ASTM A 325 - A 490

[ AREAS-964 ]

ASTM F 3125

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.

ASTM F3125 Grades
A325Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines
A490Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines
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

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

ASTM F3125 Chemical properties Type-1

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

ASTM F3125 Chemical propertiesType 3

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

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

ASTM F3125 Hardness Requirements of Bolts

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

ASTM F3125 Marking Requirements

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.

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