4140 Steel Supplier
A Reliable Source for Quality 4140 Alloy Steel Bar
Jade Sterling Steel supplies high-quality 4140 alloy steel backed by a full range of value-added processes, helping you match mechanical performance, machinability, and finishing characteristics to your application’s exact needs.
With dependable nationwide distribution and deep inventory, we’re a trusted partner for manufacturers across automotive, aerospace, industrial machinery, defense, and construction.
About Alloy Steel 4140
4140 is a medium-carbon, low-alloy steel containing chromium and molybdenum for enhanced strength, hardenability, and wear resistance. It is widely chosen for demanding applications requiring a balance of toughness, fatigue resistance, and versatility across heat-treated conditions.
Learn more in our full 4140 Steel Properties Guide →
4140 Steel Composition
4140 steel typically contains:
0.38%–0.43% carbon
Chromium for wear and corrosion resistance
Molybdenum for high-temperature strength and hardenability
Manganese to improve strength and machinability
Key Properties of 4140 Steel
High Tensile Strength
4140 offers excellent strength characteristics, including:
~ 95,000 psi tensile strength in its annealed condition
Strong fatigue and torsional performance under repetitive loading
4140 Hardness + Machinability
In its annealed state, 4140 provides:
197 Brinell-scale hardness
Excellent wear resistance with minimal fracturing
A machinability rating above 65%
4140 Heat-Treated Options
4140 is highly responsive to heat treatment. We can tailor hardness, ductility, and toughness to the requirements of your specific application. Treatment routes include:
Quench and temper
Normalizing
Annealing
Stress relieving
This versatility makes 4140 a strong choice for components requiring both durability and precision performance.
Why Choose Jade Sterling Steel
With more than 55 years in steel distribution, Jade Sterling Steel has built a reputation for consistent quality, deep inventory, and dependable service.
Our 40,000-ton stock across grades and sizes gives manufacturers the flexibility to source 4140 steel in the dimensions and conditions they need, when they need it.
We support both just-in-time programs and long-term supply arrangements, helping customers maintain continuity even when market conditions shift.
We serve manufacturers across critical industries where 4140’s strength and durability are essential, including components like:
Automotive: shafts, gears, axles
Aerospace: landing gear, structural parts
Industrial & construction: bolts, chains, fasteners
Defense: gun barrels and other high-stress components
4140 Steel Prices and Availability
Pricing for 4140 steel varies by market conditions, bar size, finishing requirements, and heat-treating needs.
Jade Sterling Steel provides transparent quotes and reliable nationwide supply to support both routine and urgent demand.