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.

China Purlin Cross Connectors Supplier & Product

Precision Engineering

Featured Purlin Hardware & Photovoltaic Connectors

Engineered for extreme structural loads, seismic resilience, and rapid installation in commercial solar, agricultural, and industrial canopy structures.

China High-Quality Stainless Steel Self-Drilling Screws

View Drilling Screws

China Heavy-Duty Hot-Dip Galvanized Hex Bolts

View HDG Hex Bolts

High-Strength Double-Hole Pressure Plate

View Pressure Plate

View Structural Hex Bolt

View PV Pressure Plate

View Mounting Plate

Premium Three-Hole PV Mounting Connectors

View Three-Hole Bracket

View Cross Connector Plate

300,000+

Metric Tonnes Shipped

100+

Global EPC Partners

10+

Years Manufacturing R&D

3,000+ hrs

Salt-Spray ASTM B117

Technical Whitepaper

Engineering Integrity of Purlin Cross Connectors in Modern Construction

In utility-scale photovoltaic installations, pre-engineered steel buildings (PEB), and heavy agricultural structures, the purlin cross connector serves as the linchpin of wind uplift restraint and biaxial load transfer.

Mechanical Load Distribution

Cross connectors lock orthogonal secondary members—such as C-Purlins, Z-Purlins, and U-Channels—into rigid structural diaphragms. By distributing negative wind suction and dynamic live snow loads directly into main primary rafters, they suppress lateral-torsional buckling across cold-formed spans.

Precision Progressive Stamping

Manufactured using multi-stage progressive stamping dies, our brackets offer micron-level hole spacing accuracy. This guarantees rapid slot-alignment in the field without on-site reaming, drilling, or thermal gas cutting, significantly slashing installation hours and labor overhead.

Surface Coating & Metallurgy

Available in Hot-Dip Galvanized (HDG ISO 1461), Zinc-Aluminum-Magnesium (Zn-Al-Mg / Magnelis equivalent), and Marine Grade Stainless Steel (SS304/SS316). Self-healing cut edges ensure total resistance against localized pitting and harsh atmospheric micro-climates.

Industrial Ecosystem

China Fastener Capital: Supply Chain Integration

Located in Yongnian District, Handan, Hebei Province, our facilities leverage the world's most concentrated fastener and structural hardware cluster.

Upstream Coil Procurement

Direct access to primary steel and aluminum mills guarantees stable feedstock availability (Q235B, Q355B, AL6005-T5, SUS304) without intermediate markups, protecting global buyers from volatile raw material fluctuations.

In-House Galvanizing & QC

Automated continuous hot-dip plating baths with computerized temperature control guarantee an average zinc coating thickness of >85μm, verified by eddy-current meters and mandatory destructive salt-fog bench testing.

Scalable Freight Logistics

Close proximity to Tianjin Port and Qingdao Port enables rapid multi-modal container consolidation. We manage breakbulk and containerized shipments with pre-fumigated pallets, anti-corrosion VCI wrapping, and moisture desiccants.

Quality & Standards

Localized Engineering Support & Compliance Assurance

Aligning manufacturing tolerances and testing methodologies with international building and safety standards.

Target Region	Applicable Structural & Corrosion Standards	Material Specification	Factory Certification Provided
North America (US & Canada)	ASTM A123, ASTM A153, AISI S100, UL 2703 (Bonding & Grounding)	High-Strength Steel Grade 50, SS304/SS316 Hardware	Mill Test Report (MTR) to EN 10204 3.1
European Union (EU) & UK	EN 1090-2 (Execution of Steel Structures), ISO 1461, Eurocode 3	S250GD + Z275 / S350GD + ZM310 (Zinc-Magnesium)	CE Conformity / Factory Production Control (FPC)
Australia & New Zealand	AS/NZS 4600 (Cold-formed Steel), AS/NZS 1170.2 (Wind Action)	G450 / G550 Galvanized Sheet, SS316 High-Chloride Grade	NATA Traceable Batch Inspection Certificates
Middle East & North Africa (MENA)	ISO 9223 Category C4/C5 High-Salinity Desert Exposure	Zn-Al-Mg 430g/m² or Heavy Hot-Dip Galvanized ≥85μm	Third-Party Salt Spray Test (SGS / TÜV Rheinland)

Deployments

Localized Application Scenarios

Engineered for extreme environmental conditions, from high-wind offshore coastal areas to arid utility solar fields.

