Carbon Steel Fasteners
Low and medium carbon steels used for general engineering, structural and machinery fasteners, normally supplied with a protective coating because they offer no inherent corrosion resistance.
Carbon Steel Fasteners
Low and medium carbon steels used for general engineering, structural and machinery fasteners, normally supplied with a protective coating because they offer no inherent corrosion resistance.
Common standards: ASTM A307, A563, ISO 898-1/-2, SAE J429, DIN/ISO dimensional standards
Common Grades
| Grade | Description |
|---|---|
| Class 4.6 | Low-carbon general purpose (ISO 898-1) |
| ASTM A307 Gr A / B | General purpose bolts and studs |
| Class 8.8 / SAE Gr 5 | Medium carbon, quenched and tempered |
General industry information. Grades listed are not a statement of current stock or manufacture; availability is confirmed at enquiry.
Chemical Composition (% typical specification limits)
| Steel | C | Mn | P max | S max |
|---|---|---|---|---|
| 1018 | 0.15–0.20 | 0.60–0.90 | 0.040 | 0.050 |
| 1045 | 0.43–0.50 | 0.60–0.90 | 0.040 | 0.050 |
Limits vary slightly by product standard. Actual heat analysis is reported on the Material Test Certificate.
Mechanical Properties
| Grade / class | Tensile (MPa) | Yield (MPa) | Hardness |
|---|---|---|---|
| ISO 898-1 Class 4.6 | 400 min | 240 min | 120–220 HV |
| ISO 898-1 Class 8.8 (≤M16) | 800 min | 640 min | 22–32 HRC |
| ASTM A307 Gr A | 415 min | – | 69–100 HRB |
| SAE J429 Gr 5 (≤1 in) | 830 min | 635 min | 25–34 HRC |
Minimum values per cited standards; they vary by diameter, condition and heat treatment.
Available Fastener Types
Available as bolts, nuts, screws, washers, studs and special fasteners to drawing, subject to size and standard. Browse all products.
Applications and Industries
Finishing, Quality and Packaging
Finishes such as passivation, plating, galvanizing or customer-specified treatments are selected to suit the material and service. Inspection may include dimensional, visual, mechanical and chemical checks, PMI where applicable, and Material Test Certificates (EN 10204 3.1 where requested). Goods are packed for export. See Quality.