An engineer selects an M8 screw for assembling two steel plates. Which value indicates the nominal diameter in the specification M8 x 1.25 x 40?
8 mm
To determine which value indicates the nominal diameter in the specification M8 x 1.25 x 40, we need to understand the meaning of the designation itself. Let's break down each part:
- M: Indicates that the screw thread follows the ISO metric thread standard.
- 8: This number is the nominal diameter of the screw in millimeters. Therefore, the nominal diameter in this specification is 8 mm.
- 1.25: Represents the pitch of the thread, which is the distance between two adjacent threads. This is measured in millimeters.
- 40: Indicates the length of the screw. The screw's full length is 40 millimeters.
Given this breakdown, the value that represents the nominal diameter is clearly 8 mm. Let's analyze each option:
- \(1.25 \, \text{mm}\): This is the thread pitch and not the nominal diameter.
- \(40 \, \text{mm}\): This is the length of the screw.
- \(8 \, \text{mm}\): This is the correct value for the nominal diameter.
- \(16 \, \text{mm}\): This value is not part of the specification provided.
Thus, the correct answer is the nominal diameter of the screw, which is \(8 \, \text{mm}\).
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