Catalog Highlights: Structural Screws & Expansion Hardware
Explore high-strength stainless, hot-dip galvanized, and extruded mounting components built for extreme tensile integrity and shear load reliability.
China Factory 4.0: Supply Chain Resilience & Process Precision
Located in Yongnian, Handan—the undisputed fastener epicentre—our digital manufacturing matrix integrates end-to-end metallurgical control, continuous multi-stage cold heading, and inline automated optical sorting.
Smart Cold Heading & CNC Turning
Our intelligent workshop utilizes multi-station high-speed cold headers coupled with precision 5-axis CNC machining, maintaining dimensional consistency down to microscopic structural allowances.
- Automated inline laser thread inspection
- High-tensile carbon and stainless alloy grades
Corrosion Barrier Engineering
From zinc-nickel alloy micro-plating to Class C5 hot-dip galvanization, surface chemistries are strictly formulated to resist chemical delamination, hygroscopic shear, and galvanic degradation.
- ASTM B117 neutral salt spray cycle verification
- Eco-friendly trivalent chromium passivation
Agile Supply Chain Clustering
Capitalizing on localized upstream smelting plants and rapid multimodal shipping pipelines, Youlong drastically lowers procurement lead-times while absorbing macro-raw material volatility.
- Immediate steel billet reserve allocations
- Direct container freight staging to major sea terminals
Macro-Industry Solutions: Structural Furniture & Infrastructure Fasteners
Whether securing massive commercial modular furniture setups, utility-scale photovoltaic tracker arrays, or seismic-rated concrete envelopes, fastener mechanics dictate structural longevity.
| Application Sector | Primary Substrate Matrix | Recommended Anchor / Screw Architecture | Material & Surface Metallurgy | Target Compliance Standard |
|---|---|---|---|---|
| Commercial & Contract Furniture | MDF, Solid Hardwood, Honeycomb Core, Thin-Wall Steel | Threaded Inserts, Knock-Down (KD) Connectors, Socket Cap Fasteners | AISI 304 / Zinc-Alloy with Passivated Clear Trivalent Finish | BIFMA X5.5 / ISO 7045 |
| Heavy Building Enclosures | C20/25 to C50/60 Cracked & Uncracked Concrete, Masonry | Heavy-Duty Fish Scale Expansion Bolts, Wedge Anchors | Carbon Steel Grade 8.8 / 10.9 HDG, AISI 316 Stainless | ETA Option 1 / ASTM E488 |
| Solar PV & Clean Energy | Extruded Aluminum 6005-T5, Structural C-Steel Purlins | T-Head Bolts, Stainless Carriage Bolts, Mid/End Clamping Bolts | Austenitic SS A2-70 / A4-80 with EPDM Isolating Washers | DIN 933 / ISO 3506-1 |
| Marine & Coastal Infrastructure | Reinforced High-Density Concrete, Structural Composites | Through-Bolts, Expanding Sleeve Drop-In Anchors | AISI 316L Marine Stainless / Multi-Layer Fluoropolymer Barrier | ISO 9223 C5 Marine |
Technical Roadmap: Autonomous Quality & Circular Metallurgy
Youlong's 2026–2030 engineering roadmap pivots on structural micro-alloying, automated robotic assembly compatibility, and traceable product lifecycle compliance.
Low-Carbon Recycled Alloys
Adoption of electric arc furnace (EAF) circular steel billets, dramatically mitigating embodied carbon footprints without conceding core shear resistance or micro-tensile tolerances.
- Environmental Product Declarations (EPD)
- Full Scope 1-3 carbon tracking verification
Smart Self-Locking Architectures
R&D focused on anti-vibration thread geometries (DIN 25201 compatible) mitigating micro-loosening under continuous seismic excitation, thermal swing cycles, and harmonic oscillation.
