The Fastensol Rubber Rail End Cap is a simple push-fit finishing accessory that closes off the open ends of Fastensol mounting rail. Made from UV-stabilised rubber, it protects the rail channel from dust, water, insects, and mechanical damage while giving the finished installation a clean, professional appearance.
By covering the rail's sharp cut or extruded edge, the end cap also improves installer and maintenance safety, reducing the risk of snagged clothing, tools, or cabling during and after installation. It is available in silver and black variants to match either Fastensol rail finish.
UV-Stable
Rubber Material
Push-Fit
Tool-Free Install
F-MR-S / F-MR-B
Compatible Rails
Weatherproof
Ingress Protection
Key Features
Weatherproof Rail Protection
Made from UV-stabilised rubber, the end cap seals the open rail channel against dust, moisture, insects, and general weather exposure, protecting the rail interior over the long term.
Tool-Free Push-Fit Installation
The cap pushes securely into the rail end with no tools, fixings, or adhesive required — a quick final step at the end of the rail installation process.
Improved Installer Safety
By covering the sharp cut or extruded rail edge, the cap reduces the risk of cuts, snagged clothing, or damaged cabling during installation, commissioning, and future maintenance.
Available in Silver or Black
Offered in both silver and black to match either the mill-finish or black anodised Fastensol rail, giving a colour-matched, professional finish at both ends of every rail run.
Compatible with Fastensol Rail Types F-MR-S / F-MR-B
Designed specifically to fit the Fastensol F-MR-S (silver) and F-MR-B (black) rail profiles, ensuring a snug, secure fit rather than a generic universal cap.
Neat, Finished Aesthetic
Closing off exposed rail ends with a colour-matched cap gives the completed array a tidy, professional appearance, particularly on visible rail ends at the edges of a roof.
Technical Specifications
Identification
Product Type
Rubber Rail End Cap
Manufacturer
Xiamen Fasten Solar Technology Co., Ltd (Fastensol)
Compatible Rail Types
F-MR-S (silver rail) / F-MR-B (black rail)
Material & Construction
Material
UV-stabilised rubber
Installation Method
Push-fit, tool-free
Variants Available
Silver Rail End Cap
For use with silver anodised Fastensol rail (F-MR-S)
Black Rail End Cap
For use with black anodised Fastensol rail (F-MR-B)
Warranty
System Warranty
12 years material · 5 years finish (as part of the Fastensol mounting system)
Available Variants
Variant
Colour
Compatible Rail
Finish Match
Silver End Cap
Silver / Grey
Fastensol F-MR-S (Silver Rail)
Mill / silver anodised
Black End Cap
Black
Fastensol F-MR-B (Black Rail)
Black anodised
Frequently Asked Questions
Do I need an end cap on every rail?
End caps are recommended on any exposed, open rail end — typically the outer ends of each rail run at the edges of the array. They are not required at rail-to-splice joints, since the rail splice covers the internal channel at that point.
How do I know whether to order the silver or black end cap?
Match the end cap colour to your rail finish: choose the silver variant for Fastensol's silver anodised rail (F-MR-S), or the black variant for the black anodised rail (F-MR-B), so the cap blends in seamlessly with the rest of the installation.
Is any tool needed to fit the end cap?
No. The end cap is a simple push-fit component — it presses directly into the open end of the rail channel by hand, with no fixings, adhesive, or tools required.
What does the end cap protect against?
The UV-stabilised rubber end cap protects the open rail channel from dust, water ingress, insects, and general weather exposure, while also covering the sharp rail edge to reduce the risk of cuts or snagging during installation and maintenance.
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.
