Carbon Steel Fasteners
Overview
Carbon steel fasteners are the workhorse of the fastening industry, offering an optimal balance of strength, cost-effectiveness, and availability. These fasteners are used in the vast majority of industrial and construction applications where corrosion resistance is not the primary concern.
We manufacture carbon steel fasteners in various grades from 4.8 to 12.9, with a wide range of surface finishes including zinc plating, hot-dip galvanizing, and black oxide to provide varying levels of corrosion protection.
Strength Grades
- Grade 4.8 - General purpose
- Grade 5.8 - Structural
- Grade 8.8 - High strength
- Grade 10.9 - Very high strength
- Grade 12.9 - Ultra high strength
- SAE Grades 2, 5, 8
Finishes Available
- Plain (oiled)
- Zinc plated (clear/blue)
- Yellow zinc plated
- Hot-dip galvanized
- Black oxide
- Mechanical galvanizing
Technical Specifications
Popular Products
Grade 8.8 Hex Bolt
High-strength structural bolts for machinery and construction. Zinc plated for corrosion protection. Full and partial thread options available.
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Grade 12.9 Socket Screw
Ultra-high strength socket head cap screws for critical applications. Alloy steel with black oxide finish. Maximum strength in compact design.
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Hot-Dip Galvanized Bolt
Heavy-duty bolts with thick zinc coating for outdoor and marine applications. Superior corrosion resistance for structural steel connections.
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Carriage Bolt
Round head bolts with square neck for wood and metal applications. Self-locking design prevents rotation during tightening.
View DetailsGrade Selection Guide
| Grade | Tensile Strength | Yield Strength | Typical Applications |
|---|---|---|---|
| 4.8 | 400 MPa | 320 MPa | General purpose, light duty |
| 5.8 | 500 MPa | 400 MPa | Structural steel, construction |
| 8.8 | 800 MPa | 640 MPa | Machinery, automotive, structures |
| 10.9 | 1000 MPa | 900 MPa | Heavy machinery, engines |
| 12.9 | 1200 MPa | 1080 MPa | High stress, critical applications |
Surface Treatment Options
Choose the right finish for your application:
- Plain/Oiled: Basic protection for short-term storage and indoor use
- Zinc Plated: Good corrosion resistance for indoor and mild outdoor environments
- Yellow Zinc: Enhanced corrosion protection with chromate conversion coating
- Hot-Dip Galvanized: Thick zinc layer for harsh outdoor and marine environments
- Black Oxide: Decorative finish with minimal corrosion protection
- Mechanical Galvanizing: Uniform coating without hydrogen embrittlement risk