HSS18x.5 — Dimensions and Section Properties

Dimensions and key properties

HSS18x.5 drawn to the proportions tabulated below. Every axis through the center is the same, so x and y are a convention.

Property	Value	Unit	Description
Weight	93.54	lb/ft	Nominal weight per foot
A	25.6	in²	Cross-sectional area
OD	18	in	Outside diameter
t	0.465	in	Design wall thickness
Ix	985	in⁴	Moment of inertia, strong axis
Sx	109	in³	Elastic section modulus, strong axis
Zx	143	in³	Plastic section modulus, strong axis
rx	6.2	in	Radius of gyration, strong axis
Iy	985	in⁴	Moment of inertia, weak axis
Sy	109	in³	Elastic section modulus, weak axis
Zy	143	in³	Plastic section modulus, weak axis
ry	6.2	in	Radius of gyration, weak axis

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ASTM A500 Grade C
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