Steel continues to serve as the foundation for industries around the world, and among the most trusted grades in use today is AISI 1018 Round Bar (also referred to as SAE 1018 Round Bars). Known for its balance of strength, machinability, and weldability, this mild steel grade is essential for applications ranging from foundation bolts.
At Surya Steel Industries, we manufacture high-quality AISI 1018 Round Bars for Foundational Bolts, Square Bars, and Hexagonal Bars in a wide range of sizes and finishes. Whether you’re fabricating structural supports or high-speed machine components, our bright bars deliver dimensional precision, mechanical reliability, and excellent surface quality.
What is AISI/SAI 1018 Steel?
AISI/SAI 1018 is a low-carbon steel grade, valued for its predictable performance, smooth surface finish, and consistent chemical composition. It belongs to the family of mild steels and is commonly used in structural steel, automotive parts, and general machining.
Chemical Composition (Typical):
| Element | Percentage |
|---|---|
| Carbon (C) | 0.15 – 0.20% |
| Manganese (Mn) | 0.60 – 0.90% |
| Phosphorus (P) | ≤ 0.04% |
| Sulfur (S) | ≤ 0.05% |
With a low carbon content and moderate manganese level, this steel is easy to weld, cut, and form. It’s ideal for projects requiring moderate strength and high dimensional accuracy.
AISI 1018 Round Bars/SAI 1018 Round Bar
What is an AISI 1018 Round Bar/SAI 1018 Round Bar?
An AISI 1018 Round Bar for Foundational Bolts is a cylindrical steel rod made from 1018 mild steel. These bars are widely used across multiple sectors for their adaptability, strength, and uniform surface finish. The round cross-section allows for rotational symmetry, making it suitable for shafts, pins, foundation bolts, axles, and turned components.
At Surya Steel Industries, our MS Round Bars are manufactured with precision on fully automatic rolling mills, ensuring consistent shape, size, and quality. Available in diameters from 8 mm to 40 mm, these bars are crafted to meet the stringent demands of structural and engineering applications.
Key Features of AISI 1018 Round Bars/SAI 1018 Round Bar
- Excellent Machinability: Ideal for turning, drilling, threading, and milling operations.
- Superior Weldability: Can be welded without the need for preheating or post-weld treatment.
- Consistent Mechanical Strength: Balanced strength-to-ductility ratio for load-bearing components.
- Smooth Bright Bar Finish: Ready for precision machining and surface treatments.
- Bright Bar Available: For critical machining jobs requiring tight tolerances.
Applications of AISI 1018 Round Bars/SAI 1018 Round Bar
Due to their dimensional uniformity and mechanical versatility, AISI 1018 Bright Bars are extensively used in:
- Foundation Bolts: Secure structural columns and base plates in civil and industrial construction.
- Shafts & Spindles: In motors, conveyors, and mechanical assemblies.
- Pins & Dowel Rods: Where alignment and rotational accuracy are critical.
- Automotive Parts: Axles, rods, bushings, and mounting elements.
- Machined Fasteners: Screws, studs, and threaded inserts.
These bright bars also play a crucial role in the manufacture of equipment used in agriculture, engineering, and scaffolding.
Mechanical Properties of AISI/SAI 1018 Round Bars
| Property | Typical Value |
| Tensile Strength | 440–790 MPa |
| Yield Strength | 370–500 MPa |
| Elongation (%) | ≥ 15% |
| Hardness (Brinell) | 126–179 HB |
These properties make the bars strong enough to bear structural loads while remaining ductile for machining and shaping.
Surya Steel’s Testing & Quality Assurance
To ensure each bar meets both industry standards and client specifications, every batch of AISI 1018 Round Bars is subjected to:
- Chemical Testing using advanced spectrometers
- Mechanical Testing with Universal Testing Machines (UTM)
- Visual and Surface Inspections
- Dimensional Accuracy Checks using calibrated instruments
Additionally, our plant is equipped with:
- In-house Furnace & CCM Plant
- Fully Automatic Rolling Mill
- Vacuum Degassing & EMS (under installation)
- CNC Roll Turning Machines
This infrastructure enables us to deliver bars with unmatched consistency and zero defect material.
AISI/SAI 1018 Round Bar Size & Weight Chart
| Diameter (mm) | Weight per Meter (kg) |
| 8 mm | 0.395 |
| 9 mm | 0.500 |
| 10 mm | 0.617 |
| 11 mm | 0.742 |
| 12 mm | 0.888 |
| 13 mm | 1.070 |
| 14 mm | 1.210 |
| 15 mm | 1.390 |
| 16 mm | 1.580 |
| 17 mm | 1.770 |
| 18 mm | 2.000 |
| 19 mm | 2.240 |
| 20 mm | 2.470 |
| 22 mm | 2.980 |
| 25 mm | 3.850 |
| 28 mm | 4.830 |
| 30 mm | 5.550 |
| 32 mm | 6.320 |
| 36 mm | 7.990 |
| 38 mm | 8.880 |
| 40 mm | 9.870 |
Note: Weights are theoretical and may slightly vary based on manufacturing tolerances.
AISI 1018 Square Bars
What is an AISI 1018 Square Bar?
