A screw thread is specified as M12 × 1.75. What does 'M12' represent in this specification?
Major diameter of twelve millimeters
The specification of the screw thread is given as "M12 × 1.75". This signifies the dimensions and characteristics of a metric thread. Each part of this specification has a specific meaning:
- M: Stands for metric thread. This indicates that the thread profile follows the ISO metric screw threads standard, which is commonly used worldwide.
- 12: Represents the major diameter of the thread in millimeters. Hence, "M12" means that the major diameter of the screw thread is 12 millimeters.
- 1.75: Represents the pitch of the thread. The pitch is the distance between two consecutive thread peaks and is measured in millimeters.
Therefore, in "M12 × 1.75", 'M12' clearly indicates that the major diameter of the screw thread is 12 millimeters. This is a standardized method to specify screw threads in the metric system, helping in the selection and matching of nuts and bolts during assembly or manufacturing.
The correct answer to the question is:
- Major diameter of twelve millimeters
Other options explained:
- Thread angle of twelve degrees: This is incorrect because the 'M12' part of the specification does not refer to the angle of the threads.
- Minor diameter of twelve millimeters: This is incorrect. The minor diameter is usually not specified in this way in the standard notation.
- Pitch of twelve millimeters: This is incorrect. The pitch is given as 1.75 mm in this specification, not 12 mm.
Conclusion: 'M12' in the specification M12 × 1.75 refers to the major diameter of twelve millimeters, which is crucial for determining the size of the screw and matching it with the appropriate nut or receiving thread.
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