High-Quality Four-Corner Welded Nut
I. Core Advantages
1. Precise Structural Design, Strong Welding Stability
The product adopts an integrated four-corner molding structure. Compared to traditional hexagonal nuts, the four-corner design increases the contact area with the workpiece, resulting in more even force distribution during welding and effectively preventing welding deformation and displacement. A pre-drilled welding guide groove at the bottom of the nut facilitates even filling of the solder, forming a strong weld joint and ensuring the sealing and vibration resistance of the connection. Even under high-frequency vibration and heavy-load conditions, it maintains a stable connection and is not prone to loosening.
2. Premium Material Selection, Superior Strength and Performance:
We select high-strength base materials such as premium carbon steel (Q235, 45# steel) and stainless steel (304, 316L), undergoing rigorous material testing and screening to ensure that the carbon content and alloy composition of the raw materials meet international standards. Through precision heat treatment processes such as tempering and quenching, the product hardness reaches HRC35-45, tensile strength ≥800MPa, and yield strength ≥640MPa, capable of withstanding heavy loads, high pressures, and other complex working conditions, meeting the requirements for high-strength industrial-grade connections.
3. Precision Machining Process, Stringent Dimensional Accuracy:
Utilizing imported German cold heading machines, high-precision thread rolling machines, and laser dimensional measuring instruments, we achieve fully automated production and inspection. The threads are processed using precision rolling technology, resulting in clear tooth profiles and tolerances controlled within ±0.01mm, ensuring a tight fit and eliminating the risk of stripping. The accuracy error of key dimensions such as the four corner lengths and thickness is ≤0.02mm, ensuring precise fit with the welded workpiece and improving assembly efficiency. The surface can be treated with various anti-corrosion processes such as galvanizing, nickel plating, Dacromet coating, and blackening. Salt spray testing can last for 48-120 hours, effectively resisting harsh environments such as humidity and corrosion, extending product lifespan.
4. Convenient and efficient installation, adaptable to various scenarios.
The product design is compatible with various welding methods such as resistance welding, arc welding, and gas shielded welding, making operation simple and convenient, significantly reducing assembly time. After welding, the nut and workpiece form an integrated structure, eliminating the need for additional fasteners and saving installation space, especially suitable for assembly scenarios with limited space. Furthermore, it supports customization of different specifications and sizes according to customer needs, with thread sizes covering M4-M20 and thicknesses ranging from 3mm to 20mm, adapting to the connection needs of workpieces of different thicknesses and materials, offering extremely high flexibility.
II. Applicable Scenarios
- Automotive Industry: Fixed connections for body frames, chassis components, engine mounts, etc.
- Machinery Manufacturing: Connections between housings and parts of general mechanical equipment, machine tools, and construction machinery;
- Rail Transit: Installation and fixing of rail vehicle body structures, interior parts, and electrical equipment;
- Home Appliance Manufacturing: Sheet metal structure connections for home appliances such as refrigerators, air conditioners, and washing machines;
- Steel Structure Engineering: Welding and fixing of light steel structures, equipment supports, etc.
III. Quality Assurance System
Ningbo Mohai Fasteners consistently implements quality control throughout the entire production process. Our four-corner welded nuts strictly adhere to the ISO9001 quality management system standard. From raw material entry and production process monitoring to finished product delivery, they undergo 12 rigorous inspections, including material testing, hardness testing, thread accuracy testing, welding strength testing, and salt spray corrosion testing, ensuring a 100% product qualification rate. The company has a professional technical R&D team that can provide customized product design and technical support based on customers' specific working conditions, offering integrated service guarantees from product selection and welding process guidance to after-sales quality tracking.
Ningbo Mohai Fasteners' four-corner weld nuts, with "precision, strength, and durability" as their core values, have been exported to more than 50 countries and regions worldwide, winning widespread recognition from customers both domestically and internationally, thanks to their superior product quality and professional service system. We consistently adhere to the philosophy of "meticulously crafting quality and building a brand with integrity," providing more reliable and efficient connection solutions for the global industrial sector.
