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To quote Chuck from another post.
There is no "grade 10" in the SAE bolt grade system. Some metric bolts are CLASS 10.9 per the folllowing specifications:
Class 10.9:
  • Head Marking: 10.9
    • Material: Alloy steel, quenched and tempered
    • Size Range: 5-mm to 100-mm
Proof Load (MPa): 830Min. Yield Strength (MPa): 940Min. Tensile Strength (MPa): 1040
Did you mean class 10.9??? The Deere part is a CH19101 BOLT which is an M8 x 45 metric bolt and most likely is a class 10.9... How were the bolt heads marked on the bolts you removed??

Note: a metric class 10.9 is roughly equivalent to the strength of a Class 8 SAE bolt...

Chuck
 
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Your worried about the strength of a water pump bolt?
The ones he used were the same grade and strength as what he would have gotten at John Deere. So he essentially just put new bolts in,
 
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