Insulator stud bolts are an indispensable fastening component in high-voltage power transmission and transformation systems, and are designed specifically for fixing insulators, connecting conductors and power towers. Both ends of the stud bolts have precision threads, which can achieve bidirectional and stable locking, and are suitable for the installation of power facilities in various extreme environments. The stud bolts produced by Handan Jinmai are made of high-strength materials and advanced processes to ensure that they can maintain excellent mechanical properties and electrical insulation properties under harsh conditions such as high temperature, high humidity, and strong corrosion. They are widely used in power grid construction, railway contact networks, and communication base stations.
1. Excellent material
Made of high-strength alloy steel or stainless steel, with a tensile strength of more than 800MPa, it has both toughness and durability.
2. Precision structural design
Double-ended full thread + middle light rod design facilitates multi-angle installation and adjustment, reduces stress concentration, and extends service life.
3. Anti-corrosion surface treatment
Adopting hot-dip galvanizing, Dacromet or epoxy coating process, the salt spray test is over 1000 hours, and it is suitable for high-corrosion environments such as coastal areas and industrial areas.
4. High-precision processing
The thread tolerance strictly complies with ISO 965 standards, and the matching accuracy reaches 6g/6H level, ensuring seamless fit with nuts and washers.
5. Diversified specifications
Supports customization of diameters from M12 to M36 and lengths from 50mm to 500mm to meet the engineering needs of different voltage levels (10kV-1000kV).
6. Anti-aging performance
After passing the UV aging test, the insulation layer has no cracking or powdering under long-term outdoor exposure, ensuring electrical safety.
Handan Jinmai implements ISO 9001 quality management system and strictly controls the whole process:
1. Raw material screening: imported spectrometer detects steel composition to ensure accurate ratio of carbon, chromium, molybdenum and other elements.
2. Precision forging: multi-directional die forging process improves metal density and eliminates internal defects.
3. CNC thread processing: CNC machine tool turns thread with accuracy of ±0.01mm and surface roughness ≤Ra3.2.
4. Quenching and tempering heat treatment: quenching + tempering double process to optimize hardness (HRC 28-32) and fatigue resistance.
5. Environmentally friendly surface treatment: fully automatic electroplating line achieves uniform coating, in line with RoHS environmental protection standards.
6. Fully inspected before leaving the factory: passed torque test, magnetic particle inspection and salt spray test, 100% quality traceability.
The insulator stud bolts are made of high-strength alloy steel or stainless steel, in accordance with ISO 898-1 and ASTM A193 standards, with diameters ranging from M12 to M36, and lengths that can be customized from 50mm to 500mm according to customer needs. The tensile strength is ≥800MPa, the yield strength is ≥640MPa, and the surface treatment can be hot-dip galvanizing (average coating thickness ≥50μm), Dacromet (coating thickness 8-12μm) or epoxy resin spraying (voltage resistance ≥15kV). The product has passed CE certification and IEC 61284 international standard testing, with an operating temperature range of -50℃ to +300℃, and is suitable for extreme environments below 4500 meters above sea level and humidity ≤98%.
As a leading enterprise in China's power hardware industry, Handan Jinmai Fastener Manufacturing Co., Ltd. has been deeply involved in the fastener field for more than 20 years. With its independently developed automated production line and national laboratory testing capabilities, it provides high-reliability insulator studs for power, communication, and transportation projects in more than 50 countries around the world. Our products are aimed at "zero defect delivery" and can be traced from material procurement to finished product delivery. We are committed to creating low-cost and high-efficiency fastening solutions for customers throughout the life cycle.
Choosing Handan Jinmai means choosing:
✅ Quality assurance that meets international standards
✅ 7×24-hour rapid response technical service
✅ One-stop customized production support
Contact us: Get ground rod technical solutions and export quotations immediately to lay a solid safety foundation for your global projects!
Official website: https://www.jinmaipowerline.com/
Email: [email protected]
Contact: WhatsApp/wechat: +86 13831001495
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