125x75x4.0RHS

125x75x4.0RHS Rectangular Hollow Section

Weight Surface area Equivalents XML

Mass11.73kg/m

A1,495mm²

Ix3.10710⁶ mm⁴

Zx49.710³ mm³

Cross-section drawn to scale from nominal dimensions. Cross-hair marks the centroid.

Dimensions

Parameter	Symbol	Value	Unit	Data
Depth	d	125.0	mm	U
Width	b	75.0	mm	U
Thickness	t	4.0	mm	U
Outer corner radius (assumed)	ro	8.0	mm	U

Parameter	Symbol	Value	Unit	Data
General
Mass per metre	mass	11.73	kg/m	C
Gross area	A	1,495	mm²	C
About x-axis (major)
Second moment of area Ix	Ix	3.107	10⁶ mm⁴	C
Elastic section modulus Zx (min)	Zx	49.7	10³ mm³	C
Plastic section modulus Sx	Sx	61.1	10³ mm³	C
Radius of gyration rx	rx	45.6	mm	C
About y-axis (minor)
Second moment of area Iy	Iy	1.406	10⁶ mm⁴	C
Elastic section modulus Zy (min)	Zy	37.5	10³ mm³	C
Plastic section modulus Sy	Sy	43.0	10³ mm³	C
Radius of gyration ry	ry	30.7	mm	C
Torsion & warping
Torsion constant JThin-walled closed-section approximation	J	3.145	10⁶ mm⁴	C
Surface area
External surface area	extArea	0.386	m²/m	C
Internal surface area	intArea	0.361	m²/m	C

Grade	Standard	fy MPa	fu MPa	Note	Data
C450L0	AS/NZS 1163:2016	450	500	Typical grade for SHS/RHS – confirm with supplier	U
C350L0	AS/NZS 1163:2016	350	430	Available for some sizes – confirm with supplier	U

Strengths shown for governing thickness t = 4.0 mm. Density 7850 kg/m³, E = 200 000 MPa.

Source publisher: Pending verification – nominal dimensions entered by the application developer
Source document: AS/NZS 1163:2016 Cold-formed structural steel hollow sections
Edition: 2016
Publication year: 2016
Page reference: —
Last updated: 2026-10-12
Verification status: Unverified

Outer corner radius assumed as 2.0t for property calculation; confirm against AS/NZS 1163 and the manufacturer catalogue. Typical grade: C450L0.