Alloy Steel 4140 | 1.7225 | 42CrMo4 | EN19 | CNC machining service | Custom Alloy Steel 4140 | 1.7225 | 42CrMo4 | EN19 parts

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CNC Machining Service for Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4

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Material type

Metal
Material name

Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4
Alternative names

42CrMo4, 1.7225
Process compatibility

CNC machining

AISI 4140 is a low-alloy steel containing chromium and molybdenum, which guarantees it reasonable strength. Additionally, it demonstrates good resistance to atmospheric corrosion. Its superior properties have led to its widespread use across various industries.

Sunnyhowe

Mechanical properties

Ultimate tensile strength

355 - 370 MPa

Yield strength

230 MPa

Young's modulus (modulus of elasticity)

208 - 216 GPa

Elongation at break

18 - 26 %

Physical properties

Corrosion resistance

Moderate to Poor

Magnetism

Semi-Magnetic

UV resistance

Excellent

Weldability

Moderate

Thermal properties

Maximum service temperature

613 - 650 °C

Thermal expansion coefficent

11.5 - 13.5 10^-6/ºC

Thermal conductivity

42 - 48 W/(m⋅°C)

Electrical properties

Electrical resistivity

20 - 25 μΩ*cm

Post treatments

Post-Processing

Tempering & Annealing

Anodizing compatibility

Not suitable

Common applications

Heavy duty shafts

Connecting rods

High tensile bolts

Alloy Steel 4140 (1.7225 | 42CrMo4 | EN19) CNC Machining Applications & Parts

Alloy Steel 4140 is a versatile chromium-molybdenum medium carbon steel known for its high strength, good toughness, and excellent wear resistance. It is one of the most commonly used steels for general machining and can be heat treated to a wide range of hardness levels.

Typical Parts We Machine from Alloy Steel 4140:

General Engineering: Axles, shafts, gears, bolts, spindles
Hydraulic & Pneumatic: Cylinder barrels, piston rods, valve bodies
Tooling & Jigs: Milling machine arbors, fixtures, jigs, press tools

Our Machining Advantage:

We have extensive experience machining 4140 in all its conditions—from annealed to pre-hardened (~28-32 HRC)—using optimized parameters and tooling to ensure efficiency, precision, and excellent surface integrity.

Get an Instant Quotefor your custom Alloy Steel 4140 parts today.

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Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4

Alloy Steel 4140 (1.7225 | 42CrMo4 | EN19) CNC Machining Applications & Parts

Typical Parts We Machine from Alloy Steel 4140:

Our Machining Advantage:

Let's Machine Your Vision, Together.