Which micrometer type includes a stopping plate?

Which micrometer type includes a stopping plate?

• A. Depth micrometer
• B. Outside micrometer
• C. Inside micrometer
• D. Vernier micrometer

Answer: (A)

Depth measurement relies on a reference stop that sits on the workpiece surface to define the zero plane. The stopping plate on a depth micrometer is a flat contact surface at the end of the measuring stem that rests on the top surface, so the spindle can extend into the hole without pushing past the surface. This plate ensures the measurement starts from the surface itself and prevents bottoming out, giving a consistent depth reading from the surface down to the bottom of the feature. Other micrometers measure external or internal dimensions and use their respective contact faces (anvils and spindle) to establish measurement without a stopping plate, so they don’t include this feature.

Depth measurement relies on a reference stop that sits on the workpiece surface to define the zero plane. The stopping plate on a depth micrometer is a flat contact surface at the end of the measuring stem that rests on the top surface, so the spindle can extend into the hole without pushing past the surface. This plate ensures the measurement starts from the surface itself and prevents bottoming out, giving a consistent depth reading from the surface down to the bottom of the feature. Other micrometers measure external or internal dimensions and use their respective contact faces (anvils and spindle) to establish measurement without a stopping plate, so they don’t include this feature.