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
Material
4140 Alloy Steel
Process
CNC Machining
Tolerance
±0.005mm
Lead Time
10-15 days
MOQ
10 pieces
Surface Finish
Polished, Black Oxide
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 USA warehouse and efficient logistics, we can deliver your precision components quickly and reliably.
| 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 offers exceptional tensile and yield strength. Tensile strength up to 950 MPa in heat-treated condition.
Provides excellent impact resistance and toughness even at elevated temperatures. Ideal for high-stress applications.
Good wear resistance and durability. Can be hardened to achieve various surface hardness levels.
Responds exceptionally well to heat treatment. Can achieve wide range of hardness levels through quenching and tempering.
Reasonable machinability rating of 60% of B1112 in annealed condition. Can be machined efficiently with proper tooling.
Can be welded using proper procedures. Pre-heating and post-weld heat treatment are essential for optimal weld quality.
Drill collars, valve components, and oil field equipment requiring high strength and corrosion resistance
Crankshafts, axle shafts, gears, and high-stress automotive components
Heavy equipment components, structural parts, and machinery shafts
Landing gear components, structural parts, and high-stress aerospace applications
High-strength tooling, dies, molds, and precision tooling components
Heavy construction equipment, structural components, and construction machinery parts
Years Experience
Precision Tolerance
Days Lead Time
Quality Guarantee
ISO 9001:2015
IATF 16949:2016
ISO 14001:2015
OHSAS 18001:2007
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.
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.
We accept STEP, IGES, STL, DXF, DWG, and PDF files. Our engineering team can work with various CAD formats to ensure accurate manufacturing.
Yes, we provide comprehensive heat treatment services including quenching, tempering, induction hardening, and flame hardening to achieve required hardness levels for 4140 steel components.
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.
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.
CNC Machines
Precision Tolerance
Days Delivery
Years Experience
ISO 9001:2015
IATF 16949:2016
ISO 14001:2015
SA 8000:2014
Get a free quote within 24 hours. No minimum order quantity required.