# 4140 Alloy Steel Parts | Chromium-Molybdenum Steel > 4140 alloy steel parts with high strength and toughness. Chromium-molybdenum steel components for demanding applications. Fast delivery from China factory. Get instant quote! https://www.sinbo-machining.com/products/materials/steel/4140-alloy-steel-parts/ --- ## On This Page - Quick Specifications - Product Overview - Technical Specifications - 4140 Steel Properties - High Strength - High Toughness - Wear Resistance - Excellent Heat Treatability - Good Machinability - Weldable - Industrial Applications - Oil and Gas - Automotive - Heavy Machinery - Aerospace - Tooling - Construction - Why Choose Sinbo Precision - Certifications - Frequently Asked Questions - What is the minimum order quantity? - What is the typical lead time? - What file formats do you accept? - Do you provide heat treatment services? - Can 4140 steel be welded? - Do you provide design for manufacturing (DFM) support? - Related Products - 1045 Steel Precision Components - 1018 Steel CNC Machined Parts - 300M Ultra-High Strength Steel - Heat Treated Steel Components - Manufacturing Capabilities - Quality Assurance - Ready to Get Started? [4140 Alloy Steel Parts - Chromium-Molybdenum Steel Components] [4140 Alloy Steel Parts Detail View] [4140 Alloy Steel Parts Application] [4140 Alloy Steel Parts Dimensions] [4140 Alloy Steel Parts Close-up] # 4140 Alloy Steel Parts ## Quick Specifications Material 4140 Alloy Steel Process CNC Machining Tolerance ±0.005mm Lead Time 10-15 days MOQ 10 pieces Surface Finish Polished, Black Oxide [Get Instant Quote ](https://www.sinbo-machining.com/quote/)[Contact Us ](https://www.sinbo-machining.com/contact/) ## Product Overview Sinbo Precision specializes in manufacturing 4140 alloy steel parts, offering high-quality chromium-molybdenum steel components for demanding industrial applications. 4140 steel is a versatile alloy steel containing chromium and molybdenum as strengthening agents, providing excellent strength, toughness, and wear resistance. It is widely used in applications requiring high mechanical properties and good fatigue strength. Our advanced CNC machining capabilities enable us to produce 4140 steel parts with tight tolerances of ±0.005mm and excellent surface finishes. 4140 steel responds exceptionally well to heat treatment, allowing us to achieve various hardness levels through quenching and tempering processes. We offer comprehensive surface treatment options including polishing, black oxide coating, and various plating options to enhance corrosion resistance and performance in harsh environments. We provide complete manufacturing solutions from prototype development through high-volume production. Our engineering team offers expert DFM (Design for Manufacturing) support to optimize your designs for 4140 steel machining, ensuring cost-effective production while meeting stringent quality requirements. With our China factory and efficient logistics, we can deliver your precision components quickly and reliably. ## Technical Specifications | Material Grade | 4140 Alloy Steel (AISI 4140, UNS G41400) | Process | CNC Milling, CNC Turning, 5-Axis Machining | Tolerance | ±0.005mm (±0.0002") | Surface Finish | Polished (Ra 1.6), Black Oxide, Zinc Plated | Size Range | Up to 500mm diameter | Lead Time | 10-15 days (standard), 7-10 days (express) | MOQ | 10 pieces (prototypes), 100 pieces (production) | Certifications | ISO 9001, IATF 16949, ISO 14001 ## 4140 Steel Properties ### High Strength 4140 steel offers exceptional tensile and yield strength. Tensile strength up to 950 MPa in heat-treated condition. - • Very high tensile strength - • Excellent yield strength - • Superior mechanical properties ### High Toughness Provides excellent impact resistance and toughness even at elevated temperatures. Ideal for high-stress applications. - • Excellent impact resistance - • Good fatigue strength - • High toughness ### Wear Resistance Good wear resistance and durability. Can be hardened to achieve various surface hardness levels. - • Good wear resistance - • Durable performance - • Hardenable ### Excellent Heat Treatability Responds exceptionally well to heat treatment. Can achieve wide range of hardness levels through quenching and tempering. - • Deep hardening - • Wide hardness range - • Uniform properties ### Good Machinability Reasonable machinability rating of 60% of B1112 in annealed condition. Can be machined efficiently with proper tooling. - • Annealed machinability - • Compatible tooling - • Efficient machining ### Weldable Can be welded using proper procedures. Pre-heating and post-weld heat treatment are essential for optimal weld quality. - • Proper welding procedures - • Pre-heating required - • Post-weld treatment ## Industrial Applications ### Oil and Gas Drill collars, valve components, and oil field equipment requiring high strength and corrosion resistance ### Automotive Crankshafts, axle shafts, gears, and high-stress automotive components ### Heavy Machinery Heavy equipment components, structural parts, and machinery shafts ### Aerospace Landing gear components, structural parts, and high-stress aerospace applications ### Tooling High-strength tooling, dies, molds, and precision tooling components ### Construction Heavy construction equipment, structural components, and construction machinery parts ## Why Choose Sinbo Precision 20+ Years Experience ±0.005mm Precision Tolerance 10-15 Days Lead Time 100% Quality Guarantee ## Certifications [ISO 9001:2015 Certification] ISO 9001:2015 [IATF 16949:2016 Certification] IATF 16949:2016 [ISO 14001:2015 Certification] ISO 14001:2015 ## Frequently Asked Questions ### What is the minimum order quantity? Our minimum order quantity is 10 pieces for prototypes and 100 pieces for production runs. We can accommodate lower quantities for development projects with appropriate setup considerations. ### What is the typical lead time? Standard lead time is 10-15 days depending on complexity and quantity. Express delivery options are available for urgent requirements with 7-10 day turnaround. ### What file formats do you accept? We accept STEP, IGES, STL, DXF, DWG, and PDF files. Our engineering team can work with various CAD formats to ensure accurate manufacturing. ### Do you provide heat treatment services? Yes, we provide comprehensive heat treatment services including quenching, tempering, induction hardening, and flame hardening to achieve required hardness levels for 4140 steel components. ### Can 4140 steel be welded? Yes, 4140 steel can be welded using proper procedures. Due to its alloy content, pre-heating and post-weld heat treatment are essential to prevent cracking and ensure optimal weld quality. ### Do you provide design for manufacturing (DFM) support? Yes, our engineering team provides free DFM analysis and suggestions to optimize your design for 4140 steel machining, ensuring cost-effective production while maintaining quality requirements. ## Related Products [1045 Steel Precision Components] ### 1045 Steel Precision Components Medium carbon steel with high strength [Learn More → ](1045-steel-precision-components) [1018 Steel CNC Machined Parts] ### 1018 Steel CNC Machined Parts Low carbon steel with excellent machinability [Learn More → ](1018-steel-cnc-machined-parts) [300M Ultra-High Strength Steel] ### 300M Ultra-High Strength Steel Aircraft landing gear components [Learn More → ](300m-ultra-high-strength-steel) [Heat Treated Steel Components] ### Heat Treated Steel Components Heat treated steel with enhanced properties [Learn More → ](heat-treated-steel-components) ## Manufacturing Capabilities 50+ CNC Machines ±0.005mm Precision Tolerance 3-5 Days Delivery 15+ Years Experience ## Quality Assurance [ISO 9001:2015 Certification] ISO 9001:2015 [IATF 16949:2016 Certification] IATF 16949:2016 [ISO 14001:2015 Certification] ISO 14001:2015 [SA 8000:2014 Certification] SA 8000:2014 ## Ready to Get Started? Get a free quote within 24 hours. No minimum order quantity required. [Get Instant Quote ](https://www.sinbo-machining.com/quote/)[Contact Us ](https://www.sinbo-machining.com/contact/)