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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