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Grade

The classification of the bolt's material strength and performance characteristics.

5

This grade is from the SAE scale. Made of medium to low carbon steel, it is of medium strength on the grade scale.

8

This grade is part of the SAE classification. It is the minimum standard of the automotive and structural industries, plus it is used in high-temperature applications. Grade 8 is near the high end of the grade scale, although there are higher grades and strengths for more specialized fasteners.

8.2

This grade is part of the SAE classification. It's tensile strength is similar to Grade 8 near the top of the scale, however this steel is not suited to high-temperature applications.

18-8

A general designation for the most common and popular stainless steel, (300 Series) referring to the 18% chromium and 8% nickel. It's strength has a range from the middle to low end of the grade scale. All 300 series stainless steel share the ratio of chromium to nickel with varying other elements improving different properties. It has higher corrosion resistance than the 400 series stainless steels and it is non-magnetic.

A2

A type of the most common stainless steel grade. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld. This grade is always metric. The ASTM denotation for very similar grade is 304. The corrosion resistance and ease of fabrication are why this grade is used in food industry machines, appliances, architectural trim and aquatic fasteners.

Class 10.9

This is a metric grading similar to the SAE grade 8 classification, which is used in automotive, and structural industries, as well as in high temp applications. Its strength is near the high end of the grade scale, although there are higher grades and strengths for more specialized fasteners.

Class 100

Similar to 10.9, but it is case hardened

Class 8.8

This is a metric grading similar to the SAE grade 5 classification, made of medium steel and is of medium strength on the grade scale.

Class 90

Similar to 9.8, but it is case hardened

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