C-Shapes (Std Channels)

ASTM A6 · 31 sections

Free Reference Data

C-shapes (Standard Channels) are ASTM A6 channel sections with sloped inner flanges. Used in light framing, crane rails, and secondary structural members across North American construction.

Designation	h (mm)	b (mm)	t_w (mm)	t_f (mm)	A (cm²)	G (kg/m)	I_y (cm⁴)	W_y (cm³)
C 3×3.5	76	36	6.4	5.9	6.6	5.2	98.1	25.8
C 3×4.1	76	38	7.2	5.9	7.8	6.1	106	27.9
C 3×5	76	40	9	5.9	9.5	7.4	120	31.7
C 3×6	76	42	10.6	5.9	11.4	8.9	133	35
C 4×4.5	102	43	6.9	6.9	8.5	6.7	229	44.9
C 4×5.4	102	45	7.9	6.9	10.2	8	250	49.1
C 4×7.25	102	49	11.5	6.9	13.7	10.8	291	57
C 5×6.7	127	48	7.6	7.6	12.7	9.96	527	83
C 5×9	127	53	11.4	7.6	17	13.4	625	98.3
C 6×8.2	152	52	8.1	8.7	15.5	12.2	1050	138
C 6×10.5	152	56	10.4	8.7	19.9	15.6	1200	157
C 6×13	152	59	13	8.7	24.7	19.3	1360	179
C 7×9.8	178	57	8.4	9.3	18.5	14.6	1840	207
C 7×12.25	178	61	10.7	9.3	23.2	18.2	2090	234
C 7×14.75	178	64	13	9.3	27.9	21.9	2320	260
C 8×11.5	203	62	8.9	10.5	21.8	17.1	3290	325
C 8×13.75	203	65	10.6	10.5	26	20.5	3670	362
C 8×18.75	203	71	15.1	10.5	35.5	27.9	4520	446
C 9×13.4	229	66	9	11.1	25.3	19.9	5350	468
C 9×15	229	68	10.3	11.1	28.4	22.3	5850	511
C 9×20	229	73	14	11.1	37.9	29.8	7160	626
C 10×15.3	254	69	9.1	11.7	29	22.8	8820	695
C 10×20	254	73	12.2	11.7	37.9	29.8	10300	809
C 10×25	254	77	15.3	11.7	47.4	37.2	11900	936
C 10×30	254	80	18.3	11.7	56.9	44.7	13400	1050
C 12×20.7	305	77	9.9	13.1	39.2	30.8	21300	1400
C 12×25	305	80	12.7	13.1	47.4	37.2	24300	1590
C 12×30	305	83	15.2	13.1	56.9	44.7	27300	1790
C 15×33.9	381	89	10.7	15.3	64.2	50.4	64100	3370
C 15×40	381	92	13.5	15.3	75.8	59.5	71900	3780
C 15×50	381	97	18	15.3	94.8	74.4	84400	4440