Carbon Steel Square Bar-Carbon Steel

Dimensions and tolerances:

Carbon Steel Square Bar	Section Nominal Size (Square steel side length)	Allowable deviation
	Section Nominal Size (Square steel side length)	Group 1	Group 2	Group 3
	＞5.5~20	±0.25	±0.35	±0.40
	＞20~30	±0.30	±0.40	±0.50
	＞30~50	±0.40	±0.50	±0.60
	＞50~80	±0.60	±0.70	±0.80
	＞80~110	±0.90	±1.00	±1.10
	＞110~150	±1.20	±1.30	±1.40
	＞150~200	±1.60	±1.80	±2.00
	＞200~280	±2.00	±2.50	±3.00
	＞280~310	±2.50	±3.00	±4.00
	＞310~380	±3.00	±4.00	±5.00
Note: The unit is mm.

Length and tolerance:

Diagonal length:

Carbon Steel Square Bar

Nominal side length of square bar (a)

Diagonal length

≥

＜50mm

1.33 times the nominal side length

≥50mm

1.29 times the nominal side length

Curvature:

Hot Rolled Steel Square Bar

Group

Curvature per meter

Total curvature

(Carbon Steel Bar Length)

Group 1

≤2.5mm

≤0.25%

Group 2

≤4.0mm

≤0.40%

Dimensions and theoretical weight:

Carbon Steel Square Bar	Nominal side length of square bar a/mm	Theoretical weight/(kg/m)	Nominal side length of square bar a/mm	Theoretical weight/(kg/m)
	5.5	0.237	56	24.6
	6	0.283	58	26.4
	6.5	0.332	60	28.3
	7	0.385	63	31.2
	8	0.502	65	33.2
	9	0.636	68	36.3
	10	0.785	70	38.5
	11	0.950	75	44.2
	12	1.13	80	50.2
	13	1.33	85	56.7
	14	1.54	90	63.6
	15	1.77	95	70.8
	16	2.01	100	78.5
	17	2.27	105	86.5
	18	2.54	110	95.0
	19	2.83	115	104
	20	3.14	120	113
	21	3.46	125	123
	22	3.80	130	133
	23	4.15	135	143
	24	4.52	140	154
	25	4.91	145	165
	26	5.31	150	177
	27	5.72	155	189
	28	6.15	160	201
	29	6.60	165	214
	30	7.07	170	227
	31	7.54	180	254
	32	8.04	190	283
	33	8.55	200	314
	34	9.07	210	323
	35	9.62	220	344
	36	10.2	230	364
	38	11.3	240	385
	40	12.6	250	406
	42	13.8	260	426
	45	15.9	270	447
	48	18.1	280	468
	50	19.6	290	488
	53	22.1	300	509
	55	23.7
Note: The theoretical weight in the table is calculated according to the density of 7.85g/m³.

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