Round Bar Sizes โ Standard Dimensions, Tolerances & Uses
Choosing the correct round bar size is crucial for any project that demands strength, stability, and accuracy. Round bars, also known as rods, are used in industries ranging from construction and machinery to fabrication and automotive parts. Whether youโre a buyer, fabricator, or engineer, understanding round bar sizes ensures you’re selecting the most efficient material for the job.
๐ What is a Round Bar?
A round bar is a long, cylindrical metal bar used in a wide variety of engineering and structural applications. These bars are available in various diameters, grades, and lengths, and are made from materials such as mild steel, stainless steel, carbon steel, or alloy steel.
๐ Standard Round Bar Sizes (Metric)
Round bars are commonly available in diameters ranging from 6 mm to 300 mm. Lengths can vary, but standard lengths include:
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3 meters
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6 meters
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12 meters
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Custom cut-to-lengths available
๐ Diameter Range & Tolerances:
| Diameter (mm) | Tolerance (Hot Rolled) | Tolerance (Cold Drawn) |
|---|---|---|
| 6 โ 25 mm | h11 | h9 |
| 26 โ 50 mm | h11 | h9 |
| 51 โ 100 mm | h11 | h9 |
| 101 โ 300 mm | h11 | h9 |
โ ๏ธ Tolerances vary depending on the manufacturing method and grade of the bar.
๐ ๏ธ Types of Round Bars Based on Finish
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Hot Rolled Round Bar โ Used for structural and general engineering
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Cold Drawn Round Bar โ Better surface finish and tighter tolerances
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Bright Round Bar โ Mirror-like finish, ideal for precision machining
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Forged Round Bar โ Heavy-duty bars used in industrial machinery
๐งฐ Common Applications of Round Bars
Round bars are highly versatile and used in:
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โ๏ธ Construction โ Columns, beams, supports
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โ๏ธ Automotive โ Axles, fasteners, crankshafts
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โ๏ธ Fabrication โ Railings, gates, grills
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โ๏ธ Engineering โ Shafts, pins, couplings, spacers
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โ๏ธ Oil & Gas โ Drill rods, hydraulic systems
๐ฉ Round Bar Material Grades
Round bars are available in various grades depending on the application:
| Material | Popular Grades | Use Cases |
|---|---|---|
| Mild Steel (MS) | IS 2062, A36 | Structural fabrication, RCC work |
| Carbon Steel | C45, EN8 | Shafts, fasteners, general tools |
| Alloy Steel | EN19, 4140 | Heavy-duty components, gears |
| Stainless Steel | SS304, SS316, SS410 | Marine, pharma, food-grade parts |
| Tool Steel | D2, H13, M2 | Molds, dies, punches |
๐ Round Bar Size Chart (Selected Range)
| Diameter (mm) | Weight (kg/m) |
|---|---|
| 10 mm | 0.62 |
| 20 mm | 2.47 |
| 30 mm | 5.55 |
| 40 mm | 9.87 |
| 50 mm | 15.41 |
| 60 mm | 22.23 |
๐งฎ Weight Formula:
Weight = (ฯ/4) ร Dยฒ ร 0.00785
๐ Related Products You May Need
These are frequently used in similar structural and precision engineering applications.
๐ท๏ธ Benefits of Standardized Round Bar Sizes
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โ๏ธ Easy for CNC and machining operations
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โ๏ธ Predictable performance in load-bearing structures
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โ๏ธ Available with test certificates for engineering applications
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โ๏ธ Less material wastage during cutting and processing
๐ Packaging & Delivery Options
We deliver round bars across India in:
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Bundles with steel strapping
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Custom lengths
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Shrink-wrapped / export packaging
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PAN India supply: Mumbai, Chennai, Pune, Hyderabad, Ahmedabad
๐ Get the Right Round Bar for Your Project
Need help selecting the perfect round bar size?
๐ Address: Plot No. 15, Khan compound, Taloja M.I.D.C. Navi-Mumbai 410208, Maharashtra INDIA
๐ Phone: +91 7385863226
๐ง Email:info@amengineeringworks.in