https://www.guitarworld.com/gear/whats-the-heaviest-gauge-guitar-string-that-fits-in-a-standard-tuning-peg
What's the Heaviest-Gauge Guitar String That Fits in a Standard Tuning Peg?
“If you're like me, your low E string never gets heavier than a .046. Maybe, when you break a low E string at a gig (which is very rare), you might be forced to use your buddy's .052...”