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ASTM F3125

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