At Steelmet Industries, we understand that the smallest components often bear the biggest responsibilities. Our cold drawn steel bright bars form the foundation for high-performance bolts, screws, nuts, washers, and rivets that hold critical infrastructure together – from skyscrapers to spacecraft.
Why Precision Matters in Fastener Manufacturing
Modern fasteners must meet exacting standards:
✔ Consistent thread formation for perfect engagement
✔ Reliable tensile strength under dynamic loads
✔ Corrosion resistance for harsh environments
✔ Dimensional stability across temperature variations
Our bright bars deliver:
✓ Surface finish of 0.8-1.6μm Ra for smooth thread rolling
✓ Diameter tolerance of ±0.02mm for precision fits
✓ Hardness range of 22-32 HRC (ideal for cold forming)
✓ Custom diameters from 3mm to 120mm
Key Fastener Applications
1. Structural Fasteners
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ASTM A325/A490 structural bolts for steel construction
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High-strength anchor bolts (Grade 8.8/10.9)
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Seismic-resistant moment connection bolts
2. Automotive Fasteners
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Engine mounting bolts (ISO 898-1 Class 10.9)
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Wheel studs and hub bolts
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Transmission housing screws
3. Specialized Fasteners
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Aerospace rivets (NASM/MS standards)
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Marine-grade stainless fasteners (AISI 316)
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High-temperature alloy fasteners for power plants
Technical Specifications
| Grade | Standard | Tensile Strength | Yield Strength | Key Applications |
|---|---|---|---|---|
| C45 | ISO 898-1 | 800-1000 MPa | 640 MPa min | General purpose bolts |
| 40CrMo4 | ASTM A193 B7 | 1000-1200 MPa | 850 MPa min | High-temp fasteners |
| 316 Stainless | ASTM A193 B8M | 515 MPa min | 205 MPa min | Marine/chemical plants |
| 10B21 | SAE J429 | 900 MPa min | 700 MPa min | Cold-formed screws |
Discover our fastener-grade bright bars at Steelmet Industries’ website or request samples for your next production run.
