H20 (20 mm) Reinforcing Bar - BS (UK)

H20 (20 mm) is a BS (UK) reinforcing bar to BS 4449:2005. Its nominal diameter is 20 mm, giving a cross-section area As of 314.2 mm² and a mass of 2.466 kg/m. It is supplied in grade B500A / B500B / B500C with characteristic yield f_yk = 500 MPa. The tables below give the total steel area for 1-10 bars and the area per metre of width at common bar spacings.

Area As: 314.2 mm²
Diameter: 20 mm
Mass: 2.466 kg/m
f_yk: 500 MPa

Bar properties

d	Nominal diameter	20 mm
As	Cross-section area	314.2 mm²
m	Mass per metre	2.466 kg/m
u	Nominal perimeter	62.8 mm
f_yk	Characteristic yield	500 MPa

Total area for n bars (As = n × 314.2 mm²)

Bars	1	2	3	4	5	6	7	8	9	10
As (mm²)	314	628	943	1,257	1,571	1,885	2,199	2,514	2,828	3,142

Area per metre at spacing (As/m = 1000/s × 314.2 mm²)

s (mm)	75	100	125	150	175	200	250	300
As/m (mm²/m)	4,189	3,142	2,514	2,095	1,795	1,571	1,257	1,047

Source: BS 4449:2005. Area = π/4 × d² for metric bars; ASTM areas are the standard's tabulated nominal values. Grades available: B500A, B500B, B500C.

Other BS (UK) bar sizes

H8 (8 mm)H10 (10 mm)H12 (12 mm)H16 (16 mm)H25 (25 mm)H32 (32 mm)H40 (40 mm)

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