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Standard Specification for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions
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: 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.
ASTM F3125 Bolt Types
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 |
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ASTM F3125 Chemical Composition
Heat Analysis | 120ksi Type 1, % | 150ksi Type 1, % | 150ksi Type 3, % |
Carbon | 0.30 – 0.52 | 0.30 – 0.48 | 0.30 – 0.53 |
Manganese | 0.60 min | 0.60 min | 0.60 min |
Phosphorus | 0.035 max | 0.035 max | 0.035 |
Sulfur | 0.040 max | 0.040 max | 0.040 |
Silicon | 0.15 – 0.30 | - | |
Boron | 0.003 max | 0.003 max | |
Copper | - | - | 0.20 – 0.60 |
Nickel | - | - | 0.20* min |
Chromium | - | - | 0.45 min |
Molybdenum | - | - | 0.10* min |
ASTM F3125 Mechanical Properties
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 |
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Tarq Bolt is a leading manufacturer and exporter of ASTM F3125 fastenrs in India. Our inventory includes astm a182 gr. f51 duplex steel fasteners in many grades including 12 point nuts DIN 934, ISO 4033, ISO 4032, DIN 935,DIN 936, ASME B18.2.2, ASME B18.2.4.6M nuts, threaded rod/bar, studs, double end studs, tap end studs DIN 976, DIN 975, DIN 2510, DIN 939, DIN 940, DIN 938 studbolts are readily available in all standard sizes and schedules.