Product · CHS
CHS Steel Supply
Circular Hollow Section steel to AS/NZS 1163 — bulk supply for fence posts, rails, rural fencing and wildlife fencing applications.
Specification & Supply
CHS is widely used for round fence posts, top rails and rural and wildlife fencing systems. We supply the common fencing-range nominal bore sizes (33NB through 114NB) in pre-galvanised and hot-dip galvanised finishes — stock packs, cut-to-length and mill direct bulk supply for fencing contractors, fabricators and rural programs. Subject to availability on larger project orders.
- AS/NZS 1163 manufactured
- Sizes 33NB · 40NB · 50NB · 65NB · 89NB · 114NB
- Pre-galvanised and HDG finishes
- Round posts and top rails
- Cut to length and standard stock lengths
- Mill direct on project quantities
Specifications
AS/NZS 1163| Product Type | Circular Hollow Section (CHS) |
|---|---|
| Steel Grade | Available in a range of structural grades including AS/NZS 1163 C250L0 and C350L0 depending on section size, wall thickness and mill source |
| Australian Standard | AS/NZS 1163 |
| Finish | Black · Pre-galvanised · Hot dip galvanised |
| Available Sizes (fencing range) | 33NB · 40NB · 50NB · 65NB · 89NB · 114NB nominal bore |
| Standard Lengths | 6.0m · 7.5m · 9.0m · cut-to-length available |
| Common Applications | Fence rails, commercial fencing posts, rural fencing, wildlife fencing, handrails |
Common CHS Rail & Post Sizes
Nominal bore · subject to availability| Nominal Bore | Outside Diameter | Typical Use |
|---|---|---|
| 33NB CHS | 42.4 mm OD | Top rail for residential and commercial chainwire fencing |
| 40NB CHS | 48.3 mm OD | Heavy top rail, light brace and stay sections |
| 50NB CHS | 60.3 mm OD | Rural fencing posts, light strainer posts |
| 65NB CHS | 76.1 mm OD | Standard rural and wildlife fencing line posts |
| 89NB CHS | 101.6 mm OD | Strainer posts, gate posts, heavy rural |
| 114NB CHS | 114.3 mm OD | Heavy strainer assemblies, exclusion fencing end posts |
Fence Rail Systems
Top Rail (33NB)
42.4mm OD CHS — the standard top rail size for chainwire mesh attached with tie wire or rail end fittings.
Heavy Top Rail (40NB)
48.3mm OD CHS for long-span and heavier mesh installations on commercial and industrial sites.
Brace & Stay (40-50NB)
Bracing diagonals for strainer assemblies on rural and exclusion fencing programs.
Tubular Fencing
Pre-galvanised CHS for tubular pool, balustrade and decorative fence systems.
Rural & Wildlife Applications
Line Posts
50NB and 65NB CHS line posts for boundary, paddock and exclusion fencing across remote pastoral country.
Strainer Assemblies
89NB and 114NB CHS strainers with stays — the backbone of high-tensile rural fence runs.
Koala & Fauna Fencing
Smooth-finish galvanised CHS posts suit fauna-friendly fencing where climbing surfaces must be minimised.
Conservation Fencing
Heavy CHS strainer and corner assemblies for cluster, exclusion and conservation programs — palletised ready for site.
Stock, Lengths & Delivery
- Available in common stock lengths including 6.0m, 7.5m and 9.0m depending on product and availability.
- Cut-to-length supply available on request — supply your cutting list with your quote.
- Bulk and project quantities available — mill direct pricing on larger orders, subject to availability.
Why contractors buy steel from us
Trade WholesaleMill direct supply
Sourced direct from Australian and approved overseas mills — bulk pricing without the merchant markup.
AS/NZS compliant
Steel manufactured to recognised Australian Standards. Mill certificates supplied on request for engineered jobs.
Cut to length
Mill lengths, standard fencing lengths or cut-to-size packs — palletised ready for site.
Australia-wide freight
Direct truck loads, part loads and palletised freight to metro, regional and remote project sites.
Bulk & project quantities
From single pack to full mill order — priced for fencing contractors, fabricators and infrastructure programs.
Trade-only pricing
We supply the trade — fencing contractors, fabricators, steel merchants, landscapers and government buyers.
Frequently Asked Questions
What size CHS is used for chainwire top rail?+
33NB CHS (42.4mm OD) is the Australian standard top rail size for residential and commercial chainwire fencing. 40NB (48.3mm OD) is used for heavy commercial and long-span applications.
What CHS sizes do you stock for rural fencing posts?+
We stock 50NB, 65NB, 89NB and 114NB CHS in pre-galvanised and hot-dip galvanised finish — common stock sizes for line posts, strainers and corner assemblies.
Is your CHS suitable for koala and wildlife exclusion fencing?+
Yes. Smooth-finish galvanised CHS posts are widely used on koala, fauna and conservation exclusion fencing where minimising climbing surfaces and corrosion are critical.
Can you supply custom cut lengths?+
Yes — custom lengths available on project orders. Standard stock lengths are 6.0m, 7.5m and 9.0m, with cut-to-length cutting and palletising available.
Do you offer mill direct supply on bulk quantities?+
Mill direct supply is available on full pack and full container project quantities, subject to availability. Trade pricing applies to bulk and contractor orders.