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left-hand thread
mater.sc., mech.eng.	rosca a izquierdas
mech.eng.	roscado a izquierdas
pack.	filete hacia la izquierda
left hand thread
mater.sc., mech.eng.	rosca a izquierdas
mech.eng.	roscado a izquierdas
transp., mater.sc.	tornillo de rosca a la derecha

left-hand thread: 5 phrases in 2 subjects

Materials science	1
Mechanic engineering	4