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ASTM A194 2h /A563 Heavy Hex Nuts. Integrated Manufacturer: Owns 18,000 sqm facility for high-quality fastener production. Wide Size Range: Sizes from M10 to M100, covering 1/4' to 4' diameters. Multiple Certifications: Certified by API, ISO9001, CPR, PED, and Ad2000. Custom Surface Coating: Options include Black, Zinc, HDG, Phosphated, and Dacromet. Rigorous QA System: Two-stage protocol: pre-production checks and full batch inspection. OEM/ODM Service: Welcome custom orders for non-standard and specialty parts. Flexible Payment Terms: Supports FOB, CIF, EXW, SWIFT TT, D/P, and LC at sight. Fast Lead Time: Off-season delivery within 15 workdays; peak season one month.