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кольцо жесткости stresses
astronaut.	stiffener ring
mech.eng., obs.	heel ring (на трубе); stiffening ring
кольцо жёсткости
astronaut.	stiffening ring (ГО)
construct.	stiffener ring
mech.	stiffening ring
nautic.	strengthening ring
O&G, oilfield.	reinforcing ring
pack.	corrugation vane; reinforcing strip
pulp.n.paper	heel ring
railw.	blanking ring
robot.	caulking ring
кольца жёсткости
mining.	stiffener rings (в гибких вентиляционных трубах)

кольцо жесткости: 14 phrases in 4 subjects

Makarov	3
Mechanic engineering	4
Technology	3
Transport	4