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shear pin
Definição1
A pin used to protect a piece of equipment by intentionally shearing if the equipment should seize. A shear pin is used in the drive shaft of some engine-driven pumps. If the pump should seize, the shear pin will break and allow the shaft to turn, but the pump is protected from further damage.
Fonte1
CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Fonte2
ARAÚJO, João Richard Barcelos. Inglês técnico: técnicos em manutenção de aeronaves. [S.l]: [s.n.], [200-]. 100 p.
Subárea1
Engine
Português
pino de cisalhamento
Imagem

 A sailor checks the outside diameter of a shear pin in the machinery repair shop aboard the Nimitz-class aircraft carrier USS John C. Stennis.

A sailor checks the outside diameter of a shear pin in the machinery repair shop aboard the Nimitz-class aircraft carrier USS John C. Stennis.

Fonte: http://en.wikipedia.org/wiki/File:Sailor-Texas_native_works_in_repair_shop_aboard_USS_John_C._Stennis.jpg