7 mm may refer to:
Rail transport modelling
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7 mm scale
7 mm scale, also known as British 0 scale is a model railway scale of 1:43.5 (or 7 mm to 1 ft; hence its name). The scale is thus different from American 0 scale (1:48) and European 0 scale (1:45) For standard gauge railways, 32 ...
, 1:43.5 scale with rails apart, representing standard gauge
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HOn2 gauge
H0f gauge (or H0i gauge) is a rail transport modelling scale representing Feldbahn-style 2 ft and 600 mm gauge railways using 1:87 HO scale running on Z gauge track. The ' NEM 010 specification defines H0f for modelling gauges , as part of the ...
, 1:87.1 scale with rails apart, representing narrow gauge
Firearms
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7 mm caliber
This is a list of firearm cartridges which have bullets in the caliber
In guns, particularly firearms, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel Gauge (firearms) ...
, bullet cartridges used in guns
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