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Hex cap screw strength comparison

¹Amount of force required to pull apart fastener / ²Converted from megapascals (MPa) PSI/145 = MPa or MPa x 145 = PS

Inch

  • Grade indicates strength level in the inch system.
  • When specifying inch fastener strengths, call them out as grades.

Metric

  • Property class indicates strength level in the metric system.
  • When specifying metric fastener strengths, call them out as property classes. Don’t confusingly ask for a metric grade 8 hex cap screw. Ask for a metric property class 10.9 instead.

Warning: Similar numbers used for grade and property class designations don’t stand for the same strength. For example, a Grade 8 hex cap screw and a property class 8.8 hex cap screw have different tensile strengths. See table.

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