HSS18 Tube Sizes

The HSS18 series runs 24 sizes, from HSS18x18x1 at 222.63 lb/ft to HSS18x6x1/4 at 39.43 lb/ft. They share a nominal height, so the sizes in it run across every width and wall thickness rolled at that depth.

HSS18 sizes, heaviest first

Size	lb/ft	H (in)	B (in)	t (in)	A (in²)	Ix (in⁴)	Sx (in³)	Zx (in³)
HSS18x18x1	222.63	18	18	0.93	61.3	2,920	324	387
HSS18x18x7/8	197.24	18	18	0.814	54.3	2,630	292	346
HSS18x18x3/4	171.16	18	18	0.698	47.1	2,320	258	302
HSS18x18x5/8	144.39	18	18	0.581	39.6	1,980	220	257
HSS18x18x1/2	116.91	18	18	0.465	32.1	1,630	181	210
HSS18x10x5/8	110.36	18	10	0.581	30.3	1,280	142	176
HSS18x6x3/4	109.91	18	6	0.698	30.3	1,060	118	158
HSS18x8x5/8	101.85	18	8	0.581	28	1,100	122	156
HSS18x6x5/8	93.34	18	6	0.581	25.7	923	103	135
HSS18x10x1/2	89.68	18	10	0.465	24.6	1,060	117	144
HSS18x18x3/8	88.73	18	18	0.349	24.3	1,250	139	160
HSS18x8x1/2	82.88	18	8	0.465	22.8	913	101	128
HSS18x6x1/2	76.07	18	6	0.465	20.9	770	85.6	112
HSS18x18x5/16	74.38	18	18	0.291	20.4	1,060	118	135
HSS18x10x3/8	68.31	18	10	0.349	18.7	820	91.1	111
HSS18x8x3/8	63.21	18	8	0.349	17.3	711	79	98.7
HSS18x18x1/4	59.85	18	18	0.233	16.4	860	95.6	109
HSS18x6x3/8	58.1	18	6	0.349	16	602	66.9	86.4
HSS18x10x5/16	57.36	18	10	0.291	15.7	695	77.2	93.7
HSS18x8x5/16	53.11	18	8	0.291	14.6	604	67.1	83.4
HSS18x6x5/16	48.86	18	6	0.291	13.4	513	57	73.1
HSS18x10x1/4	46.24	18	10	0.233	12.7	566	62.9	76
HSS18x8x1/4	42.84	18	8	0.233	11.8	492	54.7	67.7
HSS18x6x1/4	39.43	18	6	0.233	10.8	419	46.5	59.4

Relevant tools

Steel Shape Properties Table
search and compare across every series
Beam Shear, Moment and Deflection Diagram Calculator
check a span made up of one of these sizes
All Shape Series
every published series, W-shapes through round HSS

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