- 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, 1.5" Diameter, 24" Length, OnlineMetals
Item #:
99843812
XCD 296
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 Sunday, August 09
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
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
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
| Item Weight | 3 lbs (1.36 kg) |
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, 1.5" Diameter, 24" Length, OnlineMetals
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What are the key properties of the OnlineMetals 4140 Alloy Steel Round Bar?
Answer: The OnlineMetals 4140 Alloy Steel Round Bar is known for its exceptional strength and toughness, which are enhanced by the alloying elements of chromium and molybdenum. The annealed and cold finish processes contribute to its workability, making it ideal for various applications in manufacturing, fabrication, and machining. This round bar's 4140 designation meets the ASTM A108 specifications, ensuring robust performance under demanding conditions, whether you're creating structural components or high-stress machinery parts. -
Question:
What is the difference between annealed and cold finish for steel bars?
Answer: The main difference between annealed and cold finish processes is the treatment applied to the steel. Annealed steel is heated and then cooled slowly, relieving internal stresses and improving ductility. In contrast, cold finish involves cold drawing the metal, resulting in a tighter tolerance, improved surface finish, and slight increase in strength. For projects requiring precise specifications and enhanced surface quality, using annealed and cold finish bars like this one can be vital. -
Question:
What applications are suitable for the 4140 Alloy Steel Round Bar?
Answer: The 4140 Alloy Steel Round Bar is versatile and often used in a variety of applications such as construction, automotive parts, and tool-making. Its strength and fatigue resistance make it ideal for making gears, shafts, and axles. Additionally, it is preferred in heavy-duty applications where durability is essential, like in the manufacturing of heavy machinery and high-load applications. Engineers frequently choose this alloy for its excellent performance in mechanical applications. -
Question:
How does the 2-inch diameter benefit my projects?
Answer: The 2-inch diameter of the OnlineMetals 4140 Alloy Steel Round Bar provides substantial strength and rigidity, which is vital for heavy-duty applications. This size is suitable for creating load-bearing supports and connection components in structural engineering tasks. Additionally, the 2-inch round bar can be effectively machined or welded, making it a flexible option for various project needs, including custom fabrication. -
Question:
Can I machine or weld the 4140 Alloy Steel Round Bar?
Answer: Yes, machining and welding the 4140 Alloy Steel Round Bar is quite feasible due to its post-annealed state. The annealing process enhances its ductility, allowing it to be easily shaped and adjusted with standard machining techniques. When welding, however, proper preheating is recommended to avoid cracking and ensure a strong bond. Applications that involve creating custom fittings or repairing heavy machinery frequently utilize this bar for its adaptability. -
Question:
What are the benefits of unpolished mill finish on this steel bar?
Answer: An unpolished mill finish retains the raw surface texture of the steel, which can be advantageous for certain applications. This finish provides improved adhesion for coatings, paints, or other surface treatments, making it ideal for projects that require subsequent finishing. Additionally, the mill finish may reduce overall costs, as it does not undergo additional processing. Users undertaking construction or welding projects often prefer this finish for its durability. -
Question:
How does ASTM A108 standard apply to the 4140 Alloy Steel Round Bar?
Answer: The ASTM A108 standard covers the specifications for carbon and alloy steel bars that are cold finished. In the case of the 4140 Alloy Steel Round Bar, adherence to this standard means that it maintains strict tolerances and is suitable for most engineering applications requiring high-quality steel. By choosing a product with ASTM A108 compliance, users can ensure that they receive consistent material quality, which is essential for precision engineering. -
Question:
What should I consider when storing the 4140 Alloy Steel Round Bar?
Answer: When storing the 4140 Alloy Steel Round Bar, it’s crucial to keep it in a dry environment to prevent rust and corrosion. Ideally, it should be stored off the ground on pallets or racks to avoid contact with any moisture. Proper inventory management also entails ensuring that the bar is secured and labeled accurately for easy access in future use, especially in workshops or manufacturing settings that frequently utilize this material for fabrication. -
Question:
Is the 4140 Alloy Steel Round Bar available in different lengths?
Answer: Yes, the 4140 Alloy Steel Round Bar is commonly available in various lengths, including standard lengths like 12 feet. Depending on your specific project needs, you can often find custom lengths available to minimize waste and fit your design requirements effectively. This flexibility in length allows for optimal cutting based on your unique manufacturing or construction projects. -
Question:
Where can I buy the OnlineMetals 4140 Alloy Steel Round Bar?
Answer: You can buy the OnlineMetals 4140 Alloy Steel Round Bar from Ubuy, which is a reliable online shopping platform that offers various materials and products tailored to meet your needs. Ubuy provides a user-friendly interface for browsing through specifications of this alloy steel round bar and allows you to order it conveniently from your location in Saint Lucia.
Online Metals Rods Editorial Review
No editorial reviews found
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
Platform Trust & Buyer Confidence
MT
Mohd
Verified buyer
“The product received very good packaging & safe…Thank You”
16 June 2026 · via Trustpilot
SJ
Shawati
Verified buyer
“Accurate delivery timing given”
16 June 2026 · via Trustpilot
YB
Youcef
Verified buyer
“Not madly expensive like I thought, and much quicker than promised.”
15 June 2026 · via Trustpilot
LM
Leila
Verified buyer
“Never dealt with Ubuy before, but everything worked out great. Seamless cross border purchasing and shipping. Thanks!”
6/7/2026 · via Trustpilot
KA
Kwame
Verified buyer
“The process was smooth, with clear communication and timelines. This was my 1st purchase and I am really impressed. I will definitely be coming back.”
12 June 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.
XCD 296
Order now and get it around Sunday, August 09
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
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.