Guide · CHS Sizes
CHS Sizes for Round Fence Posts & Rails
A reference for the circular hollow section nominal bore sizes used in Australian fencing — round posts, top rails and rural systems.
Specification & Supply
CHS is referenced by nominal bore (NB), not external diameter. The sizes below are the everyday fencing-industry range, supplied to AS/NZS 1163 in pre-galvanised and hot-dip galvanised finishes for round posts, top rails, rural fence lines and wildlife fencing — subject to availability on bulk project orders.
- 33NB CHS — lighter rural posts and top rails (~42.4mm OD)
- 40NB CHS — rural posts and rails (~48.3mm OD)
- 50NB CHS — standard rural and commercial post (~60.3mm OD)
- 65NB CHS — heavier commercial post (~76.1mm OD)
- 89NB CHS — heavy commercial / wildlife post (~101.6mm OD)
- 114NB CHS — heavy gate and infrastructure post (~127.0mm OD)
Specifications
AS/NZS 1163| 33NB CHS | OD ~42.4 mm — light rural posts and top rails |
|---|---|
| 40NB CHS | OD ~48.3 mm — rural and commercial top rails |
| 50NB CHS | OD ~60.3 mm — standard round fence post |
| 65NB CHS | OD ~76.1 mm — heavier commercial post |
| 89NB CHS | OD ~101.6 mm — heavy commercial and wildlife post |
| 114NB CHS | OD ~127.0 mm — heavy gate and infrastructure post |
| Stock Lengths | Posts 1.8 / 2.1 / 2.4 / 3.0 m · Mill 6.0–9.0 m · cut-to-length |
| Standard | AS/NZS 1163 — typical grades C250L0 / C350L0 |
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