Beams, channels & columns · Size & tolerance table

JIS and Chinese channels (JIS G3192, GB/T 706)

Standard: JIS G3192 · GB/T 706

Asian mills sell channels by depth × flange width × web thickness, with the mass per metre that decides the price. Chinese channels are also known by a number — the depth in centimetres — with a, b or c for increasing web thickness ([20a, [20b).

Only some of the sizes in the first table are JIS G3192 standard sections; the others are sizes rolled by individual mills, including old British inch sizes (102 × 51, 127 × 64, 152 × 76). Confirm the flange thickness with the mill, as it is not part of the size as quoted.

Channels traded from Japanese and other Asian mills

Size (h × b × tw) mm	G kg/m	JIS G3192 section mm
75 × 40 × 3.8	5.3	–
75 × 40 × 5.0	6.92	75 × 40 × 5 × 7
100 × 50 × 3.8	7.3	–
100 × 50 × 4.5	8.97	–
100 × 50 × 5.0	9.36	100 × 50 × 5 × 7.5
102 × 51 × 6.1	10.42	–
125 × 65 × 5.2	11.66	–
125 × 65 × 5.5	12.91	–
125 × 65 × 6.0	13.4	125 × 65 × 6 × 8
127 × 64 × 6.4	14.91	–
150 × 75 × 5.5	14.66	–
150 × 75 × 5.8	16.71	–
150 × 75 × 6.0	18.01	–
150 × 75 × 6.5	18.6	150 × 75 × 6.5 × 10
150 × 75 × 9.0	24	150 × 75 × 9 × 12.5
152 × 76 × 6.4	17.9	–
152 × 89 × 7.1	23.9	–

Chinese hot-rolled channels to GB/T 706

No.	Size (h × b × tw) mm	G kg/m
8	80 × 43 × 5.0	8.045
–	100 × 50 × 4.2	8.03
–	100 × 50 × 5.0	9.36
12	120 × 53 × 5.5	12.059
14a	140 × 58 × 6.0	14.535
14b	140 × 60 × 8.0	16.733
16a	160 × 63 × 6.5	17.24
16b	160 × 65 × 8.5	19.754
18a	180 × 68 × 7.0	20.174
18b	180 × 70 × 9.0	23
20a	200 × 73 × 7.0	22.637
20b	200 × 75 × 9.0	25.777
22a	220 × 77 × 7.0	24.999
22b	220 × 79 × 9.0	28.453
25a	250 × 78 × 7.0	27.41
25b	250 × 80 × 9.0	31.335
25c	250 × 82 × 11	35.26
28a	280 × 82 × 7.5	31.427
28b	280 × 84 × 9.5	35.823
28c	280 × 86 × 11.5	40.219
30a	300 × 85 × 7.5	34.463
30b	300 × 87 × 9.5	39.173
30c	300 × 89 × 11.5	43.883
32a	320 × 88 × 8.0	38.083
32b	320 × 90 × 10.0	43.107
32c	320 × 92 × 12.0	48.131

Chinese light channels (mill sizes)

Thinner-walled channels rolled by Chinese mills in the GB/T 706 depths; they are not GB/T 706 sections.

Size (h × b × tw) mm	G kg/m
100 × 48 × 5.2	9.206
120 × 53 × 5.4	11.094
140 × 58 × 5.9	13.372
140 × 60 × 7.9	15.227
160 × 63 × 6.4	15.861
160 × 65 × 8.5	17.974
180 × 68 × 6.8	18.560
180 × 70 × 9.0	20.930
200 × 73 × 7.0	20.826
200 × 75 × 9.0	23.715
220 × 77 × 7.0	22.999
220 × 79 × 9.0	26.171
250 × 78 × 7.0	25.217
250 × 80 × 9.0	28.828
280 × 82 × 7.4	28.913
280 × 84 × 9.5	32.957
300 × 85 × 7.4	31.706
300 × 87 × 9.5	36.039

Notes

A size listed twice in the legacy table (100 × 50 × 5.0 at 9.36 and at 10.2 kg/m) is shown once, with the JIS mass; the second figure belongs to a section with a thicker flange.