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ASTM A325

ASTM A325/A325M Bolts Specification

Carbon Steel, Alloy Steel And Weatherng Steel Structural Bolts, Hex Cap Screws and Studs Heat Treated to 120/105 ksi Minimum Tensile Strength

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Recommended Nuts

Bolt Type and FinishNut Class and Finish
1, plain (noncoated)A563-C, C3, D, DH, DH3, plain
1, zinc coatedA563-DH, zinc coated
1, coated in accordance with Specification F1136, Grade 3A563-DH coated in accordance with Specification F1136, Grade 5
3, plainA563-C3, DH3, plain

Recommended Washers

Bolt Type and FinishWasher Finish
1, plain (uncoated)plain (uncoated)
1, zinc coatedzinc coated
1, coated in accordance with Specification F1136, Grade 3coated in accordance with Specification F1136, Grade 3
3, plainweathering steel, plain

Chemical Requirements

ASTM A325/A325M Chemical Requirements for Type 1 Bolts

ElementCMn, minP, maxS, maxSiBAlloying Elements
Carbon SteelHeat analysis0.30-0.520.60.040.050.15-0.30. . .. . .
Product analysis0.28-0.550.570.0480.0580.13-0.32. . .. . .
Carbon Boron SteelHeat analysis0.30-0.520.60.040.050.10-0.300.0005-0.003. . .
Product analysis0.28-0.550.570.0480.0580.08-0.320.0005-0.003. . .
Alloy SteelHeat analysis0.30-0.520.60.040.050.15-0.35. . .A
Product analysis0.28-0.550.570.0480.0580.13-0.37. . .A
Alloy Boron SteelHeat analysis0.30-0.520.60.040.050.15-0.350.0005-0.003A
Product analysis0.28-0.550.570.0480.0580.13-0.370.0005-0.003A

ASTM A325/A325M Chemical Requirements for Type 3 Heavy Hex Structural BoltsA

Mechanical Requirements

ASTM A325/A325M Hardness Requirements for Bolts

Size, in.Nominal Length, in.BrinellRockwell C
minmaxminmax
1⁄2 to 1, incl.Less than 2D 2D and longer2533192534
…319…34
Over 1 to 1 1⁄2, inclLess than 3D 3D and longer2232861930
…286…30

ASTM A325/A325M Tensile Load Requirements for Bolts Tested Full-Size

Bolt Size, Threads per Inch, and Series DesignationStress Area,A in.2Tensile Load,B lbf minProof Load,Length Measurement MethodAlternative Proof Load,B lbf Yield Strength Method
1⁄2 -13 UNC0.14217 05012 05013 050
5⁄8-11 UNC0.22627 10019 20020 800
3⁄4-10 UNC0.33440 10028 40030 700
7⁄8-9 UNC0.46255 45039 25042 500
1-8 UNC0.60672 70051 50055 750
1 1⁄8-7 UNC0.76380 10056 45061 800
1 1⁄4-7 UNC0.969101 70071 70078 500
1 3⁄8-6 UNC1.155121 30085 45093 550
1 1⁄2-6 UNC1.405147 500104 000113 800
    • A The stress area is calculated as follows
      • As = 0.7854 [D – (0.9743/n)]2
    • where:
      • As = stress area, in.2
      • D = nominal bolt size, and
      • n = threads per inch.
    • B Loads tabulated are based on the following:
Bolt Size, in.Tensile Load,B lbf minProof Load,Length Measurement MethodAlternative Proof Load,B lbf Yield Strength Method
1⁄2 to 1, incl120 000 psi85 000 psi92 000 psi
1 1⁄8 to 1 1⁄2, inc105 000 psi74 000 psi81 000 psi

ASTM A325/A325M Tensile Strength Requirements for Specimens Machined from Bolts

Bolt Diameter, in.Tensile Strength, min, psi (MPa)Yield Strength, min, psi (MPa)Elongation, in 4D, min, %Reduction of Area, min, %
1⁄2 to 1, incl.120 000 (825)92 000 (635)1435
Over 1 to 11⁄2105 000 (725)81 000 (560)1435

ASTM A325/A325M Rotational Capacity Test for Zinc-Coated Bolts

Up to and including 4 × dia240 (2⁄3 )
Over 4 × dia, but not exceeding 8 × dia360 (1)
Over 8 × dia, but not exceeding 12 × dia420 (11⁄6)
Over 12 × dia.Test not applicable

Dimensions

Nominal Bolt Diameter (in.)Oversize Limit, in.A
Hot-Dip ZincMechanical Zinc
1⁄20.0180.012
9⁄16 , 5⁄8, 3⁄40.020.013
7⁄80.0220.015
1 to 1 1⁄40.0240.016
1 3⁄8 , 1 1⁄20.0270.018

Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark Adfast Component LTD along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Certification

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

Supplementary Requirements

S1.Bolts Threaded Full Length