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Quality assurance
A steering or suspension part that fails does not just cost a warranty claim — it costs your customer's trust. Our controls are built around preventing that, not around inspecting it out at the end.
Control points
Where the checks happen
Quality is controlled at each stage where a defect could be introduced or could escape. The list below reflects the checks applied to our steering and suspension range.
Incoming material
Steel grade and hardness verified on receipt. Rubber compounds checked for hardness and ageing properties before release to production.
Forging & forming
Forming dimensions and surface condition monitored per batch, so downstream machining starts from a consistent blank.
Machining
Taper, thread pitch and critical diameters measured against drawing. Threads rolled rather than cut where the drawing calls for it, for higher fatigue strength.
Heat treatment & surface
Hardness and case depth confirmed. Surface treatment checked for coating thickness and adhesion.
Assembly
Ball seat fit, dust boot seating and grease fill controlled. Torque checked on assembled joints.
Final inspection
Dimensional check, visual check, swing torque and, where specified, salt spray testing on coated parts.
Testing
What we test for
Dimensional accuracy
Taper angle, thread size and length verified against drawing. Taper mismatch is the most common cause of a part that "does not fit" — it is checked on every batch, not sampled once.
Corrosion resistance
Neutral salt spray testing on coated components. Results depend on coating specification and are stated per product, not claimed as a blanket figure across the range.
Joint torque
Swing torque measured on ball joints and link assemblies, so the part moves freely in service but is not loose.
Pull-out strength
Stud pull-out and housing retention tested to confirm the joint holds under suspension load.
Rubber properties
Hardness, tensile strength and ageing resistance on bushings and boots — the parts that fail first when the compound is wrong.
Batch traceability
Production batches recorded so that if an issue appears in the field, the affected production window can be identified precisely.
If something goes wrong
Complaint handling
Report it
Send the DAPU model number, quantity, batch reference, photos and a description of the failure.
We investigate
We check the retained records for that batch and examine returned samples if available, then report back with a cause.
We correct it
Replacement or credit for confirmed defects, plus a change to the process if the cause is on our side.
We would rather hear about a problem early than have it discussed in a customer's workshop six months later.
Need our quality documentation?
Ask for inspection reports, material certificates or packaging specifications for the models you are considering.