Global bulk buyers need to carry out quality inspection before accepting fastener shipments. We prepare a practical inspection checklist for anchors, bolts and screws.
First, check dimension tolerance: thread diameter, length, head size, embedment dimension. Second, verify surface coating: coating thickness, galvanizing uniformity, no blister or peeling. Third, mechanical test: tensile strength, yield strength, hardness test for high strength fasteners.
Fourth, document check: material test certificate, factory test report, batch number. Fifth, visual inspection: no crack, deformation or thread damage.
Keep this checklist for incoming goods inspection, to avoid defective fasteners entering construction sites.