ASTM A325 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022

In this post I'll talk about and give details about ASTM A325. First let's describe it and then have a look at its material's properties.

What is ASTM A325?

ASTM A325 is a Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength.


Steel Bolting Materials


This specification covers two types of quenched and tempered steel heavy hex structural bolts having a minimum tensile strength of 120 ksi for sizes 1.0 in. and less and 105 ksi for sizes over 1.0 to 11⁄2 in., inclusive.

Ok let's start with ASTM A325 chemical composition.

Chemical Composition

Type 1


0.30 - 0.52

Mn min.


P max.


S max.



0.15 - 0.30

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

1/2 to 1 in.

92 ksi (635 MPa) min.

Learn more about what is yield strength.

Tensile Strength

1/2 to 1 in.

120 ksi (825 MPa) min.

Learn more about what is tensile strength.

Elongation (min.) 4D


Learn more about what is elongation.

Reduction of Area (min. %)


Learn more about reduction of area.

Hardness Requirements

Type 1, depending on the diameter

253 - 319 HB or 25 - 34 HRC

Learn more about what is hardness.


7800 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).

Learn more about density.

Elastic Modulus

190 GPa (27557 ksi) - 210GPa (30458 ksi).

Learn more about the Elastic Modulus.

Poisson's Ratio

0.27 – 0.30.

Learn more about the poisson ratio.

Allowable Stress

Depends on the project (And its factor of safety).

Learn more about the what is allowable stress.

My Material's Rank

While engineers will often look for the cheapest material they can use, I took a different approach to material's selection to help newbie students.

I ranked materials according to their yield strengths and ASTM A325 currently ranks 13 in my yield strength index. This means there are other 12 materials that are more resistant.

Note: I've analysed 134 materials in order to create an yield strength index. Check my astm material's comparison post for more details.

ASTM Classroom

Are you having trouble understanding the basics of ASTM?

What is the difference between Code, Standard & Specification?

This video will walk you through:



When you need to include a fact or piece of information in an assignment or essay you should also include where and how you found that piece of information.

That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy & paste the information below into your assignment or essay:

Luz, Gelson. ASTM A325 Properties (Chem., Mech. & Rankings). Materials Blog. dd mmmm. yyyy. <URL>

Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page (The < and > stay, ok?). This citation format is based on MLA.

Other References

A194/A194M Specification for Carbon and Alloy Steel Nuts⁣
for Bolts for High Pressure or High Temperature Service,⁣
or Both⁣
A325M Specification for Structural Bolts, Steel, Heat⁣
Treated 830 MPa Minimum Tensile Strength (Metric)⁣
A449 Specification for Hex Cap Screws, Bolts and Studs,⁣
Steel, Heat Treated, 120/105/90 ksi Minimum Tensile⁣
Strength, General Use⁣
A490 Specification for Structural Bolts, Alloy Steel, Heat⁣
Treated, 150 ksi Minimum Tensile Strength⁣
A563 Specification for Carbon and Alloy Steel Nuts⁣
A751 Test Methods, Practices, and Terminology for Chemical⁣
Analysis of Steel Products⁣
B695 Specification for Coatings of Zinc Mechanically Deposited⁣
on Iron and Steel⁣
D3951 Practice for Commercial Packaging⁣
F436 Specification for Hardened Steel Washers⁣



Materials: ASTM A325 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022
ASTM A325 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022
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