- Junkers dynamic vibration tested
- Reusable thread-locking micro-coatings
Global Certification & Traceability
Full batch traceability through 3.1 Mill Test Certificates (EN 10204), chemical assay spectrometer readouts, and adherence to EU RoHS, REACH, and US Dodd-Frank Act directives.
- Zero conflict mineral supply chain
- Direct barcode batch origin tagging
Localized Support & Strategic Global Procurement Matrix
Solving complex logistics friction, customs classification obstacles, and high-volume delivery timelines for multinational EPCs, hardware distributors, and OEM assemblies.
Direct Multimodal Logistics
Seamless FOB, CIF, DDP delivery configurations backed by standardized export packing: fumigated pallets, moisture-barrier inner packaging, and automated strapping.
Dedicated Engineering Squads
Bilingual mechanical and metallurgical engineers assist with CAD drawing conversions, non-standard dimensional calculations, and destructive shear simulations.
Flexible Credit & Escrow Options
Scalable commercial credit frameworks for recurring Tier-1 contracts, including Letter of Credit (L/C at sight), TT staged milestones, and secure international escrow arrangements.
Zero-Defect Quality Gates
Every shipment is backed by statistical process control (SPC), high-speed visual camera sorters, and destructive torque-to-failure batch records.
Precision Fastening & Rail Clamping Lineup
Complete mounting interfaces designed for zero play, thermal expansion relief, and heavy industrial load tolerance.
Engineering Questions & Procurement Knowledge Base
Comprehensive answers regarding anchoring physics, shear mechanics, anti-loosening technologies, and international purchasing procedures.
What sets furniture screw anchors apart from structural masonry anchors?
Furniture screw anchors are engineered primarily for anisotropic substrates like wood, MDF, and thin composite sheet materials, emphasizing high pull-out resistance through wide, knife-edge external threads without bursting brittle boards. In contrast, structural masonry anchors rely on mechanical radial friction expansion or chemical bond adhesion within high-compressive-strength concrete or brick.
How does Youlong prevent hydrogen embrittlement in high-strength carbon steel bolts?
For fasteners graded Class 8.8, 10.9, or higher undergoing electroplating or acid pickling, our factory operates calibrated hydrogen de-embrittlement baking ovens at 200°C–220°C for 4 to 8 hours immediately following surface treatments. This ensures atomic hydrogen trapped in the crystal lattice is completely evacuated, mitigating catastrophic delayed brittle fractures.
Can your engineering team support custom OEM tooling for non-standard anchors?
Yes. Our in-house tooling division develops customized progressive dies, cold heading dies, and specialized thread rolling dies based on buyer 2D/3D CAD models (STEP, DWG, IGES). Prototyping lead times typically range between 10 to 18 days, accompanied by full Initial Sample Inspection Reports (ISIR) and 3.1 chemical test certs.
How is galvanic corrosion avoided when pairing stainless bolts with aluminum extrusions?
Galvanic reactions occur due to the electrochemical potential differential between austenitic stainless steel and aluminum in moist or electrolyte-rich environments. Youlong integrates UV-stabilized EPDM flat washers, nylon isolating sleeves, and specialized fluoropolymer or Dacromet barrier coatings to eliminate metal-to-metal continuity and prevent electrolytic cell formation.
What are the minimum pull-out forces guaranteed on your fish-scale expansion bolts?
Pull-out capacities vary based on embedment depth and concrete class (e.g., C20/25 vs C50/60). For standard M12 fish-scale anchor bolts with an effective anchorage depth of 80mm in non-cracked concrete, characteristic tensile resistance reaches up to 26.5 kN, verified via calibrated hydraulic on-site tensile pull test equipment in our inspection laboratory.
What documentation accompanies export containers dispatched worldwide?
Each commercial consignment includes clean on-board Ocean Bills of Lading, Packing Lists, Commercial Invoices, Certificates of Origin (Form E, CO, or RCEP as applicable), EN 10204 Type 3.1 Inspection Certificates containing heat-number spectrometry chemical assays, mechanical torque-tension results, and salt-spray test logs.