Zhejiang Jiaxing Tuyue Import and Export Company Limited is a long-established Chinese manufacturer and supplier of hardware fasteners including solar mounting fixings, bolts, nuts, and other precision components. The company operates in Jiaxing City — a hub of fastener production and export logistics in the Yangtze River Delta. Its products serve multiple industries from construction to renewable energy, including specialized solutions for solar panel mounting systems.
Among these, solar hanger bolts paired with flange nuts have gained prominence as a reliable connection solution for solar photovoltaic (PV) mounting systems worldwide.
Hanger bolts are double-ended fasteners featuring two threaded sections. One end engages into the structural substrate (like wood rafters or metal roof purlins), and the other end couples with nuts (often hex flange nuts) to hold mounting brackets or rails in place. These are widely used in rooftop PV installations and ground-mount structures.
Distributes load over a larger area.
Reduces the risk of fastener pull-through.
Provides better resistance to loosening from vibration and thermal cycling.
In solar systems, flange nuts are often used with EPDM sealing washers to enhance water tightness where bolts penetrate roofing materials.
A:
Pre-drill holes (especially for wood applications) to align bolt placement.
Insert the hanger bolt with a secure grip into the substrate; wood threads into rafters, and flat head versions can be used for metal purlins.
Add EPDM washers and flange nuts to the outer threaded end before fastening the L-foot or adapter plate for PV rails.
Tighten nuts evenly with recommended torque to ensure firm attachment without crushing sealing elements.
Use proper tools (torque wrench or impact driver with socket) to achieve specified torque values.
Tip: Pre-assembling nuts and washers onto hanger bolts before installation can save labor time and improve consistency.
Problem A: Difficulty driving bolts into metal purlins
Cause: Standard hanger bolts designed for wood don’t thread properly into steel.
Solution:
Use specialized metal hanger bolts with machine threads on both ends or self-tapping features to create threads in thin gauge steel before adding nuts.
Problem B: Leakage or water ingress at roof penetrations
Cause: Inadequate sealing around bolt entry points.
Solution:
Always include EPDM rubber washers beneath flange nuts and around roof profile contours to maintain a water-tight seal, especially on corrugated or trapezoidal metal roofs.
Problem C: Nuts loosening under thermal cycling and vibration
Cause: Expansion and contraction or wind-induced vibration.
Solution:
Choose flange nuts with serrated profiles that provide higher anti-loosening torque compared with standard nuts. Metal finish (e.g., stainless steel) and correct torque settings further help.
Materials:
A2/A4 stainless steel (SS304/SS316) for corrosion resistance in outdoor environments.
Carbon steel with hot-dip galvanization for cost-effective installations with corrosion protection.
Finishes:
Zinc or epoxy coatings enhance longevity in coastal or high-humidity locations.
Stainless finishes naturally resist oxidation without additional plating.
Solar hanger bolts with flange nuts are now standardized across global PV mounting systems, accommodating variations for wood, metal roof profiles, and hybrid structures.
Manufacturers like Tuyue are expanding their solar product ranges as part of broader hardware fastener portfolios — emphasizing quality control from order confirmation through inspection and delivery.
Solar hanger bolts with flange nuts form an essential part of PV installation hardware, offering secure connections, improved sealing, and load distribution. By understanding common pitfalls — such as incorrect fastener type, inadequate sealing, and loosening — installers can optimize solar mounting reliability. Manufacturers like Zhejiang Jiaxing Tuyue Import and Export Company Limited continue to innovate in this segment, supporting global solar deployment with high-performance fastening solutions.
