The best replacement for 520 is 530 chain.

The best alternatives to 520 are rated as following:
★★★★★  530 chain
★★★★  525 chain
★★★  620
★★  521
★★  90
★★  525
★  530
★  920
★  720
★  625
★  lht
★  4130
★  610
★  530 ssd
★  525 bmw
★  moto g
★  820
★  530 motorcycle chain
★  550
  8s
  50 chain
  s duos
  430
  530 intel ssd
  620 which is better
  dsm 320
  gt 430
  i90
  lumia 521
  galaxy trend
  surly lht
  330
  i7 720
  surly long haul trucker
  210
  samsung 840 pro
  amd radeon hd 6450
  samsung 830
  xperia e
  a610 620
  elph 300
  crucial m4
  lumia 620
  i5 430
  gt 610

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Google Trends

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520
530 chain
525 chain