The specification of ASTM F3125 comprises the mechanical, chemical, and physical necessities for the structural bolts. They are produced from alloy steel and stainless steel in two styles, grades, and types. It is a replacement and
consolidation for 6 ASTM standards, A325, A490, F1852, A325M, F2280, and A490M, varying from 1/2″ through 1-1/2″ diameter. The primary difference between the current and the old standards is A325s with 1-1/8” to 1-1/2” diameter,
including similar mechanical requirements like A325s 1” and under. The previous giant bolts have lower standards.
Below we have mentioned the grades that fall under F3125
F3125 Bolt Types
| Grade |
Type |
Tensile ksi, min |
Yield ksi, min |
| A490 |
1 or 3 |
150-173 |
Heavy Hex Head |
| A490M |
1 or 3 |
1040 Mpa |
Heavy Hex Head |
Type 1 – 120ksi - carbon, carbon boron, alloy, or alloy boron steel
Type 1 – 150ksi – alloy or alloy boron steel
Type 3 – weathering Steel |
F3125 Mechanical properties
| Grade |
Tensile ksi, min |
Yield ksi, min |
Elong %, min |
RA % min |
| 120 ksi (A325/F1852) |
120 |
92 |
14 |
35 |
| 150 ksi (A490/F2280) |
150-173 |
130 |
14 |
40 |
F3125 Chemical properties Type 1
| Element |
120ksi, % |
150ksi, % |
| Carbon |
0.30 – 0.52% |
0.30 – 0.48% |
| Manganese |
0.60 min |
0.60 min |
| Phosphorus, max |
0.035 max |
0.035 max |
| Sulfur, max |
0.040 max |
0.040 max |
| Silicon |
0.15 – 0.30% |
- |
| Chromium |
- |
- |
| Nickel |
- |
- |
| Boron |
0.003 max |
0.003 max |
| Molybdenum |
- |
- |
F3125 Chemical properties Type 3
| Element |
120ksi, % Comp A |
120ksi, % Comp A |
120ksi, % Index |
150ksi, % Index |
| Carbon |
0.33 – 0.40% |
0.38 – 0.48% |
0.30 – 0.52% |
0.30 – 0.48% |
| Manganese |
0.90 - 1.20 |
0.70 - 0.90 |
0.60 min |
0.60 min |
| Phosphorus, max |
0.035 max |
0.035 max |
0.035 max |
0.035 max |
| Sulfur, max |
0.040 max |
0.040 max |
0.040 max |
0.040 max |
| Silicon |
0.15 – 0.30% |
0.30 - 0.50% |
- |
- |
| Copper |
0.25 - 0.45% |
0.20 - 0.40% |
0.20 - 0.60% |
0.20 - 0.60% |
| Nickel |
0.25 - 0.45% |
0.50 - 0.80% |
0.20 min |
0.20 min |
| Chromium |
0.45 - 0.65% |
0.50 - 0.80% |
0.20 min |
0.20 min |
| Molybdenum |
- |
0.06 max |
0.10 min |
0.10 min |
F3125 Marking Requirements & Matching Components
|
120ksi, Type 1 |
120ksi, Type 3 |
150ksi, Type 1 |
150ksi, Type 3 |
| Marking |
A325 |
A325 |
A490 |
A490 |
| Nut, Plain |
A563 DH |
A563 DH3 |
A563 DH |
A563 DH3 |
| Nut, Coated |
A563 DH |
A563 DH3 |
A563 DH |
A563 DH3 |
| Washer |
F436-1 |
F436-3 |
F436-1 |
F436-3 |
F3125 Permitted Coatings
| Bolt |
F2329 hot dip galvanizing |
B695 mechanical galvanizing |
F1136 Zinc/ Aluminium (Geomet) |
F2833 Zinc/ Aluminium |
| A490 |
Not Approved |
Not Approved |
Grade 3 |
Grade 1 |