Utility-Scale Solar Racking

Forms high-shear cross joints linking longitudinal module support rails to crossbeams on fixed-tilt and single-axis solar tracker systems. Engineered to absorb cyclical thermal expansion and wind micro-vibrations over 25+ year project lifespans.

Pre-Engineered Metal Buildings (PEB)

Used in commercial warehouses and distribution logistics centers to brace wall girts and roof purlins. Facilitates continuous lap joint configurations that eliminate cold bridges and prevent structural deflection under uneven snow drifts.

Greenhouse & Agri-PV Canopies

High-humidity, chemical-fertilizer-rich agricultural atmospheres require resilient coatings. Our Zinc-Aluminum-Magnesium connectors prevent rust along sheared bolt perimeters, maintaining total framing stability over high-clearance canopy spans.

Market Evolution

Global Industry & Structural Hardware Trends

Key metallurgical and mechanical trends transforming purlin fastening and mounting hardware specifications worldwide.

Transition to Zn-Al-Mg (Zinc-Aluminum-Magnesium)

Heavy traditional batch hot-dip galvanizing is increasingly being augmented by pre-coated Zn-Al-Mg steel coils. Offering up to 5 to 10 times higher corrosion resistance than standard galvanizing in marine and ammoniacal environments, Zn-Al-Mg provides superior sacrificial edge healing, reducing environmental zinc runoff.

Tool-Free Pre-Assembled Fastening Units

Labor shortages in Europe, Australia, and the Americas have intensified the demand for pre-fitted cross connectors. By incorporating quick-slot lock bolts and captive serrated flange nuts directly onto connector plates, field installers reduce bolting steps by over 40%, delivering massive cost savings during EPC construction.

Procurement Intelligence

Frequently Asked Questions (FAQ)

Detailed answers regarding technical specifications, custom fabrication capabilities, corrosion testing, and international shipping.

What materials and grades are available for your purlin cross connectors?

We manufacture purlin cross connectors in a wide variety of certified materials to suit specific structural and atmospheric demands: Q235B and Q355B structural carbon steel (equivalent to ASTM A36 / Grade 50 and EN S235 / S355), pre-galvanized cold-rolled coil, Zinc-Aluminum-Magnesium (Zn-Al-Mg), extruded architectural aluminum AL6005-T5 / AL6063-T6, and austenitic stainless steels SS304 (A2-70) and SS316 (A4-80) for high-salinity coastal environments.

How do you guarantee corrosion performance for outdoor photovoltaic installations?

Every production batch undergoes rigorous quality control. For Hot-Dip Galvanized components, we conform to ISO 1461 / ASTM A123 standards, maintaining uniform zinc coatings exceeding 85μm thickness (equivalent to 610 g/m²). In our in-house test laboratory, components undergo neutral salt spray testing (ASTM B117) exceeding 1,000 to 3,000 continuous hours without red rust failure. Batch test certificates and third-party inspection reports (SGS, BV, TÜV) are provided with shipping documentation.

Can you produce custom purlin cross connectors from OEM technical drawings?

Yes. Over 60% of our production volume consists of custom-engineered OEM orders. We operate in-house CNC machining centers, wire-EDM die cutting, multi-ton hydraulic presses, and automated progressive stamping tooling. Clients simply share 2D CAD (DWG, DXF, PDF) or 3D STEP models. Our engineering department reviews hole tolerances, bend radiuses, and structural load points, issuing DFM (Design for Manufacturability) proposals and prototype samples within 5 to 7 working days.

How do you mitigate galvanic corrosion when clamping steel connectors to aluminum PV rails?

Direct interfacial contact between dissimilar metals (e.g., carbon steel or bare stainless steel in contact with aluminum) induces accelerated galvanic corrosion in the presence of an electrolyte like rainwater. To eliminate this issue, we provide customized insulating barrier pads (UV-stabilized EPDM or high-density nylon gaskets) as well as Dacromet / Geomet coated structural bolts and delta-protekt coated hardware that maintain electrical neutrality across the load-bearing interface.

What are your export lead times, MOQ, and standard packaging configurations?

Standard catalog components maintain an MOQ of 1,000 units, while customized stampings require an initial batch run of 5,000 to 10,000 pieces depending on part dimensions. Standard production lead times run between 15 and 25 calendar days for a 20ft/40ft full container load (FCL). Fasteners and brackets are packed in heavy-duty 25kg reinforced corrugated cartons, cross-banded onto heat-treated ISPM 15 compliant wooden pallets, and securely wrapped in waterproof stretch film with VCI rust-inhibiting liners.

Direct Catalog Supply