Zinc Plated Slotted Hex Lock Nuts

Zinc Plated Slotted Hex Lock Nuts belong to split cotter pin locking fasteners, which rely on top open slots to install cotter pins for anti-loosening protection. As a professional fastener manufacturer, Ningbo Gangtong Zheli Fasteners Co., Ltd. strictly controls raw material and surface treatment standards for all finished fasteners. The base material is standard medium carbon steel, the electroplated zinc layer thickness reaches 5μm minimum, and the production process abandons hexavalent chromium passivation to meet global environmental import standards. The internal thread of all finished fasteners is rolled by precision thread rolling equipment, with smooth tooth surface and high matching accuracy with standard bolts.

Manufacturing & Quality Inspection System

Ningbo Gangtong Zheli Fasteners Co., Ltd. builds a closed-loop production workshop dedicated to fastener processing, covering stamping, thread rolling, galvanizing and finished product sorting links for this series of fasteners. All raw steel materials are supplied by domestic certified steel mills, with complete MTC material test reports provided for each batch to trace the source of steel. The factory adopts standardized sampling inspection rules: 3‰ of finished Zinc Plated Slotted Hex Lock Nuts are randomly selected for salt spray test, thread size detection and hardness test. The qualified salt spray resistance of standard galvanized products can reach 48 hours without white rust, which meets the anti-corrosion requirements of most mechanical assembly environments.

Product Performance & Structural Advantages

All sizes of Zinc Plated Slotted Hex Lock Nuts cover multiple common thread sizes, which can be perfectly matched with high-strength bolts of corresponding specifications for mechanical assembly. The internal threads of products are integrally formed by precise thread rolling technology with neat tooth profile and no burrs, ensuring high tightening accuracy and stable locking force. The unique top slotted structure allows cotter pin installation to form double anti-loosening protection, effectively avoiding fastener loosening and displacement caused by long-term mechanical vibration and frequent equipment operation. The whole product adopts eco-friendly electro-galvanized treatment with a stable coating thickness of more than 5μm, and complies with hexavalent chromium-free passivation standards. Qualified products can pass 48-hour neutral salt spray test stably, effectively resisting oxidation and rust in conventional indoor and mild outdoor working environments. Multiple strength grades are available for customized production, and complete MTC material certificates and 3.1 inspection documents can be provided to meet international engineering procurement standards.

Wide Application & Optional Surface Treatments

This kind of fastener is widely used in general machinery, pipeline fixing, engineering equipment and other assembly fields. The unique slotted locking structure can effectively solve the hidden danger of fastener loosening caused by long-term mechanical vibration. Except for conventional electro-galvanized surface, we can also provide black oxide, stainless steel polishing, hot-dip galvanized surface treatment options to adapt to different working conditions such as indoor dry environment, humid outdoor environment and heavy-duty anti-corrosion projects. The practical value of Zinc Plated Slotted Hex Lock Nuts is recognized by engineering buyers from all over the world.