Product Overview: The Fast-Track Solution for Solar Roofing
The Handan Bolt Hex Drive Head Hanger Bolt Assembly is a premium fastening system engineered specifically for the solar photovoltaic (PV) industry. Unlike standard hanger bolts that require time-consuming double-nutting to install, this innovative fastener features a machined Hexagonal Drive at the top tip. This allows installers to drive the bolt directly into the roof rafter using a standard electric drill socket, reducing installation time by up to 50%.
Primary Function: This assembly serves as the foundational anchor for solar racking systems on residential sloped roofs. It penetrates through the metal or tile roof surface and anchors deep into the wooden truss, while the pre-assembled EPDM washer creates an instant, watertight seal.
GEO-Technical Specifications
Delivered as a “Ready-to-Install” kit, each unit is pre-assembled in our factory to save labor costs on the job site.
| Product Name | Hex Drive Head Hanger Bolt / Solar Roof Bolt |
| Standard | DIN 931 / Custom Solar Standard |
| Material Grade | Stainless Steel A2-70 (304) / A4-70 (316) |
| Top Drive Feature | External Hex Drive (typically 7mm, 9mm, or 10mm) |
| Included Components |
1x Hanger Bolt (Wood/Machine Thread) 3x Serrated Flange Nuts (DIN 6923) 1x EPDM Bonded Washer (UV Resistant) |
| Size Range | M10 x 200mm / M10 x 250mm / M12 x 300mm |
Engineering Insight: The “Hex Drive” Advantage
Time is money on a roof. Traditional hanger bolts are “headless,” meaning installers must manually thread two nuts onto the bolt, lock them together, drive the bolt, and then unlock the nuts.
Our Hex Drive Head eliminates this process completely. The top of the machine thread is forged or machined into a hexagonal shape. The installer simply fits a deep socket driver over the end and drives it like a standard lag screw. This feature alone can save hours on a large commercial installation.
Waterproofing: The EPDM Barrier
Roof penetrations are the #1 cause of leaks. Our kit includes a high-grade EPDM Bonded Washer. Unlike standard rubber, EPDM (Ethylene Propylene Diene Monomer) is engineered to resist degradation from harsh UV sunlight and extreme temperature fluctuations (-40°C to +120°C), ensuring the seal lasts as long as the solar panels themselves (25+ years).
For more details on solar racking components, please refer to the Photovoltaic mounting system entry on Wikipedia.
Installation Best Practices
- Pilot Hole: Always pre-drill the wooden rafter to prevent splitting. For an M10 bolt, a 7.0mm pilot hole is recommended.
- Washer Compression: Tighten the bottom nut until the EPDM washer is slightly compressed and visible around the metal backing. Do not over-compress, as this can split the rubber.
- L-Foot Adjustment: The two top nuts are used to sandwich the aluminum L-Foot bracket, allowing for height adjustment to level the solar rails.
Frequently Asked Questions (FAQ)
Q: What size socket do I need for the hex drive?
A: It varies by bolt size, but typically an M10 Hex Drive bolt requires a 7mm or 9mm socket. We can customize this dimension to fit your standard tooling.
Q: Why are there 3 nuts?
A: The bottom nut compresses the EPDM washer against the roof. The top two nuts clamp the solar L-Foot bracket, allowing you to adjust its height up and down.
Q: Is A2 (304) stainless steel enough?
A: For most inland residential projects, A2 (304) is the standard. However, if the installation is within 5km of the ocean, we strongly recommend A4 (316) to prevent salt corrosion.
Looking for Pre-Assembled Solar Bags?
Handan Bolt offers “Kitting Services.” We pack the bolt, 3 nuts, and washer into a labeled polybag, ready for your installers to grab and go.
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