Import Custom Black Hexagon Lock Nuts — Buy in wholesale FOB from Supplier in China

Custom Black Hexagon Lock Nuts from Wenzhou Yuanzhi Auto Parts Co. Ltd are precision-engineered fasteners designed for high-vibration applications in automotive, machinery, and industrial equipment. The nuts are manufactured from C70, 65Mn, carbon steel, alloy steel, stainless steel, or brass, with sizes ranging from M3 to M48 and imperial equivalents up to 3/4 inch. Surface finishes include black oxide, zinc plating in clear, blue, yellow, or black, nickel plating, and hot-dip galvanizing, selected based on corrosion resistance and aesthetic requirements.

These nuts comply with international standards including GB, DIN, ISO, ANSI/ASTM, B7, BS, BSW, and JIS, ensuring interchangeability across global supply chains. Heat treatment processes such as tempering, carburizing, and quenching are applied to achieve specific hardness levels, typically between 30-40 HRC for carbon and alloy steel variants. The black oxide finish provides mild corrosion resistance and a matte appearance preferred in mechanical assemblies where visual uniformity matters. Standard tolerances follow ISO 2768-mC for general purposes unless otherwise specified by the customer.

Buyers in automotive assembly, heavy machinery, and aerospace maintenance use these nuts for secure fastening under dynamic loads. The supplier accepts small orders and supports OEM and ODM requests, making them suitable for prototyping and niche production runs. Packaging is available in 100 to 1000 pieces per bag with labels, packed in export-standard cartons. Loading occurs from Ningbo or Shanghai ports, with payment terms of 30% advance and 70% before shipment. Delivery is supported by strong production capacity and stock availability.

Wenzhou Yuanzhi Auto Parts Co. Ltd operates from Wenzhou Economic and Technological Development Zone in Zhejiang Province, China. The company specializes in manufacturing flange lock nuts and related fasteners, with documented production capabilities and testing infrastructure including hardness testers, salt spray chambers, and 3D measurement systems. The listing confirms sample availability and OEM/ODM support but provides no details on workforce size, annual output, or client list.

The supplier holds ISO 9001:2015, IATF 16949:2016, and ISO 14001:2015 certifications, indicating a documented quality and environmental management system. Response rate and average response time are not available on the listing, and no third-party verification badges are displayed. The address is precise and matches public industrial zone records, supporting legitimacy. No claims are made about export volume, years in operation, or production capacity beyond general statements of stock availability.