Index

Soft Metric and Imperial Standards

ASTM Standard Reinforcing Bars
Soft Metric Size	Nom Diam mm		Area mm^2		Weight Factors				Imperial Size		Nom Diam inches		Area in^2	Weight Factors
					kg/m		kg/ft							lb/ft	lb/m
10	9.5		71		.560		.171		3		.375		.11	.376	1.234
13	12.7		129		.994		.303		4		.500		.20	.668	2.192
16	15.9		199		1.552		.473		5		.625		.31	1.043	3.422
19	19.1		284		2.235		.681		6		.750		.44	1.502	4.928
22	22.2		387		3.042		.927		7		.875		.60	2.044	6.706
25	25.4		510		3.973		1.211		8		1.000		.79	2.670	8.760
29	28.7		645		5.060		1.542		9		1.128		1.00	3.400	11.155
32	32.3		819		6.404		1.952		10		1.270		1.27	4.303	14.117
36	35.8		1006		7.907		2.410		11		1.410		1.56	5.313	17.431
43	43.0		1452		11.384		3.470		14		1.693		2.25	7.650	25.098
57	57.3		2581		20.239		6.169		18		2.257		4.00	13.600	44.619
Comparison of Steel Grades
Soft Metric						Imperial
Grade		MPa		Psi		Grade				MPa		Psi
300		300		43,511		40				257.79		40,000
420		420		60,716		60				413.69		60,000
520		520		75,420		75				517.11		75,000
Conversion Factors
To Metric								To Imperial
1/8 inch = 3.175 mm
1 inch = 25.4 mm								1 mm = 0.0394 inches
1 foot = 304.8 mm								1 meter = 3.2808 feet
1000 ft^2 = 92.903 m^2								100 m^2 = 1076.39 ft^2
1000 ft^3 = 28.317 m^3								10m^3 = 353.14 ft^3
1000 gal = 3.7854 m^3								10m^3 = 2.641.73
1 pound = 0.4536 kg								1 kg = 2.2046 pounds
1 psf = 4.88243 kg/m^2								10 kg/m^2 = 2.048 psf
1 pcf = 16.019 kg/m^3								10 kg/m^3 = 0.624 pcf
short ton = 907.18 kg (2000 lbs.)								0.90718 = 2000 pounds tonne
long ton = 1016 kg (2240 lbs.)								1 tonne = 2204.6 pounds
1000 psi = 6.8948 MPa								1 MPa = 145.0368 psi
Newton (N) = kg m/s^2 = kilograms x 9.80665 Pascal (Pa) = N/m2

Uncoated Seven Wire Low-Relaxation Steel Strand for Prestressed Concrete
According to ASTM A 416

		Diameter		Area		Weight		Breaking Strength		Min. Load at 1% Extension (1)		Min. Elongation to Fracture	Relaxation 1,000 h		Min. Difference between center & outer wire
													70% CR	80% CR
		in	mm	in^2	mm^2	lb/1000ft	kg/1000m	lbf	KN	lbf	KN	%	%	%	in	mm
Grade 250		3/8	9.53	0.080	51.61	272	405	20,000	89.0	18,000	80.1	3.5	2.5	3.5	0.002	0.0508
		7/16	11.11	0.108	69.68	367	548	27,000	120.1	24,300	108.1	3.5	2.5	3.5	0.0025	0.0635
		1/2	12.70	0.144	92.90	490	730	36,000	160.1	32,400	144.1	3.5	2.5	3.5	0.003	0.0762
		0.6	15.24	0.216	139.35	737	1,094	54,000	240.2	48,600	216.2	3.5	2.5	3.5	0.004	0.1016
Grade 270		3/8	9.53	0.085	54.84	290	432	23,000	102.3	20,700	92.1	3.5	2.5	3.5	0.002	0.0508
		7/16	11.11	0.115	74.19	390	582	31,000	137.9	27,900	124.1	3.5	2.5	3.5	0.0025	0.0635
		1/2	12.70	0.153	98.71	520	775	41,300	183.7	37,170	165.3	3.5	2.5	3.5	0.003	0.0762
		0.6	15.24	0.217	140.00	740	1,102	58,600	260.7	52,740	234.6	3.5	2.5	3.5	0.004	0.1016
SPECIAL	STD	9/16	14.28	0.191	123.44	651	989	51,700	229.8	46,530	206.8	3.5	2.5	3.5	0.0035	0.0889
	SUPER	1/2	12.70	0.162	104.3	550	819	45,000	200	40,500	180.0	3.5	2.5	3.5	0.0030	0.0762
		9/16	14.28	0.194	125.1	660	982	54,000	240	48,600	216.0	3.5	2.5	3.5	0.0035	0.0889

(1) Calculated as 90% Breaking Strength