Stainless steel double-thread fasteners for fixing PV mounting systems to timber rafters and suitable steel purlins on penetrative pitched roofs.
Solar Hanger Bolts for Rooftop PV Mounting
Available in M8, M10 and M12 configurations with different lengths, thread combinations, sealing washers and mounting interfaces. OEM dimensions and pre-assembled kits are available for different PV mounting systems.
Application
Corrugated and Trapezoidal Metal Roofs, Wooden Rafters, Steel Purlins
Material
SUS304 / SUS316 / EPDM washer
Customization
OEM / ODM available
Solar Hanger Bolt at a Glance
| Item | Typical Options |
| Application | Rooftop PV mounting |
| Structural substrate | Timber / selected steel structures |
| Material | SUS304 / SUS316 / Carbon Steel |
| Thread | Wood thread / metric thread |
| Sealing | EPDM washer |
| Connection | L-foot / adapter plate |
| Customization | OEM / ODM |
| Diameter | M8 / M10 / M12 |
| Typical length | 160 / 180 / 200 / 250 / 300 mm |
| Customization | Available |
| OEM packaging | Available |
Technical Note: Final product configuration should be confirmed according to the module, rail profile, fastening system, and project requirements.
Product Dimensions
The technical drawing defines the key dimensions and interfaces required for product selection, installation, and system integration.
Technical Resources
OEM / ODM Customization
Standard mounting components do not always fit every PV module, rail system, or installation requirement. We can develop or supply customized mounting components according to your module, rail, dimensional, material, and branding requirements.
Material & Finish
Material, surface treatment, protective components, and other specified requirements.
Branding & Packaging
Logo, product labeling, private-label packaging, customized identification.
Geometry &Fastening
Clamp dimensions, geometry, Bolt, T-bolt, nut, and fastening configuration
Production & Quality
We focus on dimensional consistency, interface compatibility, and repeatable production for PV mounting components.
Material Verification
Specified materials and components are checked against the confirmed product requirements.
Dimensional Inspection
Dimensions and interfaces are inspected according to the approved specification.
Surface Inspection
Surface finish and visible product condition are checked before shipment.
Component Inspection
Fasteners, inserts, and other supplied components are checked according to the confirmed configuration.
Packaging Inspection
Product quantity, identification, and packaging are checked before shipment.
Applications
Corrugated Metal Roof, Trapezoidal Sheet Metal Roof, Insulated / Built-up Roof, Fibre-Cement Roof
Complete the Mounting Connection
Middle Clamp
For securing adjacent PV modules along the mounting rail.
Mounting Rail
Structural rail for supporting and positioning PV modules.
Rail Connector
For connecting aluminum mounting rail sections.
L Foot
For connecting the mounting rail to the supporting structure.
Frequently Asked Questions
What is a solar hanger bolt?
A solar hanger bolt is a double-thread fastener used to connect a rooftop PV mounting structure to an underlying structural member. One end is designed for engagement with the supporting structure, such as a timber rafter, while the exposed metric thread can connect to an L-foot, adapter plate, rail or other PV mounting component.
What is a solar hanger bolt used for?
Solar hanger bolts are commonly used in penetrative rooftop PV mounting systems where the mounting structure needs to be mechanically connected through the roof covering to the supporting structure below. Typical applications include corrugated metal roofs, trapezoidal sheet metal roofs and selected pitched-roof constructions with suitable timber or steel substructures.
How does a solar hanger bolt work?
A typical installation transfers the mounting connection through several components: PV module → mounting rail → L-foot / adapter plate → metric thread → hanger bolt → structural member
Can solar hanger bolts be used on timber roofs?
Yes. Hanger bolts with an appropriate wood-thread configuration are commonly used for timber rafters and other suitable timber structural members. The required thread engagement depends on factors such as the timber properties, structural design, fixing position and applicable project requirements. The bolt should be installed into the intended structural member rather than relying on the roof sheet alone.
Are solar hanger bolts waterproof?
The hanger bolt itself is not a waterproofing system. Waterproofing depends on the complete roof penetration assembly, including the EPDM washer, roof profile, penetration position, washer compression and any additional sealing components required for the specific roof. Correct installation is therefore as important as the choice of sealing material.
What is the purpose of the EPDM washer on a solar hanger bolt?
The EPDM washer is used to help seal the area around the roof penetration. It should sit correctly against the roof surface and be compressed sufficiently to provide the intended seal without excessive deformation. The washer size, material and sealing arrangement should be compatible with the roof profile and hanger bolt assembly.
Can EPDM washers be used on all types of roofs?
Not necessarily. The correct sealing arrangement depends on the roof profile, roof material, hanger bolt geometry and installation method. Corrugated and trapezoidal metal roofs may require different washer or saddle arrangements depending on the profile. For unusual roof constructions, the complete penetration detail should be reviewed before installation.
Can solar hanger bolts be used on steel purlins?
Yes, but the hanger bolt must be specifically suitable for the steel purlin application. The fastener configuration should be selected according to the steel thickness, thread design, installation method and required engagement. A hanger bolt designed for timber should not automatically be substituted for a steel-compatible configuration.
What size solar hanger bolt do I need?
The correct size depends on the complete mounting assembly rather than the roof covering alone. Important factors include: Structural substrate Required structural engagement Roof build-up Mounting component dimensions Design loads Required exposed thread Installation method M8, M10 and M12 are common diameter options for PV mounting applications, but the final specification should be confirmed against the mounting system design.
What length of solar hanger bolt should I use?
The required length should account for the roof build-up, sealing components, structural engagement and the connection components above the roof. A longer bolt is not automatically better. Insufficient length can reduce structural engagement or prevent proper connection, while excessive length can create unnecessary exposed thread and interfere with the mounting assembly. For OEM projects, we recommend confirming the required dimensions from the roof construction and mounting-system drawing before production.
What is the difference between a solar hanger bolt and a solar mounting screw?
A solar hanger bolt normally provides two connection interfaces: a structural fixing thread and an exposed metric thread for connecting PV mounting components. A solar mounting screw may instead be designed as a single fastener for directly fixing a component to a particular roof or structural material. The two products should not be treated as interchangeable without checking the roof structure and mounting-system requirements.
How should a solar hanger bolt be installed?
A typical installation involves: Locating the supporting rafter or purlin Marking the fixing position Preparing the required hole according to the fastener and substrate Installing the hanger bolt Positioning the EPDM sealing washer Installing the L-foot or adapter plate Connecting the mounting rail Checking alignment, thread engagement and sealing The exact installation procedure should follow the approved product and mounting-system instructions.
Need a Standard or Custom Hanger Bolt?
Send us your module details, rail profile, drawing, existing component, or specification.