RHS 88.9x63.5x4.78 CISC · Weight & Dimensions

CISC, cold-formed sections · Rectangular Hollow Section

Rectangular Hollow Sections (RHS) are tubular profiles with excellent torsional resistance and aesthetic appeal. Used for columns, trusses, and exposed structural elements.

Also known as: PTR 88.9x63.5 cal 6 (México) · Caño estructural 88.9x63.5 (Argentina)

The RHS 88.9x63.5x4.78 steel profile weighs 10.3 kg/m (6.89 lb/ft), has a depth of 88.9 mm (3.50 in), flange width 63.5 mm (2.50 in). Cross-sectional area: 1,306.711 mm². Moment of inertia Ix = 136.147 cm⁴, Iy = 80.337 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4.78 mm ≈ 7 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	88.9 mm	3.50 in
Width (b)	63.5 mm	2.50 in
Thickness (t)	4.8 mm	0.19 in
Fillet radius (r)	9.6 mm	0.38 in
Weight	10.3 kg/m	6.89 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,306.71 mm²	2.025 in²
Moment of inertia (Ix)	136.15 cm⁴	3.27 in⁴
Moment of inertia (Iy)	80.34 cm⁴	1.93 in⁴
Elastic section modulus (Sx)	30.63 cm³	1.869 in³
Elastic section modulus (Sy)	25.3 cm³	1.544 in³
Plastic section modulus (Zx)	38.02 cm³	2.320 in³
Plastic section modulus (Zy)	30.09 cm³	1.836 in³
Radius of gyration (rx)	3.23 cm	1.271 in
Radius of gyration (ry)	2.48 cm	0.976 in