RHS 178x127x6.4 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 178x127 cal 3 (México) · Caño estructural 178x127 (Argentina)

The RHS 178x127x6.4 steel profile weighs 28.3 kg/m (19.02 lb/ft), has a depth of 178 mm (7.01 in), flange width 127 mm (5.00 in). Cross-sectional area: 3,634.679 mm². Moment of inertia Ix = 1,596.898 cm⁴, Iy = 947.192 cm⁴.

Cross-section (not to scale)

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

Dimensions

Property	Metric	Imperial
Depth (h)	178 mm	7.01 in
Width (b)	127 mm	5.00 in
Thickness (t)	6.4 mm	0.25 in
Fillet radius (r)	12.8 mm	0.50 in
Weight	28.3 kg/m	19.02 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	3,634.68 mm²	5.634 in²
Moment of inertia (Ix)	1,596.9 cm⁴	38.37 in⁴
Moment of inertia (Iy)	947.19 cm⁴	22.76 in⁴
Elastic section modulus (Sx)	179.43 cm³	10.949 in³
Elastic section modulus (Sy)	149.16 cm³	9.103 in³
Plastic section modulus (Zx)	217.55 cm³	13.276 in³
Plastic section modulus (Zy)	172.55 cm³	10.530 in³
Radius of gyration (rx)	6.63 cm	2.610 in
Radius of gyration (ry)	5.1 cm	2.010 in