General Information about 4140 Round Bar and 4140 Steel Bar

4140 round bar is an alloy steel that contains measurable amounts of carbon, molybdenum, silicon, phosphorus, sulfur, chromium and manganese. These elements are added in order to achieve specific properties.

4140 round bar may be supplied in an annealed or prehardened condition. The carbon content helps to make the steel capable of being heat treated. The chromium, manganese and molybdenum add toughness and strength.

4140 Round Bar

4140 Round Bar

By normalizing 4140 round bar, it helps to remove stress within the steel. By annealing 4140 steel bar, it makes the material softer and easier to machine. 4140 round bar may be supplied as hot rolled, cold drawn, rough turned or turned and polished. A typical length for 4140 round bar is 20′, although many mills have the capacity to roll a variety of lengths depending on the diameter and application. It is also available in a wide range of diameters.

Applications

4140 steel bar responds well to heat treatment, is relatively easy to machine in the annealed condition, and is used in a wide variety of machined parts. With its moderately simple composition, strength and toughness, 4140 steel bar is used in a variety of machined applications such as gears, bolts and fasteners.

Composition

4140 steel bar consists of carbon, .37/.43, manganese, .75/1.00, phosphorus, .035 (max.), sulfur, .04 (max.), silicon, .15/.35, chromium, .80/1.10 and molybdenum, .15/.25. Other elements, such as phosphorous and sulfur are found in small amounts and are considered to be impurities.

The overall composition of 4140 round bar makes it difficult to machine.

Cold Drawn Bars
ShapeSize Range (mm)Size Range (mm)
Round2 to 213/32 to 13/16
Hexagon4 to 755/32 to 3
Square4 to 455/32 to 3

 

Smooth, Turned & Polished
ShapeSize Range (mm)Size Range (mm)
Round22 to 10013 / 16 to 4

 

Centerless Ground
ShapeSize Range (mm)Size Range (mm)
Round22 to 10013 / 16 to 4

 

Centerless Ground & Polished
ShapeSize Range (mm)Size Range (mm)
Round22 to 10013 / 16 to 4

 

Pump Shaft quality
ShapeSize Range (mm)Size Range (mm)
Round22 to 15013 / 16 to 6

 

Forged Rough Turned
ShapeSize Range (mm)Size Range (mm)
Round155 to 4006 1/4 to 16

Our products are widely exported to countries and regions such as the United States, Europe, Russia, Turkey, Malaysia, the UAE, Saudi Arabia,
Iran, Brazil, Chile, Mexico, South Africa, Jordan, Tunisia, Vietnam, Indonesia, Thailand, Singapore, Colombia, and Sri Lanka.

C360 Brass Hex Bar

C360 Brass Hex Bar

C360 Brass Hex Bar, Standard Tolerance Hexagon Brass Rod, Unpolished (Mill) Finish Brass Bar Hexagon, Hexagonal Brass Mill Rod, Brass Half Hard Hex Bar, C360 Naval Hex Brass Bar, Hexagonal Brass Rod China Factory C360 Brass Hex Bar Product features 360 brass, also known as free-machining brass, provides corrosion resistance and better machinability than 353 […]

Standard Tolerance Hexagon Brass Rod

Standard Tolerance Hexagon Brass Rod

Standard Tolerance Hexagon Brass Rod, Unpolished (Mill) Finish Brass Bar Hexagon, Hexagonal Brass Mill Rod, Brass Half Hard Hex Bar, C360 Brass Hex Rods, Naval Hex Brass Bar, Hexagonal Brass Rod China Factory Standard Tolerance Hexagon Brass Rod Product features 464 brass, also known as naval brass, has high corrosion resistance, especially to salt water, […]

Brass Half Hard Hex Rods

Brass Half Hard Hex Rods

Brass Half Hard Hex Rods, Unpolished (Mill) Finish Brass Bar Hexagon, Hexagonal Brass Mill Rod, Brass Half Hard Hex Bar, C360 Brass Hex Rods, Free Cutting or Free Machining Hex Brass Bar, Hexagonal Brass Rod China Factory Brass Half Hard Hex Rods are available with us in a wide range of shapes and material grades. […]