What products does Youlong manufacture?

Youlong manufactures photovoltaic mounting components such as aluminum guide rails, water channels, angle brackets and connectors, plus precision fasteners including anchor bolts, carriage bolts, expansion bolts, flat washers and wing nuts for solar, wind power and construction projects.

Can you produce custom PV brackets and fasteners to my drawings?

Yes. Our automated stamping, forging and CNC machining lines support OEM and custom production. Send drawings or samples with material, finish and quantity requirements, and our engineers will confirm feasibility, tolerances and a written proposal.

How do you control the quality of fasteners for outdoor solar projects?

We run random inspections from raw material intake to final dispatch and test against industry standards, including salt spray corrosion testing and tensile strength testing, so that hardware performs reliably in long-term outdoor exposure.

Which material should I choose for coastal or high-humidity PV sites?

For coastal, offshore or industrial sites with high corrosion categories, stainless steel grade 316 (A4) fasteners are generally recommended. For inland sites, 304 (A2) stainless or hot-dip galvanized carbon steel is commonly specified. Isolating washers help prevent galvanic corrosion between aluminum rails and steel hardware.

Where is Youlong located and do you export worldwide?

Youlong is located in Yongnian District, Handan City, Hebei Province, known as China's Fastener Capital. We have served more than 100 clients worldwide with cumulative shipments exceeding 300,000 tonnes.

Industrial Fastening Whitepaper & Engineering Catalog

China Self Anchoring Bolts Product & Products

Next-generation mechanical undercut anchorage, fish scale stability expansion systems, and precision structural hardware engineered for utility-grade photovoltaic arrays, critical infrastructure, and seismic-resistant masonry fixings.

Primary Engineering Solutions

High-Integrity Self Anchoring Bolts & Connectors

Engineered cold-formed carbon steel and high-tensile stainless steel anchors manufactured direct from China's industrial fastener capital.

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300,000+

Metric Tonnes Shipped Globally

100+

International EPC & Distribution Clients

10+

Years Dedicated Hardware Metallurgy R&D

50+

In-House QA Engineers & Machinists

Industrial Significance

The Global Commercial & Engineering Paradigm of Self Anchoring Fasteners

In structural engineering, the distinction between standard mechanical expansion bolts and self-anchoring undercut systems defines catastrophic boundary lines between anchor displacement and structural stability.

Elimination of Outward Radial Stress

Traditional friction sleeve anchors exert permanent radial outward pressure against the borehole walls. In cracked concrete (Condition B) or thin-slab foundations common in commercial rooftop solar installations, this expansion creates high burst stress. Self-anchoring undercut bolts form an interlock that does not rely exclusively on side-friction, preventing premature edge breakout.

Zero burst stress around foundation edges
Qualified for seismic Category C1/C2 applications

Dynamic Dynamic & Fatigue Resistance

Utility photovoltaic trackers and coastal substations experience sustained harmonic vibration and fluctuating cyclic wind uplift. The engineered fish-scale friction profiles and precision undercuts distribute tensile load along the mechanical keyway, safeguarding installations against creep deformation and anchor slip under 30-year fatigue cycles.

Anti-loosening geometrical mechanical lock
Resists sustained high-cycle resonant frequencies

Comprehensive Load Path Continuity

A PV mounting assembly is only as dependable as its anchor point into the substrate. By unifying the structural chain—from base concrete self-anchoring hardware through reinforced aluminum rails (PV 3040) up to module clamping plates—our manufacturing eliminates interface incompatibilities and galvanic micro-corrosion.

Rigorous electrochemical pairing protocols
Tested across tens of thousands of continuous shear tests

In-Field Deployments

Localized Engineering Use Cases & Substrate Environments

Across diversified geological topographies and extreme environmental sectors, self-anchoring bolts resolve unique physical assembly constraints.

Desert Solar Plants (Thermal Shock)

Installed across arid regions in the Middle East and Western China, concrete footings experience extreme diurnal thermal swings (-5°C to 55°C). Self-anchoring mechanical sleeves compensate for micro-expansion discrepancies between substrate and steel, retaining tight pre-torque values where chemical epoxies degrade or liquefy.

Thermal Stability: -40°C to +120°C

Coastal Marine & Offshore Substations

Operating in aggressive ISO 12944 C5-M marine atmospheres, our marine-grade A4-80 (SS316) self-anchoring hardware and specialized hot-dip galvanized units (layer thickness ≥86μm) deliver verifiable salt spray corrosion resistance exceeding 1,000 to 2,000 hours without red rust development.

Passes ASTM B117 & ISO 9227

Urban Retrofit & Masonry Facades

When anchoring bracket hardware into older masonry, hollow block, or unreinforced concrete walls, standard expansion plugs shatter surrounding brickwork. The fish-scale expansion mechanism activates localized load transfer zones, preventing wall fracture and securing structural perimeter envelopes.

