- Home Page /
- Industrial Supplies /
- Raw Materials /
- Metals & Alloys /
- Steel /
- Rods /
- 4140 Alloy Steel Round Bar, Unpolished (Mill)...
0 ratings
Item #:
99843812
4140 Alloy Steel Round Bar, Unpolished (Mill) Finish, Annealed, Cold Finish, ASTM A108, 2" Diameter, 48" Length, OnlineMetals
89% of respondents would recommend this to a friend
Item #:
99843812
KYD 467
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
0 ratings
Write a review
In stock
Imported from USA store
QTY:
Order now and get it around Tuesday, October 06
Secured transaction
Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.
Our Top Logistics Partners
4140 alloy steel is known for strength, resistance to fracturing, abrasion, and impact in high stress applications.
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
What Stands Out
High Strength
The 4140 alloy steel offers exceptional strength and toughness, ideal for demanding applications such as automotive and machinery, outperforming standard steel in durability and reliability.
Precision Dimensions
With a diameter of 0.875 inches and a length of 12 inches, this round bar ensures precise dimensional control, making it perfect for custom fabrication and machine tooling.
Versatile Use
This annealed, cold-finished bar is suitable for various industries, allowing for easy machining and welding, providing flexibility for engineers and manufacturers to innovate freely.
Product Details
| Brand Name | Online Metals |
| Number of Items | 1 |
| Unit Count | 4 Feet |
| Manufacturer | OnlineMetals |
| Model Number | 120558 |
| Part Number | 10587 |
| Item Thickness | 2 inches |
| Item Weight | 42.7 pounds (19.37 kg) |
| Item Shape | Round |
| Item Form | Rod |
| Material | Alloy Steel 4140/4142 |
| Grade Rating | 4140 |
| Specification Met | Astm A108 |
| Brand | Online Metals |
| Shape | Round |
Who Should Buy?
-
Machinists
Ideal for machinists needing strong, durable materials for precision machining applications in various industries.
-
Fabricators
Excellent for fabricators looking for high-strength steel bars for welding and fabrication projects.
-
Engineers
Suitable for engineers designing components requiring high wear resistance and toughness in their applications.
-
Hobbyists
May not be suitable for casual hobbyists who require lighter materials for simple crafts or projects.
Product Description
4140 Alloy Steel Round Bar, Unpolished (Mill) Finish, Annealed, Cold Finish, ASTM A108, 2" Diameter, 48" Length, OnlineMetals
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What are the main characteristics of 4140 alloy steel?
Answer: 4140 alloy steel is known for its high strength, toughness, and good fatigue resistance. It is a chromium-molybdenum steel that is ideal for applications requiring moderate to high strength and excellent wear resistance. The annealed state ensures that the steel is easy to machine while still retaining its strength properties once hardened, making it suitable for components like gears, axles, and shafts. -
Question:
What is the typical use of a 0.75" diameter 4140 round bar?
Answer: A 0.75" diameter 4140 round bar is often used in the manufacture of various components such as structural parts, fasteners, and automotive applications. Its mechanical properties make it suitable for parts that require strength and durability under heavy loads, like drill bits and valve components. Additionally, its cold finish provides improved dimensional accuracy, making it an excellent choice for precise engineering applications. -
Question:
Is the unpolished (mill) finish suitable for my application?
Answer: Yes, an unpolished (mill) finish offers a rough surface texture that can be ideal for applications where surface finish is not critical. This finish can be beneficial for maintaining strong bonding with adhesives or coatings. Moreover, for machined applications, it allows for easier surface modification, making it a popular choice among fabricators and engineers. -
Question:
Can the 4140 round bar be heat-treated?
Answer: Absolutely, 4140 alloy steel can be heat-treated to enhance its hardness and strength. Depending on the desired mechanical properties, it can be quenched and tempered to achieve different levels of hardness. This adjustability allows users to customize the steel's characteristics to meet specific performance requirements in high-stress applications. -
Question:
What are the differences between annealed and cold-finished 4140 round bars?
Answer: Annealed 4140 round bars are softened through a heat treatment process, making them easier to work with and machine. Cold-finished 4140, on the other hand, undergoes additional processing after initial shaping, resulting in improved surface finish and tighter tolerances. This makes cold-finished bars a better choice for precision applications, whereas annealed bars are excellent for forming and shaping operations. -
Question:
How do I know if 4140 alloy steel is the right choice for my project?
