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North Ring Road Industrial Zone, Yongnian District, Handan City, Hebei Province
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Hadlock anti loosening nut
Hadlock anti-loosening nut is a high-end all-metal self-locking fastener with a patented wedge principle design, known as the "never-loosen nut" in the industry.
Hadlock anti-loosening nut is a high-end all-metal self-locking fastener with a patented wedge principle design, known as the "never-loosen nut" in the industry. It consists of a convex (eccentric) nut and a concave (concentric) nut. By virtue of precise wedge engagement, it completely eliminates thread gaps, providing extreme anti-loosening performance under strong vibration, impact and alternating load conditionsHARDLOCK NUT. Widely used in high-speed rail, bridges, wind power, mining and other key infrastructure fields.
Material & Construction
◆ Material: High-strength carbon steel, alloy steel, stainless steel (SUS304/SUS316) ◆ Structure: Dual-nut combination (eccentric convex nut + concentric concave nut) ◆ Surface treatment: Black oxide, electro-galvanized, hot-dip galvanized, stainless steel passivation ◆ Standard: Metric (M6–M48), compliant with NAS3350/3354, ISO 16130, Junker test standards ◆ Core technology: Precision eccentric wedge processing, fully metal self-locking (no nylon, no glue)
Core Advantages
◆ Extreme anti-loosening performance Withstands millions of high-frequency vibrations; residual axial force remains above 90% of the initial value, far exceeding ordinary locknuts (typically below 30%). Passes strict NAS aerospace vibration tests without loosening. ◆ Wedge self-tightening mechanism The more severe the vibration, the tighter the wedge engagement; converts external vibration energy into locking force, achieving "the more shaken, the tighter" effect. ◆ Reusable & durable All-metal design with minimal wear; can be repeatedly disassembled and assembled without reducing locking performance。 Resists aging and maintains stability in -50℃ to +150℃ environments. ◆ No auxiliary parts required Works without spring washers, nylon inserts or thread-locking adhesives; installs with standard wrenches, same as ordinary nuts. ◆ High safety & cost-effectiveness Virtually zero failure rate in critical applications; reduces inspection and maintenance costs by over 90% for long-term use.
Common Specifications
◆ Type: Standard hexagon Hadlock nut, heavy-duty series, flange series ◆ Size: M6, M8, M10, M12, M16, M20, M22, M24, M30, M36, M42, M48 ◆ Matching: Compatible with standard metric bolts (Grade 8.8/10.9/12.9)
Application Scope
◆ Rail transit: High-speed rail, railway locomotives, track fastening systems ◆ Energy industry: Wind turbine towers, power equipment, oil and gas pipelines ◆ Construction & bridge: Steel structure bridges, large stadiums, high-rise buildings ◆ Mining & tunnel: Mine roadway support, underground engineering anchoring systems ◆ Heavy machinery: Engineering machinery, port equipment, military equipment connections
About Us
Hebei Tianlong Fastener Co., LTD., founded in 2006, has been deeply engaged in the field of fastener manufacturing for 18 years, and is a modern enterprise integrating scientific research and development, intelligent manufacturing, global marketing and technical services.
The company has always adhered to the innovation-driven development strategy, through systematic talent training, forged a core team composed of senior engineers, innovative technicians and industry elites, combined with advanced management system, automatic machining center and intelligent testing system, to build a full chain of excellence guarantee system through research and development, production and quality control. Continue to provide customers with high-precision, high-strength, high-stability fastening solutions.
Exhibition
FAQ
How long has Tianlong Fastener been in the fastener manufacturing industry?
We have over 18 years of professional experience since our founding in 2006.
What core capabilities does Tianlong Fastener have?
We integrate R&D, intelligent manufacturing, global marketing and technical services.
Does Tianlong Fastener offer standard fastener products?
Yes, we supply 8.8/10.9/12.9 class bolts/nuts complying with GB, DIN, ASTM, BS, JIS, ISO.
Can Tianlong Fastener provide custom fastener solutions?
Absolutely, custom services are our core strength for special demands.
What custom materials can the fasteners be made of?
We customize fasteners with stainless steel, copper, aluminum alloy and other special materials.
