#4 (No. 4) Reinforcing Bar - ASTM (US)

#4 (No. 4) is a ASTM (US) reinforcing bar to ASTM A615 / A706 (Table 1). Its nominal diameter is 0.5 in (12.7 mm), giving a cross-section area As of 0.2 in² (129 mm²) and a mass of 0.668 lb/ft (0.994 kg/m). It is supplied in grade Gr.60 / Gr.75 / Gr.80 with characteristic yield f_yk = 420 MPa. The tables below give the total steel area for 1-10 bars and the area per foot of width at common bar spacings.

Area As: 0.2 in² (129 mm²)
Diameter: 0.5 in (12.7 mm)
Mass: 0.668 lb/ft (0.994 kg/m)
f_yk: 420 MPa

Bar properties

d	Nominal diameter	0.5 in / 12.7 mm
As	Cross-section area	0.2 in² / 129 mm²
m	Mass per metre	0.668 lb/ft / 0.994 kg/m
u	Nominal perimeter	39.9 mm
f_yk	Characteristic yield	420 MPa

Total area for n bars (As = n × 0.2 in²)

Bars	1	2	3	4	5	6	7	8	9	10
As (in²)	0.20	0.40	0.60	0.80	1.00	1.20	1.40	1.60	1.80	2.00

Area per foot at spacing (As/ft = 12/s × 0.2 in²)

s (in)	3	4	5	6	8	10	12	18
As/ft (in²/ft)	0.80	0.60	0.48	0.40	0.30	0.24	0.20	0.13

Source: ASTM A615 / A706 (Table 1). Area = π/4 × d² for metric bars; ASTM areas are the standard's tabulated nominal values. Grades available: Gr.60, Gr.75, Gr.80.

Other ASTM (US) bar sizes

#3 (No. 3)#5 (No. 5)#6 (No. 6)#7 (No. 7)#8 (No. 8)#9 (No. 9)#10 (No. 10)#11 (No. 11)#14 (No. 14)#18 (No. 18)

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