High Tensile Fasteners
Medium carbon and alloy steels quenched and tempered to property classes 8.8, 10.9 and 12.9 or equivalent ASTM/SAE grades, for highly loaded joints.
High Tensile Fasteners
Medium carbon and alloy steels quenched and tempered to property classes 8.8, 10.9 and 12.9 or equivalent ASTM/SAE grades, for highly loaded joints.
Common standards: ISO 898-1/-2, ASTM A193 B7, A354 BD, A325, A490, SAE J429 Gr 5/8
Common Grades
| Grade | Description |
|---|---|
| Class 8.8 | Medium carbon, quenched and tempered |
| Class 10.9 | Alloy or boron steel, quenched and tempered |
| Class 12.9 | Alloy steel, used mainly for socket head screws |
| SAE Gr 5 / Gr 8 | Inch series equivalents |
General industry information. Grades listed are not a statement of current stock or manufacture; availability is confirmed at enquiry.
Chemical Composition (% typical specification limits)
| Class | C | P max | S max | B max |
|---|---|---|---|---|
| 8.8 | 0.15–0.40 | 0.025 | 0.025 | 0.003 |
| 10.9 | 0.20–0.55 | 0.025 | 0.025 | 0.003 |
| 12.9 | 0.30–0.50 | 0.020 | 0.020 | 0.003 |
Limits vary slightly by product standard. Actual heat analysis is reported on the Material Test Certificate.
Mechanical Properties
| Class / grade | Tensile (MPa) | Yield (MPa) | Hardness |
|---|---|---|---|
| ISO 898-1 8.8 (≤M16) | 800 min | 640 min | 22–32 HRC |
| ISO 898-1 10.9 | 1040 min | 940 min | 32–39 HRC |
| ISO 898-1 12.9 | 1220 min | 1100 min | 39–44 HRC |
| SAE Gr 8 (≤1 in) | 1035 min | 895 min | 33–39 HRC |
| ASTM A354 BD | 1035 min | 895 min | 33–39 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.