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SAE 4140 Round Bar

SAE 4140 round bar specifications

What is an sae 4140 round bar?

This bars uses a steel alloy with chromium, molybdenum, and manganese. An sae 4140 round bar is known for its wear-and-tear resistance and ductility. It can withstand high temperatures up to 1000°f. Here, the sae indicates grades developed by the society of automotive engineers.

We are aisi 4140 round bar supplier in India, check properties and characteristics of UNS G41400 bright bar here.

What are the properties and characteristics of an UNS G41400 bright bar?

Besides exhibiting durability and strength, an UNS G41400 bright bars is highly weldable and machinable. For example, clients can procuresae 4140 circles. (more complicated shapes necessitate annealing.) A 4140 hollow bars has a high melting point of over 1400°c. It also has good tensile and yield strength (655mpa and 415mpa).


Specification of SAE 4140 round bar

Specifications Size Hardness
ASTM B473 5mm - 500mm OD 197
Finish Condition Form
Black, matt finish, bright polished, BA finish, rough turned Hot rolled, cold drawn rolled, annealed Round, square, hex, rectangualar, flat bar

Manifest Alloys specializes in supplying high-quality SAE 4140 Circles, also we are trusted firm of aisi 4140 square bar from oil and gasindustry to automotive and beyond

Which industries use sae 4140 bars?

Their most salient application is in aerospace and automotive for shafts, fixtures, collars, etc. An aisi 4140 black bars also works in the oil and gas sectors, defense, and agriculture.

Types of AISI 4140 steel bars


AISI 4140 Steel Bar

AISI 4140 Steel Bar

UNS G41400 bright bar

UNS G41400 bright bar

AISI 4140 alloy steel hollow bars

AISI 4140 alloy steel hollow bars

SAE 4140 Alloy Steel Circles

SAE 4140 Alloy Steel Circles

our sae 4140 alloy steel round bar and UNS G41400 ring is maintained through strict Rockwell hardness testing procedures

How is rockwell hardness testing used to evaluate the properties of an sae 4140 rod?

The rockwell hardness test checks materials by pressing an indenter with a load to gauge the penetration. A din 1.7225 rod has a rockwell hardness rating of 28 to 32. It falls in the c scale, I.E., 25 to 65 hrc. It implies that a uns g41400 ring is of low to medium hardness. These rods can face surface hardening up to 58hrc. You can also refer to the corresponding vickers pyramid number (600 to 650hv) for sae 4140 rings.

Chemical composition of UNS G41400 bright bar


Grade Si C Mn S Mo Cr P
4140 0.15-0.35 0.38-0.43 0.75-1.00 ≤0.04 0.15-0.25 0.8-1.1 ≤0.035
AISI 4140 Black Bar and SAE 4140 Rings are commonly used in the manufacturing of gears, bearings, and power transmission components due to their exceptional hardness and wear resistance

What makes an sae 4140 alloy steel round bar an exceptional choice for high wear and tearapplications?

Automotive applications are subjected to significant wear and tear. An sae 4140 alloy steel round bars has the requisite strength and toughness. It can deliver bending, fatigue and corrosion resistance. These characteristics stem from its hardness, toughness, and low compressive stress. The resilience of an aisi 4140 hex bars also derives from its thermal stability. Some industries perform gas nitriding to enhance the fatigue resistance of an sae 4140 alloy steel rod.

Mechanical properties of SAE 4140 forged bars


Grade Elongation Yield Strength Tensile Strength
4140 ≥12% ≥950Mpa ≥1100Mpa
Viewing the unique structure of DIN 1.7225 rod and aisi 4140 steel flat bar reveals their lightweight yet highly durable nature, making them ideal for high-pressure applications

How does the unique structure of an aisi sae 4140 alloy steel rod contribute to its properties and performance?

The structure of an aisi 4140 steel flat bars comprises more molybdenum than other grades and includes chromium. This composition lends strength and reliability at elevated temperatures. Critical applications like suspension systems and oil and gas equipment employ a AISI 4140 round bars.

Equivalent grade of AISI 4140 square bars


Grade Werkstoff nr. UNS
SAE 4140 1.7225 G41400

Heat treatment of AISI 4140 round bars


  • → Forging
  • → Hardening
  • → Annealing
  • → Tempering
  • → Normalising