How to Source Control Arms, Ball Joints & Tie Rod Ends from China

Short answer: control arms, ball joints, tie rod ends and sway bar links are load-carrying chassis parts, so the price per unit matters less than three things: an exact OEM match (side, position and whether the arm is sold bare or as an assembly with the ball joint and bushings already fitted), the construction of the joint (housing, stud, seat and dust boot), and sample testing against the OEM part before volume. Most of these parts enter the US under HTS heading 8708 at a 2.5% general rate — suspension parts under 8708.80 and steering parts under 8708.94 — plus whatever China-specific duties apply at the time you import.

PartzealHQ lists OEM numbers, fitment and factory listings for control arms, ball joints, tie rod ends, sway bar links and sway bar bushings. This guide is the checklist to use before you contact factories.

Should I buy a bare control arm or a complete assembly?

Control arms are sold either bare (the arm only, so the ball joint and bushings are pressed in by the installer) or as a complete assembly with the ball joint and bushings fitted. The two have different OEM numbers in many applications and are not interchangeable in a quote. Before you request prices:

• Confirm the OEM number for the exact configuration — front or rear, upper or lower, left or right, and the model-year and trim range. Check fitment against a VIN where you can (VIN decoding for parts sourcing).
• Write "assembly with ball joint and bushings" or "bare arm" into the specification and ask the factory to confirm which it is quoting.
• Ask which construction the arm uses — stamped steel, forged or cast aluminum, or cast iron — and confirm it matches the OEM part. A different material changes weight, stiffness and corrosion behavior.

Sway bar links and tie rod ends are simpler, but the same rule applies: inner versus outer tie rod end, left versus right thread, and front versus rear link are different part numbers.

What should the specification say about the joint?

The ball joint is the part of the assembly that wears. Ask each factory to state, in writing:

• Housing — material and forming method (forged or cast), and the surface treatment.
• Ball stud — material, heat treatment, taper dimensions and thread size, and the tightening torque the stud is designed for.
• Bearing seat — the material of the socket liner (for example, a polymer seat).
• Dust boot — boot material and how it is retained on the housing and stud. A torn or loose boot lets water and grit into the joint.
• Greasing — sealed-for-life or with a grease fitting, as the OEM part is.
• Bushings (for arm assemblies) — rubber or polyurethane, and whether the bushing is bonded or pressed.
• Corrosion protection — coating type and the salt-spray test the factory uses (for example a neutral salt spray test to ISO 9227), with the number of hours it claims.

Ask for the test reports behind any numbers the factory quotes — typically stud pull-out force, articulation and rotation torque, and salt-spray hours — with the lab, date and tested part number. If a factory cannot produce reports for the exact part, test the samples yourself.

How do I check samples?

Buy paid samples of the exact part numbers you intend to order, and check them against an OEM part:

1. Dimensions — mounting hole positions, bushing bore and sleeve length, ball stud taper and thread, and overall length for links and tie rods.
2. Fit on the vehicle — the arm should bolt in without force; the stud should seat fully in the knuckle taper.
3. Joint feel — rotation and articulation torque by hand should be smooth and consistent across samples, with no free play.
4. Boot and finish — boot seated and retained, coating even, no bare spots at welds or edges.
5. Marking — origin marking and a batch or date code on the part, so a problem in the field can be traced to a production lot.

The general routine in the sample order checklist and the failure modes in common quality issues in Chinese auto parts apply here too.

How are these parts classified at US customs?

In the USITC Harmonized Tariff Schedule:

• 8708.80 covers "suspension systems and parts thereof (including shock absorbers)"; for passenger vehicles, parts of suspension systems that are not cast iron fall under 8708.80.65 at a 2.5% general rate.
• 8708.94 covers "steering wheels, steering columns and steering boxes; parts thereof"; the passenger-vehicle "other" line 8708.94.75 is also 2.5%.

Whether a particular ball joint, tie rod end or link belongs under the suspension or the steering subheading depends on the part, so confirm the code with your broker and check CBP's CROSS rulings before the first entry. See HS codes for auto parts and, for China-specific duties, US import duties on Chinese auto parts.

What should I ask a chassis-parts factory?

• Do you forge or cast the arm and the ball-joint housing yourselves, or buy them in? Who makes the ball stud?
• Which of the quoted part numbers are bare arms and which are assemblies?
• Can you send test reports for this part number, not for a "similar" part?
• What does your quality certificate cover, and is this product line in its scope? See IATF 16949 vs ISO 9001.
• What batch traceability do you keep on the part and the carton?

What does the PartzealHQ catalog show for these categories?

Each category page lists OEM numbers with the vehicles they fit, the factories that list those numbers on public B2B marketplaces, and the FOB price ranges and minimum order quantities shown in those listings. Price ranges and MOQs are what the listings state, not quotes. As explained on the methodology page, PartzealHQ has not audited these factories or tested their parts, so the checks above still apply to every supplier.

Sources

• USITC Harmonized Tariff Schedule search for 8708.80 and 8708.94 — hts.usitc.gov, retrieved November 2026.
• ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests — iso.org.

This guide is general information, not engineering or customs advice.