What Are the Dimensions of a 6.35 mm x 12 mm Shaft Coupling?

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A coupling described as 6.35 mm x 12 mm indicates that the 6.35 mm measurement is the inner diameter (ID) for the shaft it accepts, corresponding to a 1/4" shaft. The 12 mm measurement typically refers to the outer diameter (OD) of the coupling. The dimensions can vary based on the coupling type, which may affect how they connect to opposing shafts. Understanding these dimensions is crucial for ensuring compatibility in mechanical applications. Accurate identification of ID and OD is essential for proper coupling selection.
LickMyEyeball
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When a coupling is described as being 6.35 mm x 12 mm, what does this mean?

I figure that 6.35 mm is the shaft diameter it accepts because that diameter equals 1/4". Is 12 mm the size of shaft the opposing side is designed to attach to?

Thank you in advance.
 
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