What is ASTM A325?ASTM A325 is a Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength.
CategorySteel Bolting Materials
ScopeThis 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.
C0.30 - 0.52
Si0.15 - 0.30
Learn more about chemical composition.
Now it's the mechanical properties turn:
1/2 to 1 in.92 ksi (635 MPa) min.
Learn more about what is yield strength.
1/2 to 1 in.120 ksi (825 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 4D0.14.
Learn more about what is elongation.
Reduction of Area (min. %)0.35.
Learn more about reduction of area.
Type 1, depending on the diameter253 - 319 HB or 25 - 34 HRC
Learn more about what is hardness.
Density7800 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).
Learn more about density.
Elastic Modulus190 GPa (27557 ksi) - 210GPa (30458 ksi).
Learn more about the Elastic Modulus.
Poisson's Ratio0.27 – 0.30.
Learn more about the poisson ratio.
Allowable StressDepends on the project (And its factor of safety).
Learn more about the what is allowable stress.
My Material's RankWhile 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 ClassroomAre you having trouble understanding the basics of ASTM?
What is the difference between Code, Standard & Specification?
This video will walk you through:
CitationWhen 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. Gelsonluz.com. 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 ReferencesA194/A194M Specification for Carbon and Alloy Steel Nuts
for Bolts for High Pressure or High Temperature Service,
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