12mm
Common bolt diameter
A measurement of twelve millimeters, slightly under half an inch.
In photography, 12mm describes an ultra-wide-angle lens: I shoot architecture with a 12mm.
In ammunition, it specifies bullet diameter.
The notation appears in specifications for bolts, tubing, film formats, and countless other precisely sized objects.
Threaded rod for nuts
- screwThreaded metal fastener
- nutHard-shelled seed
- washerSpacer ring for fasteners
- socketHollow receiving cavity
wrench · thread · fastener · hex · spanner · torque · metric · diameter
Small rounded mass
- airgunPneumatic projectile launcher
- caliberBore diameter or quality
- roundCurved like circle
- shotshellAmmunition containing multiple projectiles
buckshot · birdshot · cartridge · slug · projectile · bore · gauge · rimfire
Light-focusing curved glass
- wide-angleEncompassing broad vistas
- focal lengthLens-to-convergence-point distance
- apertureAdjustable optical inlet
- mountClimb up or steed
filter · cinema · mirrorless · sensor · optics · depth of field · prime · zoom
Pierced ornament for threading
- pearlMollusk-formed gemstone
- gemstoneOrnamental cut mineral
- studUpright wall framing
- earringLobe-worn adornment
pendant · setting · stone · cabochon · spacer · clasp · chain · diameter
bolt
Threaded rod for nuts
socket · wrench · thread · fastener · hex · spanner · torque · metric · diameter · shaft
pellet
Small rounded mass
shotshell · buckshot · birdshot · cartridge · slug · projectile · bore · gauge · rimfire · airsoft
lens
Light-focusing curved glass
- wide-angleEncompassing broad vistas
- focal lengthLens-to-convergence-point distance
- apertureAdjustable optical inlet
mount · filter · cinema · mirrorless · sensor · optics · depth of field · prime · zoom · f-stop
bead
Pierced ornament for threading
earring · pendant · setting · stone · cabochon · spacer · clasp · chain · diameter · round
catheter
Inserted medical drainage tube
- tubingHollow cylindrical conduit
- cannulaThin medical insertion tube
- endoscopeInternal examination instrument
trocar · port · drainage · surgical · lumen · gauge · IV · diameter · insertion · scope
pipe
Hollow conveyance channel
coupling · diameter · wall thickness · rod · bar · shaft · tolerance · specification · clearance · bore