Channels / ‘C’ Section Beams

Section Designation		Square Feet of Surface Area per Foot of Length		Square Feet of Surface Area per Ton
		Minus one flange side	All around	Minus one flange side	All around
C-15	x 50	3.44	3.75	137.6	150.0
	x 40	3.38	3.67	169.0	183.5
	x 33.9	3.34	3.63	197.1	214.2
C-12	x 30	2.78	3.04	185.3	202.7
	x 25	2.75	3.00	220.0	240.0
	x 20.7	2.75	3.00	265.7	289.9
C-10	x 30	2.42	2.67	161.3	178.0
	x 25	2.39	2.63	191.2	210.4
	x 20	2.35	2.58	235.0	258.0
	x 15.3	2.32	2.54	305.3	334.2
C-9	x 20	2.16	2.38	216.0	238.0
	x 15	2.13	2.33	284.0	310.7
	x 13.4	2.09	2.29	311.9	341.8
C-8	x 18.75	1.96	2.17	209.1	231.5
	x 13.75	1.93	2.13	280.7	309.8
	x 11.5	1.90	2.08	330.4	361.7
C-7	x 14.75	1.73	1.92	234.6	260.3
	x 12.25	1.73	1.92	282.4	313.5
	x 9.8	1.70	1.88	346.9	383.7
C-6	x 13	1.53	1.71	235.4	263.1
	x 10.5	1.50	1.67	285.7	318.1
	x 8.2	1.47	1.63	358.5	397.6
C-5	x 9	1.30	1.46	288.9	324.4
	x 6.7	1.27	1.42	379.1	423.9
C-4	x 7.25	1.10	1.25	295.2	344.8
	x 5.4	1.07	1.21	396.3	448.1
C-3	x 6	0.91	1.04	303.3	346.7
	x 5	0.88	1.00	352.0	400.0
	x 4.1	0.84	0.96	409.8	468.3
MC-18	x 58	4.06	4.42	140.0	152.4
	x 51.9	4.03	4.38	155.3	168.8
	x 45.8	4.00	4.33	176.7	189.1
	x 42.7	4.00	4.33	187.4	202.8
MC-13	x 50	3.26	3.63	130.4	145.2
	x 40	3.20	3.54	160.0	177.0
	x 35	3.20	3.54	182.9	202.3
	x 31.8	3.17	3.50	199.4	220.1
MC-12	x 50	3.03	3.38	121.2	135.2
	x 45	3.00	3.33	133.3	148.0
	x 40	2.97	3.29	148.5	164.5
	x 35	2.94	3.25	168.0	185.7
	x 37	2.91	3.21	157.3	173.5
	x 32.9	2.88	3.17	175.1	192.7
	x 30.9	2.88	3.17	186.4	205.2
MC-10	x 41.1	2.76	3.13	134.3	152.3
	x 33.6	2.70	30.4	160.7	181.0
	x 28.5	2.67	3.00	187.4	210.5
	x 28.3	2.54	2.83	179.5	200.0
	x 25.3	2.54	2.83	200.8	223.7
	x 24.9	2.51	2.79	201.6	224.1
	x 21.9	2.54	2.83	232.0	258.4
MC-9	x 25.4	2.38	2.67	187.4	210.2
	x 23.9	2.38	2.67	199.2	223.4
MC-8	x 22.8	2.21	2.50	193.9	219.3
	x 21.4	2.21	2.50	206.5	233.6
	x 20	2.08	2.33	208.0	233.0
	x 18.7	2.08	2.33	222.5	249.2
MC-7	x 22.7	2.07	2.38	182.4	209.7
	x 19.1	2.04	2.33	213.6	244.0
	x 17.6	1.92	2.17	218.2	246.6
MC-6	x 18	1.88	2.17	208.9	241.1
	x 15.3	1.88	2.17	245.8	283.7
	x 16.3	1.75	2.00	214.7	245.4
	x 15.1	1.75	2.00	231.8	264.9
	x 12	1.63	1.83	271.7	305.0
MC-3	x 9	1.03	1.21	228.9	268.9
	x 7.1	1.00	1.17	281.7	329.6

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