Grade B steel: Medium strength, medium carbon steel.Grade A steel: Low strength, low carbon steel.Similar to the above, the ASTM grading system is based on chemical composition and mechanical properties of the steel. The American Society for Testing & Materials Grading System Grade 8 steel: Suitable for situations that require a high strength and hardness of steel.Once again, most suited to medium strength and hardness applications. Grade 5 steel: Medium strength, medium carbon steel.Best suited for general applications where low to moderate strength is required. Grade 2 steel: refers to a low carbon steel with low strength.Here’s a list of the most common grades of SAE steel fasteners. The Society of Automotive Engineers Grading SystemĪs with the British version, the SAE system, grades steel fasteners based on the strength and hardness of the steel being used.
Grade 12.9 steel: This grade of steel is usually used in situations that require a high strength, high carbon steel, such as military and aerospace projects. It is the ability of steel to sustain deformation under tensile stress before failure. Situations where this would be required is in cases of extreme weather and heat fluctuations. Commonly used in manufacturing and engineering, ductility can be extremely important. Grade 5.8 steel: Once again, a medium carbon steel with medium strength, but with increased ductility. Grade 5.6 steel: This grade of steel is perfect for applications that need a medium strength, medium carbon steel content, but with a lower level of hardness, allowing for the steel to be deformed and manipulated during installation. In addition to the more common grades of steel listed above, there are some more specialised grades of steel for specific fastener needs available under the BSI (British Standards Institute) system. This grade of steel is required for high strength and reliability projects. The highest, most common strength carbon steel available. Grade 10.9 steel: Fasteners made from a grade 10.9 consist of a higher strength alloy steel and which has a tensile strength of 1000 MPa. This is the most common grade used for bolts and fasteners and some of Fixabolt’s biggest sellers. This medium strength steel has a medium quantity of carbon steel and is more suitable for projects where more strength is needed than grade 4.6 fasteners. Grade 8.8 steel: These types of fasteners are made from medium carbon steel and have a tensile strength of 800 MPa (megapascals). Nuts and bolts made of this quality steel would be suitable for most general applications where you only require a modest amount of strength. Grade 4.6 steel: Low carbon steel content resulting in low strength. The BSI system is used for metric bolts and ranges from 4 to 10. The Unified National Thread (UNT) system grades bolts on a scale from 1 to 5 for imperial bolts, with 5 being the strongest. There are two systems of grading in the UK, one for metric and the other imperial. The BSI is the oldest standardisation and can be used across 172 countries, although it is mostly used in the UK. The British Standard Institute of Steel Grading In the UK, we tend to refer to the British Standard or the ISO. In the USA they use the Society of Automotive Engineers (SAE) and the American Society for Testing and Materials (ASTM). The grade of steel fasteners refers to the quality and strength of the steel used in its manufacture, and there are several systems used to grade steel. Here’s an in-depth guide to the most common grades of fasteners under the BSI (British Standard Institute) system.
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