The best replacement for grade 8 is grade 5 bolts.

The best alternatives to grade 8 are rated as following:
★★★★★  grade 5 bolts
★★★★  grade 5
★★★  a325
★★★  grade 9 bolts
★★  stainless
★★  b7
★★  12.9
★★  grade 9
★★  grade 10.9
★★  10.9
★  grade 5 bolt
★  class 8.8
★  grade c
★  b7 bolts
★  8.8
★  astm a574
★  grade 10 bolts
  grade 10
  stainless steel bolts
  class 10.9 bolts
  metric 10.9
  grade 10.9 bolts

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