323.9 CHS — Sizes, Dimensions & Properties
9 sizes in the 323.9 serial size group. All dimensions in mm, section properties in cm units.
| Designation | Mass (kg/m) | D (mm) | t (mm) | A (cm2) | I (cm4) | Z (cm3) | S (cm3) | r (cm) |
|---|---|---|---|---|---|---|---|---|
| 323.9x5.0 | 39.3 | 323.9 | 5 | 50.1 | 6,370 | 393 | 509 | 11.3 |
| 323.9x6.0 | 47 | 323.9 | 6 | 59.9 | 7,570 | 468 | 606 | 11.2 |
| 323.9x6.3 | 49.3 | 323.9 | 6.3 | 62.9 | 7,930 | 490 | 636 | 11.2 |
| 323.9x8.0 | 62.3 | 323.9 | 8 | 79.4 | 9,910 | 612 | 799 | 11.2 |
| 323.9x10.0 | 77.4 | 323.9 | 10 | 98.6 | 12,200 | 751 | 986 | 11.1 |
| 323.9x12.0 | 92.3 | 323.9 | 12 | 118 | 14,300 | 884 | 1,170 | 11 |
| 323.9x12.5 | 96 | 323.9 | 12.5 | 122 | 14,800 | 917 | 1,210 | 11 |
| 323.9x14.2 | 108 | 323.9 | 14.2 | 138 | 16,600 | 1,030 | 1,360 | 11 |
| 323.9x16.0 | 121 | 323.9 | 16 | 155 | 18,400 | 1,140 | 1,520 | 10.9 |
323.9x5.0 CHS
- Designation
- 323.9x5.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 5 mm
- Mass per Metre
- 39.3 kg/m
- Cross-Sectional Area
- 50.1 cm2
- Second Moment of Area I
- 6,370 cm4
- Elastic Modulus Z
- 393 cm3
- Plastic Modulus S
- 509 cm3
- Radius of Gyration r
- 11.3 cm
- Torsional Constant (It)
- 12,700 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 25.9 m2/t
323.9x6.0 CHS
- Designation
- 323.9x6.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 6 mm
- Mass per Metre
- 47 kg/m
- Cross-Sectional Area
- 59.9 cm2
- Second Moment of Area I
- 7,570 cm4
- Elastic Modulus Z
- 468 cm3
- Plastic Modulus S
- 606 cm3
- Radius of Gyration r
- 11.2 cm
- Torsional Constant (It)
- 15,100 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 21.6 m2/t
323.9x6.3 CHS
- Designation
- 323.9x6.3
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 6.3 mm
- Mass per Metre
- 49.3 kg/m
- Cross-Sectional Area
- 62.9 cm2
- Second Moment of Area I
- 7,930 cm4
- Elastic Modulus Z
- 490 cm3
- Plastic Modulus S
- 636 cm3
- Radius of Gyration r
- 11.2 cm
- Torsional Constant (It)
- 15,900 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 20.6 m2/t
323.9x8.0 CHS
- Designation
- 323.9x8.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 8 mm
- Mass per Metre
- 62.3 kg/m
- Cross-Sectional Area
- 79.4 cm2
- Second Moment of Area I
- 9,910 cm4
- Elastic Modulus Z
- 612 cm3
- Plastic Modulus S
- 799 cm3
- Radius of Gyration r
- 11.2 cm
- Torsional Constant (It)
- 19,800 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 16.3 m2/t
323.9x10.0 CHS
- Designation
- 323.9x10.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 10 mm
- Mass per Metre
- 77.4 kg/m
- Cross-Sectional Area
- 98.6 cm2
- Second Moment of Area I
- 12,200 cm4
- Elastic Modulus Z
- 751 cm3
- Plastic Modulus S
- 986 cm3
- Radius of Gyration r
- 11.1 cm
- Torsional Constant (It)
- 24,300 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 13.1 m2/t
323.9x12.0 CHS
- Designation
- 323.9x12.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 12 mm
- Mass per Metre
- 92.3 kg/m
- Cross-Sectional Area
- 118 cm2
- Second Moment of Area I
- 14,300 cm4
- Elastic Modulus Z
- 884 cm3
- Plastic Modulus S
- 1,170 cm3
- Radius of Gyration r
- 11 cm
- Torsional Constant (It)
- 28,600 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 11 m2/t
323.9x12.5 CHS
- Designation
- 323.9x12.5
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 12.5 mm
- Mass per Metre
- 96 kg/m
- Cross-Sectional Area
- 122 cm2
- Second Moment of Area I
- 14,800 cm4
- Elastic Modulus Z
- 917 cm3
- Plastic Modulus S
- 1,210 cm3
- Radius of Gyration r
- 11 cm
- Torsional Constant (It)
- 29,700 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 10.6 m2/t
323.9x14.2 CHS
- Designation
- 323.9x14.2
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 14.2 mm
- Mass per Metre
- 108 kg/m
- Cross-Sectional Area
- 138 cm2
- Second Moment of Area I
- 16,600 cm4
- Elastic Modulus Z
- 1,030 cm3
- Plastic Modulus S
- 1,360 cm3
- Radius of Gyration r
- 11 cm
- Torsional Constant (It)
- 33,200 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 9.38 m2/t
323.9x16.0 CHS
- Designation
- 323.9x16.0
- Outside Diameter (D)
- 323.9 mm
- Wall Thickness (t)
- 16 mm
- Mass per Metre
- 121 kg/m
- Cross-Sectional Area
- 155 cm2
- Second Moment of Area I
- 18,400 cm4
- Elastic Modulus Z
- 1,140 cm3
- Plastic Modulus S
- 1,520 cm3
- Radius of Gyration r
- 10.9 cm
- Torsional Constant (It)
- 36,800 cm4
- Surface Area per Metre
- 1.02 m2/m
- Surface Area per Tonne
- 8.38 m2/t
323.9 CHS — Overview
The 323.9 serial size group contains 9 sections, ranging from 121 kg/m to 39.3 kg/m. All sections in this group share the same nominal depth and width but differ in web and flange thickness, which affects the weight and structural capacity.
Section properties are sourced from the Tata Steel Blue Book / SCI P363. For structural design to BS EN 1993-1-1 (Eurocode 3), use these properties with the appropriate partial factors from the UK National Annex.
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Section properties from Tata Steel Blue Book / SCI P363 / BS 4-1:2005.