канавка під муфту
slot-type groove
spiral parallel groove
barrel groove
breechblock-stop groove
cam groove
circular groove (of ammunition)
crimping groove
dismounting groove
vertical oil groove
extraction groove
extractor groove
finger groove
four-groove barrel
groove
coupling hook
elastic coupling
energy coupling
U-joint (universal joint / universal coupling)
ball coupling
bevel coupling
coupling bar
coupling joint
coupling lever
coupling rod
coupling sleeve
dynamo coupling
universal coupling
hose coupling
flexible coupling
fluid coupling
fuel pump spindle coupling
pressure fuel(l)ing coupling