The best replacement for grade 5 is grade 8 bolts.

The best alternatives to grade 5 are rated as following:
★★★★★  grade 8 bolts
★★★★  a325
★★★  grade 8 bolt
★★  grade 2
★★  8.8
★★  b7
★★  grade 8
★  grade 8 steel
★  grade 2 titanium
★  grade 23 titanium
★  a307
★  a325 bolt
★  grade 8 u-bolts
  grade 2 bolts
  grade 8.8
  10.9
  class 8.8
  8 bolts
  grade 2 bolt
  a449
  grade 5
  8 bolt
  astm a325
  grade 8 leaf spring bolts

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grade 5
grade 8 bolts
a325