Grade.
mm
|
Nominal Dia.
in |
Nominal Steel Area
sq-in2 (mm2) |
Nominal Weight
1bf per 1,000ft (kg/1,000m) |
Min. Breaking Strength 1bf
kN |
Min. Load at 1% Extension 1bf
kN |
Min Elon-gation at Max. Load
% |
Max,% Relaxation After 1,000hrs From |
| 70% Initial Load |
80% Initial Load | |
|
Grade 250 |
1/4(0.250) |
0.036(23.22) |
122(182) |
9,000 |
8,100 |
3.5 |
2.5 |
3.5 |
| 40.0 |
36.0 |
| 5/16(0.313) |
0.058(37.42) |
197(294) |
14,500 |
13,050 |
3.5 |
2.5 |
3.5 |
| 64.5 |
58.1 |
| 3/8(0.375) |
0.080(51.61) |
272(405) |
20,000 |
18,000 |
3.5 |
2.5 |
3.5 |
| 89.0 |
80.1 |
| 7/16(0.438) |
0.108(69.68) |
367(548) |
27,000 |
24,300 |
3.5 |
2.5 |
3.5 |
| 120.1 |
108.1 |
| 1/2(0.500) |
0.144(92.90) |
490(730) |
36,000 |
32,400 |
3.5 |
2.5 |
3.5 |
| 160.1 |
144.1 |
| (0.600) |
0.216(139.35) |
735(1094) |
54,000 |
48,600 |
3.5 |
2.5 |
3.5 |
| 240.2 |
216.1 |
Grade 270 |
3/8(0.375) |
0.086(54.84) |
290(432) |
23,000 |
20,700 |
3.5 |
2.5 |
3.5 |
| 102.3 |
92.1 |
| 7/16(0.438) |
0.105(74.19) |
390(582) |
31,000 |
27,900 |
3.5 |
2.5 |
3.5 |
| 137.9 |
124.1 |
| 1/2(0.500) |
0.153(98.71) |
520(775) |
41,000 |
37,170 |
3.5 |
2.5 |
3.5 |
| 183.7 |
165.3 |
| (0.600) |
0.217(140.00) |
740(1102) |
58,600 |
52,740 |
3.5 |
2.5 |
3.5 |
| 260.7 |
234.6 | | |