Definition
A specified amount of rotational force, measured in units such as foot-pounds or inch-pounds, that must be applied when tightening a fastener (such as a bolt, nut, or spark plug) to ensure it is secured correctly — neither too loose nor too tight.
Plain English
The exact tightness, given as a number, that a bolt or nut must be turned to so it holds properly without being damaged or working loose.
Context Anchor
Seen in aircraft maintenance instructions, shop practice, preflight discussions about secured parts, and instructor demonstrations of correct mechanical procedures.
Derivation
‘Torque’ comes from the Latin torquere, meaning ‘to twist.’ A torque value is simply a measured amount of twisting force — how hard you are turning the wrench.
Why Pilots Care
Correct torque values prevent loose parts, structural failure, or component damage that could compromise flight safety.
Intuition Check
Do not assume torque value means “as tight as it feels by hand.” In aviation, it means a specific measured amount of twisting force, normally taken from approved maintenance information.
Example Sentence 1
The mechanic tightened each cylinder bolt to the torque value listed in the engine manual.
Example Sentence 2
After replacing the propeller, the technician double-checked each torque value against the maintenance manual.