Wire mesh & welded fabric · Size & tolerance table

BS 4483 welded steel fabric for concrete — standard A, B, C and D fabrics

Standard: BS 4483 (fabric) · BS 4449 / BS 4482 (wire)

Preferred welded fabrics for reinforced concrete, the 'mesh' used for slabs, ground-bearing floors, screeds, walls and precast. The number in the name is the cross-section area of the main (longitudinal) wires in mm² per metre width: A393 has 393 mm² of steel per metre each way.

A — square mesh, the same wire both ways at 200 mm. B — structural mesh, main wires at 100 mm and cross wires at 200 mm. C — long mesh for one-way spans, main wires at 100 mm with light cross wires at 400 mm. D — light wrapping fabric. Standard sheets are 4.8 m × 2.4 m.

Preferred fabrics

Fabric	Main wires			Cross wires			Mass
Reference	Size mm	Pitch mm	Area mm²/m	Size mm	Pitch mm	Area mm²/m	Mass kg/m²
A393	10	200	393	10	200	393	6.16
A252	8	200	252	8	200	252	3.95
A193	7	200	193	7	200	193	3.02
A142	6	200	142	6	200	142	2.22
A98	5	200	98	5	200	98	1.54
B1131	12	100	1131	8	200	252	10.90
B785	10	100	785	8	200	252	8.14
B503	8	100	503	8	200	252	5.93
B385	7	100	385	7	200	193	4.53
B283	6	100	283	7	200	193	3.73
B196	5	100	196	7	200	193	3.05
C785	10	100	785	6	400	71	6.72
C636	9	100	636	6	400	71	5.55
C503	8	100	503	5	400	49	4.34
C385	7	100	385	5	400	49	3.41
C283	6	100	283	5	400	49	2.61
D98	5	200	98	5	200	98	1.54
D49	2.5	100	49	2.5	100	49	0.77

Notes

Mass per m² is the mass of the wires at 7,850 kg/m³: for example B1131 = 12 mm (0.888 kg/m) × 10 m/m² + 8 mm (0.395 kg/m) × 5 m/m² = 10.9 kg/m². Every row was recalculated this way.
A 4.8 × 2.4 m sheet (11.52 m²) of A393 weighs about 71 kg and of A142 about 26 kg.
Wires are ribbed or indented, grade B500A, B500B or B500C. Sheets with other sizes, pitches and overhangs ('purpose-made' or 'cut and bent' fabric) are made to order.