This specification covers the chemical, physical and mechanical requirements for structural bolts manufactured from steel and alloy steel, in two strength grades, two styles and two types. This specification is a consolidation of and replacement for six ASTM standards ranging from 1/2″ through 1-1/2″ diameter: A325 , A325M, A490, A490M, F1852 and F2280. The main difference between this standard and the older, existing standards is that A325s from 1-1/8” to 1-1/2” now have the same mechanical requirements as A325s 1” and under. Previously the larger bolts had slightly lower requirements.
| A325 |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
| A490 |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
|
Grade |
Min Strength, Tensile |
Type |
Style |
|
A325 |
120ksi min |
1 or 3 |
Heavy Hex Head |
|
A325M |
830MPa min |
1 or 3 |
Heavy Hex Head |
|
F1852 |
120ksi min |
1 or 3 |
Twist-Off/TC |
|
A490 |
150-173ksi |
1 or 3 |
Heavy Hex Head |
|
A490M |
1040MPa |
1 or 3 |
Heavy Hex Head |
|
F2280 |
150ksi |
1 or 3 |
Twist-Off/TC |
|
a ) Type 1 – 120ksi - carbon, carbon boron, alloy, or alloy boron steel b ) Type 1 – 150ksi – alloy or alloy boron steel c ) Type 3 – weathering Steel |
|||
|
Property class |
Chemical composition |
|||||||||
|
C. |
Mn. |
Si. |
P. |
S. |
Cr. |
Ni. |
Mo. |
V. |
B |
|
|
120ksi, % |
0.30 – 0.52 |
0.60 min |
0.15-0.30 |
0.035 max. |
0.040 max. |
- |
- |
- |
- |
0.003 max |
|
150ksi, % |
0.30-0.48 |
0.60 min |
- |
0.035 max. |
0.040 max. |
- |
- |
- |
- |
0.003 max |
|
Carbon 0.35-0.53% for 1-1/2” A490/150ksi bolts |
||||||||||
|
Property class |
Chemical composition |
|||||||||
|
C. |
Mn. |
Si. |
P. |
S. |
Cr. |
Ni. |
Mo. |
V. |
B |
|
|
120ksi, % Comp A |
0.33-0.40 |
0.90-1.20 |
0.15 - 0.30 |
0.035 max. |
0.040 max. |
0.45-0.65 |
0.25-0.45 |
- |
- |
- |
|
120ksi, % Comp B |
0.38-0.48 |
0.70-0.90 |
0.30-0.50 |
0.035 max. |
0.040 max. |
0.50-0.80 |
0.50-0.80 |
0.06 max |
- |
- |
|
120ksi, % Index |
0.30-0.52 |
0.60 min |
- |
0.035 max. |
0.040 max. |
0.20 min. |
0.20 min* |
0.10 min* |
- |
- |
|
150ksi, % Index |
0.30-0.53 |
0.60 min |
- |
0.035 max. |
0.040 max. |
0.20 min. |
0.20 min* |
0.10 min* |
- |
- |
|
Either Nickel or Molybdenum must be present in the amount specified *Corrosion Index based on ASTM Guide G101 |
||||||||||
|
Grade |
Tensile, ksi |
Yield, ksi min |
Elongation, % min |
RA, % min |
|
120ksi (A325/F1852) |
120 min |
92 |
14 |
35 |
|
150ksi (A490/F2280) |
150-173 |
130 |
14 |
40 |
|
120 ksi, Gr. - A325, A325M, F1852 |
150 ksi, Gr. –A490, A490M, F2280 |
||||||||
|
Brinell HB |
Rockewll HRC |
Brinell HB |
Rockewll HRC |
||||||
|
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
||
|
Up to 1 Inch |
Less than 2D |
253 |
319 |
25 |
34 |
311 |
352 |
33 |
38 |
|
2D and longer |
- |
319 |
- |
34 |
- |
352 |
- |
38 |
|
|
Over 1 Inch |
Less than 3D |
253 |
319 |
25 |
34 |
311 |
352 |
33 |
38 |
|
3D and longer |
- |
319 |
- |
34 |
- |
352 |
- |
38 |
|
|
Marking |
120ksi, Type 1 |
120ksi, Type 3 |
150ksi, Type 1 |
150ksi, Type 3 |
|
Bolt |
A325 |
A325 |
A490 |
A490 |
|
Nut |
A563 DH |
A563 DH3 |
A563 DH |
A563 DH3 |
| - Supplementary requirements S1 and S2 have special marking requirements. | ||||