1. Diameter: Common diameters include M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, etc., in millimeters.
2. Thread pitch: threaded rods with different diameters usually correspond to different pitches. For example, the pitch of M3 is usually 0.5 millimeters, M4 is usually 0.7 millimet...
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