RHS 88.9x63.5x3.81 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 8 (México) · Caño estructural 88.9x63.5 (Argentina)

The RHS 88.9x63.5x3.81 steel profile weighs 8.4 kg/m (5.62 lb/ft), has a depth of 88.9 mm (3.50 in), flange width 63.5 mm (2.50 in). Cross-sectional area: 1,065.841 mm². Moment of inertia Ix = 114.595 cm⁴, Iy = 67.906 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.81 mm ≈ 9 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)	3.8 mm	0.15 in
Fillet radius (r)	7.6 mm	0.30 in
Weight	8.4 kg/m	5.62 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,065.84 mm²	1.652 in²
Moment of inertia (Ix)	114.6 cm⁴	2.75 in⁴
Moment of inertia (Iy)	67.91 cm⁴	1.63 in⁴
Elastic section modulus (Sx)	25.78 cm³	1.573 in³
Elastic section modulus (Sy)	21.39 cm³	1.305 in³
Plastic section modulus (Zx)	31.54 cm³	1.924 in³
Plastic section modulus (Zy)	25.01 cm³	1.526 in³
Radius of gyration (rx)	3.28 cm	1.291 in
Radius of gyration (ry)	2.52 cm	0.994 in