Here is a quick reference guide which should help you in choosing the correct fasteners from our range!

Metric fastener strength is denoted by a property class which is equivalent to a strength grade. Briefly:

  • Class 4.6 is approximately equivalent to SAE J429 Grade 1 and ASTM A307 Grade A
  • Class 5.8 is approximately equivalent to SAE J429 Grade 2
  • Class 8.8 is approximately equivalent to SAE J429 Grade 5 and ASTM A449
  • Class 9.8 is approximately 9% stronger than equivalent to SAE J429 Grade 5 and ASTM A449
  • Class 10.9 is approximately equivalent to SAE J429 Grade 8 and ASTM A354 Grade BD

For information there is no direct inch equivalent to the metric 12.9 property class.

Leave a Reply