12mm

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12 mm or 12 mm gauge may refer to:

Rail transport modelling[edit]

  • TT gauge, 1:120 scale with rails 12 mm apart, representing standard gauge
  • HOn3½ gauge, 1:87.1 scale with rails 12 mm apart, representing 3-foot-6-inch gauge
  • H0m, 1:87 scale with rails 12 mm apart, representing metre gauge
  • 00n3, 1:76 scale with rails 12 mm apart, representing 3-foot gauge
  • 5.5 mm scale, 1:55 scale with rails 12 mm apart, representing narrow gauge
  • On2 gauge, 1:48 scale with rails 12.7 mm apart, representing narrow gauge

Firearms[edit]