Grade or Class and Head Marking For SI Bolts

SAE Grade Diameter Draft Tension SI Class Diameter Draft Tension
5 1/4" 105.000 PSI 8.8 Up to 16 MM 800 MP A
5 1 1-1/2" 120.000 PSI 8.8 17 to 36 mm 830 MP A
8 1/4" 1-1/2" 150,000 PSI 10.9 Up to 36 MM 1040 MP A

 

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