High Shear Capacity: Hollow/Solid Substrates

Supply Chain Resilience

Handan Yongnian Manufacturing Cluster: Unrivaled Scale & Efficiency

Located in the heart of China’s premier fastener epicenter, Handan Youlong Fastener leverages vertical manufacturing ecosystems to insulate global EPC clients from supply chain disruptions.

Supply Chain Dimension	Conventional Sourcing Broker	Youlong Integrated Cluster Direct Factory	Procurement Advantage
Raw Material Sourcing	Multiple tier re-sellers; erratic metallurgical heat tracing	Direct pipeline with premier steel mills; 100% mill test certificates (MTR)	Consistent raw yield strength and certified carbon/alloy chemistry
Cold Forging & Stamping	Outsourced job shops; uncoordinated lead times	Continuous in-house automated cold heading, precision CNC & blanking	Tolerances controlled within ISO 898-1 strict DIN/ASME envelopes
Surface Metallurgy	Remote finishing plants prone to regional environmental halts	Closed-loop, environmentally compliant hot-dip galvanizing & sherardizing lines	Coating uniformity, defect-free root threads, salt spray resilience
Logistics Velocity	Fragmented transport; multiple cross-dock handling delays	Integrated bulk shipping conduits to Tianjin Port and major rail freight arteries	Container loading lead times compressed by 35% on high-volume runs

Future-Proof Engineering

Technical Roadmap: Smart Anchorage & Advanced Metallurgy

The transition toward mega-watt renewable energy structures demands higher load capabilities and automated status verification.

Nanoscale Zinc-Flake & Geomet Coatings

Moving beyond standard electro-plating, our R&D roadmap introduces micro-thin non-electrolytically applied zinc-flake matrices. This coating provides cathodic protection without risk of hydrogen embrittlement in Grade 8.8 and 10.9 high-tensile anchor rods.

Self-Sensing Torque Verification

Collaborating with university materials laboratories, Youlong is pioneering optical torque-indicator anchor collars. In-field technicians can inspect and verify complete expansion locking with visual indicator changes, drastically cutting EPC commissioning labor costs.

Austenitic-Ferritic Duplex Steels

For chemical and extreme offshore solar deployments, select product lines are adopting 2205 Duplex stainless steel. This alloy yields double the mechanical strength of 316 stainless while delivering exceptional pitting resistance equivalent numbers (PREN ≥ 35).

International Compliance

Engineering Support, On-Site Testing & Regulatory Assurance

Procuring structural anchor hardware from China is supported by transparent documentation, traceable metallurgical verification, and responsive engineering assistance.

EN 10204 3.1 Traceability

Every commercial production run is accompanied by a certified Inspection Certificate 3.1 detailing chemical heat analysis, yield point, ultimate tensile strength, elongation, and charpy impact resistance values according to European and American codes.

Rapid Drawing-to-Tooling OEM

Have custom embedment depths or regional code constraints? Our CAD/CAM tooling facility fabricates custom dies and produces functional prototypes within 7 to 10 working days, backed by in-house hydrostatic pull-out tensile testing verification.

Project-Phased Delivery Logistics

We work with international forwarders to offer bonded warehousing, custom palletization with moisture-proof wrapping, and barcoded project-phase staging, ensuring site installers receive hardware aligned with construction schedules.

Procurement Knowledge Base

Frequently Asked Questions: Technical & Sourcing Inquiries

Technical clarity for structural designers, quality assurance directors, and import managers specifying self-anchoring hardware.

What is the structural difference between self-anchoring bolts and regular wedge anchors?

Wedge anchors depend entirely on continuous radial friction against the concrete hole walls, which can slip if the concrete develops seismic micro-cracks. Self-anchoring bolts utilize an undercut or specialized fish-scale mechanical collar that forms a positive mechanical interlock into the concrete matrix, securing high loads with minimal continuous radial burst pressure.

How do fish-scale expansion bolts optimize grip inside hollow or low-density masonry?

The fish-scale patterned surface provides progressive stepped points of contact. When tightened, each scale-like rib engages against the irregularities of the brick or low-density concrete substrate, distributing shear and tensile forces over an elongated area rather than concentrating strain at a single fracture point.

How does Youlong prevent galvanic corrosion between steel anchors and aluminum PV rails?

In addition to manufacturing rails and bolts from compatible alloys (such as SS304/SS316 with specific passivation treatments), we provide specialized isolating EPDM washers and high-dielectric nylon bushings. These barriers physically prevent electronic transfer between dissimilar metals in wet outdoor environments.

What testing data is provided to verify anchor pull-out loads before shipment?

Our quality assurance laboratory conducts random lot testing on calibrated universal tensile testing machines. Clients receive comprehensive test certificates indicating proof load, yield capacity, tensile rupture load, and salt spray test hours in compliance with ASTM E488 and ISO 898 standards.

Comprehensive System Fasteners

Structural Racking Rails, Anchors & Mounting Hardware

Extend your project durability with precision aluminum extruded rails, clamping systems, and specialized foundation fixings.

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