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Questions on "F-Spacing"

I was looking at some DiMarzios today and saw that some of the models were "F-Spaced Only", This made me wonder just what is "F-Spacing"?

If someone could give me some info on what "F-Spacing" is I'd be very grateful.

GEAR:
  • Washburn T-24 Taurus Bass
  • Gibson EB-3
  • Epiphone Les Paul Custom Pro Koa - Limited Edition

F= Fender G=Gibson

Seriously though, F-spacing refers to the widest spacings on full-sized humbucking pickups. For correct string alignment and a balanced output, F-spaced humbuckers should be used in the bridge position on guitars with string spacing at the bridge of 2.1″ or 53mm (or greater).

GEAR:
  • Fender MIJ Jazzmaster JM62
  • Epiphone Dot
  • Electro-Harmonix Sovtek "Green Russian" Big Muff Pi V7C