Quality Control System for Micro Precision Screws: How We Guarantee Consistent Product Quality

For micro precision screws, tiny dimensional errors will directly affect the assembly effect and product performance. As a professional manufacturer, Changzhou Kaihua Precision Screw Manufacturing Co., Ltd. builds a complete multi-stage quality control system for micro screws, to ensure every batch of delivered fasteners maintains stable and consistent quality.

Our quality control starts before production, starting from raw material incoming inspection. All metal raw materials for producing micro screws will be tested for material composition, hardness and mechanical performance when entering our factory. Unqualified raw materials will be rejected directly and will not be put into production. Different raw materials have different mechanical properties. Our QC team will cross-check the raw material certificate to ensure the material fully matches the customer’s order requirements.

During the production process, real-time inline inspection is implemented. Micro screws are small in size and high in precision requirement. Operators and QC inspectors carry out periodic sampling at each production workstation. The inspection items include thread integrity, screw length, outer diameter, head size and surface appearance. Any defective products such as burrs, deformed threads and size out of tolerance will be picked out immediately to prevent defective products flowing into the next production link.

After the screws are formed, surface treatment inspection is carried out. For electroplating, passivation and other surface treatment processes, we check coating thickness, coating uniformity and anti-corrosion performance. Poor surface treatment will lead to rust, coating peeling and reduced service life of micro screws. We strictly control the whole surface treatment process to meet customers’ environmental and anti-corrosion requirements.

Before delivery, finished products will undergo final full sampling inspection. We test mechanical properties including tensile strength and torque resistance to verify whether the micro screws can meet the load requirement in actual assembly.

Besides mechanical and dimensional inspection, we also carry out hazardous substance testing for micro precision screws. We cooperate with qualified third-party testing laboratories. The test covers soluble heavy metals and phthalate substances. Our test result shows all detected items are ND (not detected), fully complying with international environmental requirements. The complete test report can be provided to customers for product certification and customs clearance.

We also implement batch management for all orders. Each production batch has independent batch number and complete production and inspection records. If customers have any quality inquiries after receiving goods, we can quickly trace back the raw material batch, production time and inspection records.

Many factories ignore the packaging inspection of micro screws. Micro screws are tiny and easy to be mixed with impurities or scratched. We use professional moisture-proof packaging for finished screws. Before packing, QC staff check the product quantity and appearance again to avoid mixing different specifications of screws.

Our quality team keeps optimizing inspection standards according to customer feedback and international industrial requirements. We treat both small sample orders and large bulk orders with the same strict QC standards. We believe stable and controllable quality is the core competitiveness of micro precision screw manufacturers.

When you cooperate with Changzhou Kaihua Precision Screw Manufacturing Co., Ltd., you will receive micro precision screws with stable quality, complete inspection records and environmental compliance reports. If you want to know more about our quality inspection standards or arrange sample testing, please contact our sales team.