RHS 203x51x6.4 IMCA · Weight & Dimensions

IMCA, 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 203x51 cal 3 (México) · Caño estructural 203x51 (Argentina)

The RHS 203x51x6.4 steel profile weighs 23.2 kg/m (15.62 lb/ft), has a depth of 203 mm (7.99 in), flange width 51 mm (2.01 in). Cross-sectional area: 2,981.879 mm². Moment of inertia Ix = 1,258.886 cm⁴, Iy = 129.861 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 6.4 mm ≈ 3 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	203 mm	7.99 in
Width (b)	51 mm	2.01 in
Thickness (t)	6.4 mm	0.25 in
Fillet radius (r)	12.8 mm	0.50 in
Weight	23.2 kg/m	15.62 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	2,981.88 mm²	4.622 in²
Moment of inertia (Ix)	1,258.89 cm⁴	30.24 in⁴
Moment of inertia (Iy)	129.86 cm⁴	3.12 in⁴
Elastic section modulus (Sx)	124.03 cm³	7.569 in³
Elastic section modulus (Sy)	50.93 cm³	3.108 in³
Plastic section modulus (Zx)	169.35 cm³	10.335 in³
Plastic section modulus (Zy)	60.05 cm³	3.665 in³
Radius of gyration (rx)	6.5 cm	2.558 in
Radius of gyration (ry)	2.09 cm	0.822 in