#10 (No. 10) Reinforcing Bar - ASTM (US)

#10 (No. 10) is a ASTM (US) reinforcing bar to ASTM A615 / A706 (Table 1). Its nominal diameter is 1.27 in (32.3 mm), giving a cross-section area As of 1.27 in² (819 mm²) and a mass of 4.303 lb/ft (6.404 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: 1.27 in² (819 mm²)
Diameter: 1.27 in (32.3 mm)
Mass: 4.303 lb/ft (6.404 kg/m)
f_yk: 420 MPa

Bar properties

d	Nominal diameter	1.27 in / 32.3 mm
As	Cross-section area	1.27 in² / 819 mm²
m	Mass per metre	4.303 lb/ft / 6.404 kg/m
u	Nominal perimeter	101.5 mm
f_yk	Characteristic yield	420 MPa

Total area for n bars (As = n × 1.27 in²)

Bars	1	2	3	4	5	6	7	8	9	10
As (in²)	1.27	2.54	3.81	5.08	6.35	7.62	8.89	10.16	11.43	12.70

Area per foot at spacing (As/ft = 12/s × 1.27 in²)

s (in)	3	4	5	6	8	10	12	18
As/ft (in²/ft)	5.08	3.81	3.05	2.54	1.91	1.52	1.27	0.85

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)#4 (No. 4)#5 (No. 5)#6 (No. 6)#7 (No. 7)#8 (No. 8)#9 (No. 9)#11 (No. 11)#14 (No. 14)#18 (No. 18)

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