • Ball-pin rotational and break-away torque test

    The rotational test measures the force required to rotate the ball-pin within the housing and validates the smooth movement of the steering joint. The break-away test measures the force required to move the ball-pin when the steering wheel turns. Delphi matched the OE part in both torque tests. The competitors ranged from below the accepted range to four times the torque required. With higher torque values than the OE, steering can be stiff and difficult to self center after turning, rendering the vehicle unpredictable. If less than the OE, the steering could feel loose and unstable.

  • Ball joint push out test

    Measures the force required to push out/remove the ball-pin from the housing. It is an important safety check to ensure the part can withstand forces applied to the vehicle suspension system in real road conditions. If the force required to push the ball-pin out from its housing is below the OE requirements, there is a risk the joint could fail. Delphi performed within the one percent tolerance required.

  • Ball-pin angular movement test

    If the ball-pin angular movement is lower than the OE specification, it could restrict the movement of the steering or the suspension, causing excessive stress on other system components and leading to premature failure of the parts. In this test, Delphi matched the OE specifications.

  • Ball joint pull out test

    Measures the force required to pull the ball-pin out from the housing. If the force required to remove the ball-pin is below the OE spec, there is a risk the joint could fail during normal driving conditions causing the vehicle to lose directional control, as the wheel hub would no longer be anchored to the suspension arm. Again, Delphi performed within one percent required of the OE specs.

  • Link stabilizer tensile strength test

    Validates the product housing and welding strength by applying force through the center of the housing until breakage occurs. Breakage should not happen at the points where the bar is welded to the housing. If the tensile strength of a link stabilizer is below the OE, there is a risk of premature failure resulting in vehicle instability and a knocking noise when driving the vehicle. Due to Delphi’s welding process and material specification, the link stabilizer performed to OE specifications.

  • Rubber to metal durability test

    Confirms the integrity of the part design and manufacturing process used to make it. After 220,000 test cycles, the Delphi bush remained intact with a small amount of rubber cracking. In contrast, one competitor suffered a complete failure of the bonding in less than 30,000 cycles. This can result in the failure of the component assembly into which it is installed.

Delphi steering and suspension parts quality test results

As part of its commitment to maintaining OE integrity on every one of its parts, Delphi recently conducted quality test results on its steering and suspension parts together against original equipment and key European competitor parts. Measuring for torque, movement, durability and strength integrity, tests were performed on ball joints and link stabilizers with Delphi matching or remaining within tolerance of OE specifications, while competitor results varied.

Delphi engineers carry out dimensional analysis to ensure geometric compatibility between the OE and aftermarket product, together with stringent analysis of the chemical composition and mechanical properties of the materials used. Further product testing is employed during the manufacturing process including material and dimensional checks, crack detection, and corrosion testing.

All Delphi parts produced adhere to its global technical requirements, whether destined for OE manufacturers or aftermarket customers. All parts released for the aftermarket undergo the same rigorous product development processes, including Production Part Verification (PPV) and Production Part Approval Process (PPAP). The purpose of PPV is to confirm the part being produced performs exactly as the prototype was designed, and the purpose of the PPAP is to ensure every part meets all of the requirements defined in the engineering samples. For example, the steering and suspension ball joint tests specifically focused on strength and durability performance. Both are critical to provide drivers a safer diving experience.

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