A bolt thread specification labeled as M 33 x 2 indicates that___________________?
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Answer: C. metric threads of 33 mm outside diameter and 2 mm pitch
Explanation
The letter M designates a metric thread standard for threaded mechanical fasteners. The number 33 specifies the nominal major outside diameter of the bolt in millimeters. The number 2 indicates the linear distance between adjacent thread peaks known as the pitch. Standardized thread designations provide clear specifications for manufacturing and interchangeability worldwide. Nominal diameter represents the outer boundary dimension of male external screw threads. Thread pitch defines the axial distance traveled by a fastener during one complete revolution.
Mechanical engineers read thread callouts to select appropriate bolts and matching tapped holes. Correct thread specification prevents assembly errors and ensures structural integrity in bolted joints. Standardized metric fastenings are used extensively in global automotive and manufacturing industries. Metric thread designations specify millimeter dimensions rather than counting thread quantities per centimeter. Cross-section area alone does not define the precise diameter and pitch parameters of threads. Older imperial thread standards use counts per inch rather than metric pitch measurements.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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