5-Point Quality Control Checklist for Industrial Hardware

International tool importers and brand distributors must establish rigorous Quality Control (QC) standards at factory acceptance. Here are EVEROK's 5 non-negotiable inspection standards:

1. Drop-Forging Integrity & Grain Flow Examine the steel cross-section under optical microscopy. High-grade drop-forged tools must display continuous grain flow aligned with the tool axis, eliminating micro-voids, cold shuts, and surface decarburization.

2. Hardness Consistency Across Working Zones For cutting pliers and adjustable wrenches: - Jaw teeth must reach **HRC 58-62** (induction hardened). - Tool body / handles must maintain **HRC 42-48** to absorb dynamic shock without brittle fracture.

3. Electroplating Thickness & Salt Spray Testing - Minimum nickel layer: **8–10 μm**. - Chrome top coat: **0.25–0.35 μm**. - Must exceed **72-hour neutral salt spray test (NSS)** according to ISO 9227 without pitting or corrosion.

4. Torque Proof-Load Compliance All sockets and wrenches must exceed **DIN 3117 / ISO 6787** proof-torque ratings by at least **150%** without permanent jaw opening exceeding 0.1mm.

5. Packaging & Drop Durability Blow-mold cases and blister hang-cards must withstand a 1.2m drop test at -10°C to guarantee transit safety across intermodal maritime containers.