The same Galvanised Steel Fence Bracket Kit fits both post types on an RWD retaining wall. RWD's steel posts come in two cross-sections, an H-beam profile (100UC) typically used for middle posts, and a C-channel profile (100PFC) typically used for end posts, and the fence bracket kit is made to suit both. You don't need a different bracket for each.
This article is narrowly about the fence bracket. If you're choosing which post profile to build your wall with in the first place, that's a separate decision covered in RWD's H-Beam vs C-Channel Steel Posts guide.
Why There Are Two Post Profiles in the First Place
A retaining wall built with steel posts needs a post at every joint, and the posts do different jobs depending on where they sit in the run.
- Middle posts carry sleeper load from both sides, so an H-shaped (universal column, UC) profile is used. The two flanges give it a sleeper channel on each side.
- End posts and corners only need a channel on one side, so a C-shaped (parallel flange channel, PFC) profile does the job with less steel.
RWD's Sizing & Fitting Guide describes the fence bracket kit as suiting both. That compatibility line is the whole basis for this topic, and it's worth being upfront about that, because it means this article confirms one fact rather than covering new ground.
What "Fits Both" Actually Means for You
In practical terms, it means you buy the fence bracket kit by fence load and fence type, not by which post profile happens to be at that spot in the wall. A run with alternating H-beam middle posts and C-channel end posts uses the same bracket kit throughout. You're not trying to match a bracket shape to a post shape.
| Post profile | Where it's used | Bracket needed |
|---|---|---|
| 100UC (H-beam) | Middle posts | Galvanised Steel Fence Bracket Kit |
| 100PFC (C-channel) | End posts, corners | Galvanised Steel Fence Bracket Kit |
If You're Not Sure Which Post You Have
Look at the cross-section from above. An H-beam has a flange on both sides of a central web, so sleepers sit in a channel on either side. A C-channel has flanges on one side only, forming a single open channel. If your wall was built by RWD or to RWD's post range, middle posts are H-beam and end and corner posts are C-channel, 45° posts and joiner posts are their own separate profiles again.
Where H-Beam vs C-Channel Does Matter
This article's angle, per RWD's own keyword research, doesn't have dedicated search demand of its own, mostly because for the fence bracket it's a non-issue. But the post profile does matter elsewhere in a build, and it's worth knowing where:
- Post caps. RWD's Galvanised Steel Post Caps are profile-specific: an H Post Cap for H-beam posts and a C Post Cap for C-channel posts, plus separate 45°, LH and RH variants. Caps are the one part of the system where you do need to match the profile.
- Sleeper fit. The sleeper channel width and depth differ slightly between the two profiles, which is a structural consideration for the wall build itself, not for the fence bracket.
- 150mm vs larger sections. If you're comparing post sizes beyond the standard 100 series, the differences between sizes become more significant for wall height and load, which is a separate question from H-beam vs C-channel shape at the same nominal size.
This is confirmed: it's the same bracket, the same bolt pattern, and the same install method on both profiles. The one difference is where the plate seats. On an H-beam (100UC) post, the plate lands against the flange face. On a C-channel (100PFC) post, it lands against the outer face of the web. That's a difference in which surface the plate sits flush against, not a difference in hardware or fitting method.
FAQs
Do I Need a Different Bracket for H-Beam and C-Channel Posts?
No. RWD's Galvanised Steel Fence Bracket Kit is made to suit both 100UC and 100PFC posts.
How Do I Tell Which Post Profile I Have?
Look at the cross-section. H-beam has flanges on both sides of the web. C-channel has a flange on one side only, forming a single open channel.
Does the Post Profile Matter for Post Caps?
Yes. Post caps are profile-specific, with separate H, C, 45°, LH and RH variants, so that's the part of the system where matching the shape does matter.
Browse the Fence Brackets collection and the Steel Posts collection.
Leave a comment (all fields required)