U字彙

u-bolt
umbra
UNC（unified coaress thread series）
undercut
underground main
underlined dimension
underlining
undevelopable surface
undimensioned view
UNEF(unified extra-fine thread series)
unfaced bolt
UNF（unified fine thread series）
uniform line
union
United States thread
universal drafting machine
unsectioned half
unslotted round-head bolt
unsymmetrical shape
UNS（unified special thread series）
untoleranced dimension
Unwin method
upright style of letters
upward
useful length of screw thread
USG（United States gage）
USS（United States standard）

under deviation
under floor system

unequal-leg angle
unequal-leg fillet weld

unfinished dimension
unfinished surface

unidirectional dimensions system
unidirectional system

unified screw-thread class
unified thread

unilateral tolerance
unilateral tolerance method
unilateral tolerance system

unit
unit assembly drawing
unit of measurement
unit production

unless otherwise specified
unless otherwise stated

unmachined part
unmachined surface

unnecessary dimension
unnecessary scale
unnecessary view

upper deviation
upper die
upper face
upper limit
upper right corner
upper right-hand quadrant

upset
upset weld

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