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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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