The Fastensol Rail Splice is a precision-engineered internal connector used to join two lengths of Fastensol mounting rail into a single, structurally continuous run. It slides inside the channel of both rail ends, aligning them flush so that a solar PV array can span longer roof runs than a single 3550mm rail length allows, without any loss of mechanical strength at the joint.
Manufactured from Aluminium 6005-T5 and SUS304 stainless steel fixings, the splice is corrosion-resistant and compatible with both silver and black anodised Fastensol rail profiles. Rated to the same wind load of 88m/s and snow load of 2.0kN/m² as the rest of the Fastensol pitched roof system, it is essential hardware for any array where a single row of panels exceeds one rail length.
2.0 kN/m²
Snow Load Rated
Do Not Mix With Other Suppliers' Hardware
Fastensol mounting equipment must not be used with mounting equipment from other suppliers. Mixing rails, clamps, hooks or splices between different manufacturers can compromise structural integrity, will invalidate the 12-year product warranty, and may breach the conditions of MCS certification for the completed installation.
Key Features
Internal Slide-In Design
The splice inserts inside the rail channel on both sides of the joint, keeping the external rail profile completely flush and uninterrupted for a clean, professional finish with no visible step at the join.
High-Strength Aluminium Construction
Built from Aluminium 6005-T5 — the same structural-grade alloy used throughout the Fastensol rail system — the splice transfers load evenly across the joint so the spliced run performs as a single continuous rail.
Corrosion-Resistant Fixings
Secured using SUS304 stainless steel bolts, tightened with an Allen key, giving long-term resistance to weathering in exposed rooftop conditions.
Universal Rail Compatibility
Compatible with all standard Fastensol rail profiles, including both silver and black anodised finishes, so the splice can be matched to any Fastensol pitched-roof installation.
Essential for Long Rows
For rows of panels that exceed a single 3550mm rail length, the rail splice allows installers to join multiple rail sections into one continuous run rather than starting a new, separately-supported rail.
Simple Two-Bolt Installation
Slide the splice halfway into the rear channel of the first rail and tighten the first M8 bolt with an Allen key, then slide the next rail section into the exposed half of the splice and tighten the second bolt — the joint is complete with no special tools required.
Technical Specifications
Identification
Product Type
Rail Splice / Rail Joiner Connector
Manufacturer
Xiamen Fasten Solar Technology Co., Ltd (Fastensol)
Compatible Systems
Fastensol pitched roof mounting rail (silver and black)
Material & Construction
Rail Splice Material
Aluminium 6005-T5
Fixing Bolts
SUS304 stainless steel, M8
Finish
Anodised, matched to silver or black rail
Drive
Hexagon socket (Allen key)
System Ratings
Maximum Building Height
20 m
Applicable Module Orientation
Landscape or portrait
Standards
AS/NZS 1170, MCS, JIS & SGS
Packaging & Warranty
Package Detail
30 pcs per carton
Product Warranty
12 years material · 5 years finish
Frequently Asked Questions
When do I need a rail splice?
You need a rail splice whenever a single row of solar panels is longer than one 3550mm rail length. Rather than starting a new, independently supported rail run, the splice lets you join two rail sections into one continuous, structurally sound length that spans the full row.
Is the rail splice compatible with both silver and black rails?
Yes. The Fastensol Rail Splice is compatible with all standard Fastensol rail profiles, including both the silver and black anodised finishes, so it can be used on any Fastensol pitched-roof installation regardless of rail colour.
How is the rail splice installed?
The splice slides into the rear channel of the pre-assembled rail and is secured with the first M8 bolt using an Allen key. The next rail section is then slid onto the exposed half of the splice and the second bolt tightened, completing a flush, continuous joint with no visible step.
Does adding a splice affect the wind or snow load rating of the system?
No. The rail splice is rated to the same wind load (88 m/s) and snow load (2.0 kN/m²) as the rest of the Fastensol pitched roof system, so a correctly installed spliced rail performs as a single continuous structural member.
Can I use this with mounting rails or clamps from another brand?
No. Fastensol components are engineered as a matched system, and mixing Fastensol hardware with mounting equipment from other suppliers is not supported and will void the warranty. Always use genuine Fastensol rails, clamps, hooks and splices together as a complete system.
What warranty does this product carry?
Fastensol backs this product with a 12-year product warranty against defects in material and workmanship, plus a 5-year finish warranty on the anodised coating, from Xiamen Fasten Solar Technology Co., Ltd. The finish warranty is void if the component is not cleaned and maintained in line with AAMA 609 & 610-02 guidance for architecturally finished aluminium, and the full warranty is void if the product is modified, installed incorrectly, or mixed with another manufacturer's mounting hardware.
