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Tech Tips
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Ed's Tech Tip: Hex Cap Screw Strengths
As salespeople we are often asked questions pertaining to the strengths of hex cap screws. In this article I will provide you with a quick reference chart. The chart shows the materials used in manufacturing along with proof, tensile and yield strengths of hex cap screws.The cap screws most commonly ordered have strengths referred to as grades 2, 5 and 8. The grade 2 is the weakest manufactured with a low carbon steel. The grade 8 is the strongest of the three manufactured with a medium carbon alloy steel, quenched and tempered. If you have an assembly requiring a large amount of preload or strength, a grade 12 manufactured from alloy steel, quenched and tempered is available. There are two classes of metric fasteners included in this chart. Often there is confusion regarding the strength of metric bolts. Please note that a class 8.8 is not a grade 8. The class 8.8 has properties stronger than a grade 5 bolt but less then a grade 8. The class 10.9 cap screw has properties similar to the grade 8 but less strength to the grade 12.
To follow is a chart with technical information relating to the mechanical properties and the grade markings of hex cap screws. I refer to this sheet often and find that our customers appreciate having it as a quick reference.
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