High-Strength Carbon Steel 1/4-20 Inches DIN6923 Hex Serrated Flange Nuts Fasteners with Hot-DIP/Electro-Galvanized Finish for Anti-Loosening

High-Strength Carbon Steel 1/4-20 Inches DIN6923 Hex Serrated Flange Nuts Fasteners with Hot-DIP/Electro-Galvanized Finish for Anti-Loosening. API-20E Authorized: Officially licensed by the American Petroleum Institute for BSL-1 & BSL-2 oil & gas applications. Full In-house Lab: Zero third-party reliance; complete OES, mechanical, and MPI crack detection in-house. 100% Traceability: Every shipment is guaranteed with full EN 10204 3.1 MTR documentation. 5 automated heat treatment lines ensure uniform hardness and performance across bulk orders. Advanced Protection: Superior corrosion resistance (PTFE, HDG, Dacromet) proven by 1000h+ salt spray tests. Zero-Defect Capability: Precision CNC centers and optional automated optical sorting for zero-error delivery. ISO Triple Certified: Fully compliant with ISO 9001 (Quality), ISO 14001 (Environmental), and ISO 45001 (Safety). 1,800T Monthly Capacity: High-volume scalability from a 30,000 $m^2$ facility for major infrastructure projects. Smart 3D Warehouse: 10,000-ton capacity WMS for real-time stock accuracy and fast, on-demand fulfillment. Workflow Integration: Fully customizable labeling (barcodes/parts) and packaging (kitting) to match your ERP system.