From Component Supplier to Engineering-Grade Fastening Solution Partner Over a Decade of Cooperation
1. From “Qualified Supplier” to “Engineering Partner”
Before 2012, key fastening components for China’s heavy-haul railway and energy infrastructure relied heavily on imported products. Domestic high-strength fasteners struggled to satisfy requirements for fatigue life, anti-loosening performance, and extreme temperature/pressure environments.
With extensive experience solving vibration and dynamic impact issues for the railway sector, Tianjin Longshi Fasteners successfully supported the national expansion of heavy-haul transportation and energy engineering projects.
Through advantages in metallurgical control, reinforced structural design, and fatigue testing capability, Longshi evolved from a “component supplier” to a provider of complete fastening engineering solutions.
2. Representative Projects and Engineering Solutions
🔹 Case 1 — Shuohuang Railway: 30,000-ton Heavy-Haul Transportation
Project Challenges
- Single train weight up to 30,000 tons
- Continuous high-frequency vibration + impact load
- Standard Grade 10.9 bolts loosened within 10–20 days, requiring frequent shutdown maintenance
Longshi Engineering Solution
| Technical Focus | Solution |
|---|---|
| Raw Material Upgrade | 35CrMo▶ optimized to 40CrNiMoA for higher fatigue limit and fracture toughness |
| Structural Design | Reverse-slip anti-loosening groove + precision matched nut pair |
| Surface Treatment | Zinc-nickel 1000h industrial anti-corrosion coating to prevent hydrogen embrittlement |
| Validation | 1,200,000-cycle vibration fatigue test + repeated impact torque test |
Results & Value
- Maintenance cycle increased 15 days → 60 days
- Failure rate reduced 92%
- Significant savings in operational cost and downtime
- 1,000,000+ sets supplied, recognized as long-term preferred model
🔹 Case 2 — Zhundong Coal-to-Natural Gas Project (Extreme High-Temperature & Pressure)
Project Challenges
- Operating temperature > 300°C, pipeline pressure > 10 MPa
- Sulfur-rich environment caused rapid corrosion + stress cracking in regular zinc-coated bolts
- Shutdown replacement is extremely costly
Longshi Engineering Solution
| Technical Focus | Solution |
|---|---|
| Material Grade | 35CrMoA with vacuum quenching + tempering for structural stability |
| Thread Processing | Cold-rolled thread improves grain flow and fatigue resistance |
| Surface Protection | PTFE + metallic high-temperature corrosion-resistant coating |
| Standards | Fully compatible with ASME high-pressure bolting standards, with torque data provided |
Results & Value
- Service life ≥ 3× longer than common market solutions
- Shutdown replacement cycle 9 months → 26 months
- Eliminated combined risk of high temperature + high pressure + corrosion
🔹 Case 3 — Utility-Scale Solar Photovoltaic Project
Project Challenges
- Outdoor exposure to sandstorm, humidity, and salt spray
- Once loosened, modules can shift or collapse
- Standard fastening solutions had insufficient corrosion resistance for 20-year lifecycle
Longshi Engineering Solution
- A4-80 stainless steel + creep-resistant mechanical structure
- Gradient lock-tooth anti-loosening nut
- 72-hour wind-vibration simulation + 1500-hour salt spray test
- Modular packaging for rapid on-site installation
Results & Value
- Guaranteed 20-year PV structure lifecycle
- Achieved wind-resistance rating for Category 15 typhoon conditions
3. More Than Bolts — A Complete Engineering Fastening Solution System
| Capability Module | Output |
|---|---|
| Engineering Consulting | Working condition analysis, fastening structure selection |
| R&D Customization | Non-standard / extreme-condition materials & structural design |
| Testing & Verification | Fatigue testing, torque coefficient, anti-corrosion evaluation, vibration impact test |
| Quality Traceability | Full traceability with certification and inspection reports |
| O&M Support | Failure analysis and bolt replacement recommendations |
These capabilities enabled Longshi Fasteners to become a long-term strategic cooperation partner of China Energy Group.
4. Future Strategic Development
| Direction | Technical Focus |
|---|---|
| Wind / Offshore Wind | Ultra-high corrosion-resistant coating + extended service life |
| Hydrogen Energy | Bolt material research for -253°C cryogenic working environments |
| Smart Fastening | Real-time preload monitoring sensor bolt |
| Digital Supply Chain | Planned ERP system integration for smart replenishment |
Longshi’s core mission: reducing downtime, enhancing safety, and lowering lifecycle maintenance costs for engineering clients.
5. Brand & Global Outreach Channels
- 🌐 Official Website (Independent Site): www.lsfasteners.com
- 🏭 Made-in-China Store: Product catalog, case studies & certifications
- 🌍 Social Media Channels: LinkedIn | Facebook | YouTube | VK → Sharing production videos, third-party testing, engineering cases & customer testimonials
Conclusion
More than ten years of collaboration have proven that the value of Longshi Fasteners lies not only in manufacturing high-strength industrial fastening products, but also in diving deep into engineering scenarios, solving real customer problems, and continuously improving system reliability.
Going forward, Tianjin Longshi Fasteners will continue to support the upgrading of national energy projects and contribute to global energy infrastructure with the combined strengths of
Manufacturing + Engineering + Digitalization.
Post time: 2025-11-26 00:00:00