An AISI 1018 Square Bar is a solid steel bar with a square cross-section, manufactured using low-carbon steel. This profile is ideal for structural applications where flat surfaces and 90-degree alignment are essential. These bars provide excellent dimensional accuracy and can be easily cut, welded, or machined for a wide range of industrial applications.
At Surya Steel Industries, we produce MS square bars from 8 mm to 36 mm, available in bright bar finish and customized lengths. All products undergo rigorous testing to meet structural and mechanical performance standards.
Applications of AISI 1018 Square Bars
- Agricultural equipment frames
- Fabrication of steel brackets and fixtures
- Structural supports in buildings and industrial machines
- Engineering machinery components
- General-purpose fabrication
Their shape makes square bars easier to align and fit into fixtures, reducing the need for machining during assembly.
Key Features
- High weldability with low risk of cracking
- Excellent machinability for threading, drilling, and shaping
- Smooth edges and bright finish (where required)
- Tight dimensional tolerances for structural use
AISI 1018 Square Bar Size & Weight Chart
| Size (mm x mm) | Weight per Meter (kg) |
| 8 x 8 | 0.503 |
| 10 x 10 | 0.785 |
| 12 x 12 | 1.131 |
| 14 x 14 | 1.538 |
| 15 x 15 | 1.767 |
| 16 x 16 | 2.010 |
| 18 x 18 | 2.538 |
| 20 x 20 | 3.140 |
| 22 x 22 | 3.802 |
| 25 x 25 | 4.910 |
| 28 x 28 | 6.157 |
| 30 x 30 | 7.065 |
| 32 x 32 | 8.038 |
| 34 x 34 | 9.080 |
| 36 x 36 | 10.180 |
Note: These are theoretical weights. Variations may occur depending on finish and tolerance requirements.
AISI 1018 Hexagonal Bars
What is an AISI 1018 Hexagonal Bar?
An AISI 1018 Hexagonal Bar is a solid six-sided steel bar manufactured from low-carbon mild steel. Its distinct hexagonal shape provides better grip in tools and machines, making it particularly suitable for machining, threading, and fastening applications. These bars are known for their geometric accuracy and are widely used in the manufacturing of nuts, bolts, hydraulic fittings, and precision tools.
At Surya Steel Industries, our MS hexagonal bars range from 8 mm to 36 mm across flats, and each bar is rolled and tested under stringent quality controls to ensure dimensional precision and mechanical consistency.
Applications of AISI 1018 Hex Bars
- Nut and bolt production
- Fasteners and threaded rods
- Hydraulic and fluid system connectors
- Forged components and shafts
- Tool parts and mechanical linkages
Their symmetrical shape and clean finish make them especially valuable for use in high-speed CNC machines, forging presses, and automated lathes.
Key Features
- Six-sided uniform geometry for enhanced machinability
- High ductility and moderate strength
- Smooth surface finish suitable for threading and polishing
- Bright bar quality available
- Excellent for cold forming and shaping
AISI 1018 Hex Bar Size & Weight Chart
| Across Flats (mm) | Weight per Meter (kg) |
|---|---|
| 8 mm | 0.433 |
| 10 mm | 0.676 |
| 12 mm | 0.974 |
| 14 mm | 1.327 |
| 16 mm | 1.736 |
| 18 mm | 2.200 |
| 20 mm | 2.720 |
| 22 mm | 3.294 |
| 24 mm | 3.924 |
| 25 mm | 4.243 |
| 28 mm | 5.336 |
| 30 mm | 6.081 |
| 32 mm | 6.962 |
| 34 mm | 7.960 |
| 36 mm | 8.878 |
Note: Weight values are approximate and may vary slightly based on finish and tolerance.
Manufacturing Excellence at Surya Steel Industries
Our state-of-the-art manufacturing facility in Mandi Gobindgarh, Punjab, is equipped with advanced machinery and testing equipment to ensure the highest quality standards:
- In-House Furnace & CCM Plant: Ensures consistent quality from raw material processing.
- Fully Automatic Rolling Mill: Provides precise dimensions and surface finish.
- CNC Roll Turning Machines: Enhances accuracy in shaping bars.
- Vacuum Degassing & EMS (Under Installation): Improves steel purity and homogeneity.
- Mechanical & Chemical Testing Labs: Equipped with UTM and spectrometers for rigorous quality checks.
Quality Assurance and Testing
We adhere to stringent quality control measures to ensure our products meet industry standards:
- Chemical Composition Analysis: Using advanced spectrometers to verify elemental composition.
- Mechanical Testing: Assessing tensile strength, yield strength, and elongation using UTM.
- Surface Inspection: Ensuring smooth finish and absence of defects.
- Dimensional Accuracy: Utilizing precise measuring tools to maintain tight tolerances.
At Surya Steel Industries, our commitment to quality and precision ensures that our AISI 1018 Round Bars, SAE 1018 Round Bars, and AISI 1018 Bright Bars meet the highest industry standards. Whether you’re in construction, automotive, or machinery manufacturing, our products offer the reliability and performance you need.
Contact us today to learn more about our product offerings and how we can support your projects with top-quality steel solutions.