RailFX RFX100 Round Top Rail (Post to Post)

The RFX100 delivers the only graspable 2-inch round profile in the RailFX lineup, making it the go-to choice for stair applications where code requires a graspable handrail. This post-to-post system installs between posts for a traditional appearance while maintaining compatibility with cable, picket, or glass infill options.

The concealed hardware system uses Professional 224 Series cable hardware that hides within pre-drilled posts, eliminating the visual clutter of exposed tensioning hardware. The aluminum construction won’t rust, rot, or warp, and requires virtually no maintenance — no painting or staining needed. For Montana’s freeze-thaw cycles and variable climate, that durability matters.

Technical Specifications and Material Quality

The RFX100 uses high-grade 6063-T6 aluminum extrusions — the same alloy grade used in architectural applications where strength and corrosion resistance matter. The finish meets AAMA 2605 standards, which represents the highest performance level for organic coatings on aluminum. That translates to color stability and chalking resistance that lesser finishes can’t match.

Specification	Value	Source
Top Rail Profile	Round	Ground Truth
Top Rail Diameter	2 inches (graspable size)	Manufacturer
Material	6063-T6 aluminum	Manufacturer
Base Plate Thickness	3/8 inch pre-attached	Manufacturer
Cable Diameter	1/8 inch	Manufacturer
Max Post Spacing (Cable)	5 feet (60 inches)	Manufacturer
Max Post Spacing (Picket)	6 feet	Manufacturer
Finish Standard	AAMA 2605 compliant wet-coat	Manufacturer
Configuration	Post to Post	Ground Truth

Stock colors include black, white, bronze, and silver, with custom colors available for projects that need specific matching. The custom color option matters for high-end residential work where matching existing finishes drives material selection.

Installation Process and Hidden Hardware System

The pre-drilled posts eliminate on-site drilling for cable pass-through, which speeds installation and ensures consistent hole alignment. Thread the 1/8-inch cables through the pre-drilled intermediate posts, then tension from the center outward using the hidden pull-lock fittings. This center-out tensioning method prevents the cumulative tension issues that plague systems tensioned from one end.

The installation sequence follows proven methods:

Plan post layout with maximum 5-foot spacing for cable infill. Install corner and end posts using surface, fascia, or core mount options. Align intermediate posts using a string line or laser level. Cut the top rail to length and attach to posts using Rail-to-Post Brackets (RCBs).

Required tools include an impact drill, cut-off wheel, angle finder, Allen hex wrench, and silicone adhesive. The top rail cuts easily on-site to fit specific project lengths — no need for factory-specific lengths or complicated splicing systems.

The final step snaps top-rail filler trim into the bottom of the RFX100 rail for a finished appearance. This trim piece hides the rail-to-post connection hardware and creates a clean underside view.

Stair Applications and Code Compliance

The round graspable profile qualifies this system specifically for stair applications where building codes require handrails people can actually grip. The 2-inch diameter hits the sweet spot — large enough for a comfortable grip, small enough to meet most residential code requirements for graspability.

The system meets both IBC (International Building Code) and IRC (International Residential Code) requirements. The marine-grade 316 stainless steel cable option meets ASTM standards for strength, critical for both safety compliance and longevity in Montana’s climate.

While limited direct retail reviews exist since this is primarily a professional-grade B2B product, users appreciate the ease of tensioning with the hidden pull-lock system and the high-end appearance of the round profile on stairs.

Comparison Within the RailFX Line

The RFX100’s post-to-post configuration creates distinct defined sections with a traditional look, unlike over-the-post systems that run continuously. Alternative profiles in the RailFX line include the RFX200 Square Top for contemporary level runs, RFX250 Flat Top for modern minimalist aesthetics, RFX300 Elliptical Top for unique designer looks, and RFX400 Wood Top Adapter for integration with existing wood structures.

The round profile sets the RFX100 apart as the stair specialist in the lineup. While other profiles work for level runs, only the round top meets graspability requirements for angled installations.

FAQ

What infill options work with the RFX100 system?

The system accommodates 1/8-inch stainless steel cable, 5/8-inch x 5/8-inch aluminum pickets, or 1/4-inch tempered glass panels. Cable remains the most popular choice for maintaining views while meeting code requirements.

How does the warranty coverage break down?

Aluminum components (posts and rails) carry a Limited Lifetime Warranty. Stainless steel hardware (cables and fittings) includes a 10-Year Limited Warranty. Paint finish warranty varies by environment.

What mounting options does the system support?

The RFX100 works with surface mount, direct-to-fascia, fascia bracket, and concrete core mount installations. This flexibility allows adaptation to various deck constructions and retrofit situations.

Can the system handle Montana’s freeze-thaw cycles?

The aluminum construction won’t rust, rot, or warp. Combined with marine-grade stainless steel cable options and high-performance AAMA 2605 coating, the system handles temperature swings and moisture exposure without degradation.

What comes in the standard kit?

Standard kit components include the RFX100 Round Top Rail extrusion, top rail filler trim, Rail-to-Post Brackets (RCBs), and mounting screws and fasteners. Optional accessories include post stiffeners, post caps, BR100 bottom rail, cable tensioning tool kit, and Boeshield T-9 protectant.