Description
M45 × 1.5 is a metric thread designation:
M45 = 45 mm nominal major diameter
1.5 = 1.5 mm thread pitch (distance between threads)
This is a fine-pitch metric thread, since the standard coarse pitch for M45 is 4.5 mm.
Common reference dimensions for M45 × 1.5:
Major diameter: 45.00 mm
Pitch: 1.50 mm
Approximate tap drill size: 43.5 mm (nominal) for internal threads
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