Bright Bars Technical Catalogue
Precision tolerance bright steel bars produced by cold drawing, peeling and grinding processes
Processing Methods
Select for technical details
Steel Grades
Cold Drawing
Cold drawing is the process of pulling hot-rolled steel bars through a die at room temperature to improve dimensional tolerance, surface quality, and mechanical properties. It is the most common bright bar production method.
Dimension & Tolerance Table
| Profile | Size Range (mm) | Tolerance | Standard | Surface (Ra) |
|---|---|---|---|---|
| Round | 4 - 20 | h9 | EN 10278 | ≤ 1.6 µm |
| Round | 20 - 50 | h9 | EN 10278 | ≤ 2.0 µm |
| Round | 50 - 90 | h10/h11 | EN 10278 | ≤ 3.2 µm |
| Hexagon | 6 - 30 | h9 | EN 10278 | ≤ 1.6 µm |
| Hexagon | 30 - 70 | h10/h11 | EN 10278 | ≤ 2.5 µm |
| Square | 8 - 30 | h9 | EN 10278 | ≤ 2.0 µm |
| Square | 30 - 60 | h10/h11 | EN 10278 | ≤ 3.2 µm |
| Flat | 10x5 - 80x20 | h11 | EN 10278 | ≤ 3.2 µm |
| Flat | 80x20 - 150x30 | h11 | EN 10278 | ≤ 3.2 µm |
Key Features
- Precise dimensional tolerance (h9/h10/h11)
- Improved surface quality (Ra 0.8 - 3.2 µm)
- Enhanced tensile strength and yield strength
- Smooth surface suitable for CNC and automatic lathes
- Chamfering and cut-to-length service
- Fast machining on high-speed machines
- Low scrap rate - material savings
- Raw surface suitable for coating processes
- Wide profile range (round, hexagon, square, flat)
- Defect-free products for safety-critical parts
Applications
- Automotive parts (shafts, pistons, axles)
- Hydraulic and pneumatic cylinder bodies
- CNC automatic lathe machining
- Machine manufacturing industry
- Bolts, nuts, and fasteners
- Furniture and appliance components
- Gear and bearing shafts
- Agricultural machinery parts
Technical Notes
- Cold drawing increases tensile strength by 15-20%.
- h9 tolerance is applied as standard for diameters below 50mm.
- For diameters above 50mm, h10 or h11 tolerance is preferred.
- Flat profiles have separate tolerances for width and thickness.
- Standard length: 3000-6000mm, custom cutting available on request.
- Chamfering provides easy feeding into automatic machines.
- Cold drawn products should be selected prior to heat treatment.
Detailed Technical Information and Quotation
Contact our expert team for detailed technical documents, application recommendations, and custom size quotations regarding this product type.
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