ASTM A29 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022

In this post I'll talk about and give details about ASTM A29. First let's describe it and then have a look at its material's properties.

What is ASTM A29?

ASTM A29 is a Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for 121 tion for Steel Rivets and Bars for Rivets, Pressure Vessels.


Steel Bars


This specification covers a group of common requirements which, unless otherwise specified in the purchase order or in an individual specification, shall apply to carbon and alloy steel bars.

Ok let's start with ASTM A29 chemical composition.

Chemical Composition

Grade 4140


0.38 - 0.43


0.75 - 1.00

P max.


S max.



0.15 - 0.35


0.80 - 1.1


0.15 - 0.25

Learn more about chemical composition.

Now it's the mechanical properties turn:

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 A29 currently ranks 146 in my yield strength index. This means there are other 145 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 A29 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

Steel Bars, Carbon, Quenched and Tempered A 321⁣
Steel Bars and Shapes, Carbon Rolled from “T”⁣
Rails A 499⁣
Steel Bars, Carbon, Merchant Quality, M-Grades A 575⁣
Steel Bars, Carbon, Hot-Wrought, Special⁣
Quality A 576⁣
Steel Bars, Carbon, Merchant Quality, Mechanical⁣
Properties A 663/A 663M⁣
Steel Bars, Carbon, Hot-Wrought, Special Quality,⁣
Mechanical Properties A 675/A 675M⁣
Steel Bars for Springs, Carbon and Alloy A 689⁣
Cold-Finished Carbon Steel Bars:⁣
Steel Bars, Carbon and Alloy, Cold-Finished A 108⁣
Cold-Drawn Stress-Relieved Carbon Steel Bars⁣
Subject to Mechanical Property Requirements A 311/A 311M⁣
Hot-Rolled Alloy Steel Bars:⁣
Steel Bars, Alloy, Standard Grades A 322⁣
Carbon and Alloy Steel Bars Subject to End-⁣
Quench Hardenability Requirements A 304⁣
Steel Bars, Alloy, Hot-Wrought or Cold-Finished,⁣
Quenched and Tempered A 434⁣
Steel Bars, Alloy, Hot-Wrought, for Elevated⁣
Temperature or Pressure-Containing Parts, or⁣
Both A 739⁣
Cold-Finished Alloy Steel Bars:⁣
Steel Bars, Alloy, Hot-Rolled or Cold-Finished,⁣
Quenched and Tempered A 434⁣



Materials: ASTM A29 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022
ASTM A29 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022
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