허용길이

Permissible Length

허용압력

Allowable Pressure

허용응력

Allowable Stress

헐거운 맞춤

Clearance Fit, Loose Fit, Running Fit, Working Fit

험프

Hump

험프속도

Hump Speed

헛돌기

Lost Motion

헤더

Header

헤드라인윈치

Head Line Winch

헤비데릭장치

Heavy Derrick Rigs