470+

Customers
Served

500,000+

Parts
Manufactured

20+

Countries
Shipped

520+

Manufacturing
Partners

Properties of Alloy Steel 4140


Ultimate tensile strength (MPa) 355-370
Yield strength (MPa) 230
Young's modulus (modulus of elasticity) (GPa) 208-216
Elongation at break(%) 18-26
Fatigue Strength (MPa) 200-300
Hardness (Brinell) 302 HB
Density (g/cm³) 7.85
Corrosion resistance Moderate


Weldability Excellent
Maximum service temperature(°C) 613-650
Thermal expansion coefficent (10-6/ºC) 11.5-13.5
Thermal conductivity (W/(m⋅°C)) 42-48
Electrical resistivity (μΩ.cm) 20-25
Post-Processing Annealing, Tempering
Magnetism Semi-magnetic
Common applications Gears, Axles, Spindles

Available Finishes

alloy-steel-4140-surface-finish-services-clarwe

Clarwe provides a wide range ofsurface finishes through its alloy steelCNC machining service, designed to elevate the quality of each machined component. Each finish is specifically chosen to improve both the mechanical characteristics and the visual appeal of thealloy steel parts.

Industries specialized

Custom aerospace parts manufacturing services by Clarwe for high-precision and critical components

Aerospace

AS9100-certified flight-critical parts: CNC machining, sheet metal & tubing for turbines, mounts & actuators

Custom automotive parts manufacturing services by Clarwe for prototyping and low-volume production

Automotive

IATF 16945-compliant EV, drivetrain & sensor solutions: CNC, injection molding & urethane casting

Industrial parts manufacturing services by Clarwe for custom equipment, machinery, and low-volume production

Consumer Products

Scale from 1 to 1M+ consumer product units with full QA ownership and compliance

Medical parts manufacturing by Clarwe for custom healthcare components and precision prototyping

Medical

ISO 13485-certified surgical tools & implants: Precision CNC, cleanroom molding & biocompatible casting




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