If a bolt is manufactured with left-handed threads, the corresponding nut must feature_____________________?
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Answer: B. left hand with same pitch
Explanation
Left-handed threaded bolts require a matching nut featuring identical left-handed internal threads. The thread pitch of both components must match perfectly to allow smooth assembly engagement. Mating right-hand threads would physically prevent engagement with a left-hand threaded bolt. Thread chirality determines whether a fastener tightens clockwise or counter-clockwise during rotation. Left-handed threads are designed to self-tighten under specific counter-clockwise rotational operating loads. Thread pitch measures the linear distance between adjacent threads along the fastener axis.
Turnbuckles use opposing left and right hand threads to adjust cable tension efficiently. Left-hand threads are used on rotating equipment where standard right-hand nuts would loosen. Gas cylinder connections often employ left-hand threads to prevent dangerous cross-gas hookups. Right-hand nuts cannot assemble onto left-hand bolts due to conflicting helical groove angles. Fine pitch requirements depend on specific design needs rather than altering thread chirality. Mixing different thread directions renders mechanical fastening completely impossible in practice.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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