Answer: Choosing 4140 alloy steel depends on your project's requirements. If you need high strength, wear resistance, and toughness in extreme conditions, 4140 is an optimal choice. Evaluating factors like operating temperature, load conditions, and environmental exposure can help you determine its suitability. For applications such as heavy machinery, automotive parts, or tooling, 4140 often meets the necessary performance standards. -
Question:
What is ASTM A108, and why is it important for 4140 steel?
Answer: ASTM A108 is a standard specification for steel bars that undergo a cold finishing process. It guarantees certain mechanical properties and specifies allowable manufacturing variations. Compliance with ASTM A108 ensures that the 4140 steel meets industry standards for quality and performance, making it essential in sectors where precision and reliability are paramount. -
Question:
What factors affect the machinability of 4140 alloy steel?
Answer: The machinability of 4140 alloy steel is influenced by its hardness, microstructure, and the condition of the material. In its annealed state, 4140 is relatively easy to machine. However, if it has been hardened, specialized machining techniques or tools may be required. Understanding the specific alloy and finshing process can help optimize machining operations for efficiency and effectiveness. -
Question:
How do I properly store 4140 alloy steel round bars?
Answer: To ensure the longevity of 4140 alloy steel round bars, they should be stored in a dry, indoor environment to prevent rusting and corrosion. Using protective coverings can provide additional protection against moisture. Additionally, keeping the bars off the ground and secured properly can help avoid physical damage or deformation. -
Question:
Where can I buy 4140 Alloy Steel Round Bar, Unpolished (Mill) Finish, Annealed, Cold Finish, ASTM A108, 0.75" Diameter, 72" Length in Cayman Islands?
Answer: You can purchase 4140 Alloy Steel Round Bar from Ubuy in Cayman Islands. Ubuy offers a convenient online shopping experience, featuring a variety of metals and materials including this specific 4140 round bar. Their extensive catalog and user-friendly interface make it easy to find the products you need for your projects.
Online Metals Rods 120558 Editorial Review
4140 Alloy Steel Round Bar, Unpolished (Mill) Finish, Annealed, Cold Finish, ASTM A108, 2" Diameter, 48" Length, OnlineMetals is an excellent choice for metalworking projects. Crafted from high-quality alloy steel 4140, this 2-inch diameter rod is 4 feet long and weighs 42.7 pounds, making it a sturdy option for tool making and fabrication. Many users have praised its exceptional quality, noting how well it machines on lathes. While a minor shipping error was quickly addressed by the vendor, the overall consensus is that this steel rod performs well, providing reliability for various applications like creating leveling feet or enhancing stability in structures.
Customer Reviews & Ratings
1 customers ratings
-
5 Star
100%
-
4 Star
0%
-
3 Star
0%
-
2 Star
0%
-
1 Star
0%
Review this product
Share your thoughts with other customers
Pros
- High-quality alloy steel for durability
- Good machining performance on lathes
- Smooth and clean surface finish
- Perfect for tool making and fabrication
- Great for structural stability projects
Cons
- Slightly bent upon arrival, but manageable
Platform Trust & Buyer Confidence
JK
Jasmin
Verified buyer
“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
AG
Anke
Verified buyer
“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”
10 September 2026 · via Trustpilot
H
Hazel
Verified buyer
“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”
10 September 2026 · via Trustpilot
O
Opaleye
Verified buyer
“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
AC
Adele
Verified buyer
“Easy to find and order what you want on the website. Delivery is quick to the UK”
8 September 2026 · via Trustpilot
Secure Checkout
Global Delivery
Easy Returns
Genuine Products
Product Price History
Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
- Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.
KYD 467
Order now and get it around Tuesday, October 06
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Made from high-strength 4140 alloy steel for durability.
- Cold finished and annealed for optimal formability and toughness.
- Meets stringent ASTM A108 specifications for quality assurance.
- Can be heat treated for increased hardness, enhancing its applications.
- Ideal for demanding use in gears, shafts, spindles, and more.
- High resistance to wear and impact, making it perfect for heavy-duty applications.
Ubuy Assurance
Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.