RS PRO Internal Micrometer, Range 50 mm -250 mm, With UKAS Calibration Model No 1925902

RS PRO Internal Micrometer, Range 50 mm -250 mm, With UKAS Calibration Model No 1925902 is a precision measuring instrument used to measure the internal diameter of holes, cylinders, and other cylindrical features accurately. It is widely used in various industries, including machining, engineering, manufacturing, and quality control, where precise internal measurements are essential for ensuring the proper fit and function of components.

The main components of an internal micrometer include:

Measuring Head: The measuring head is the central part of the internal micrometer. It consists of a set of movable measuring anvils or contact points that expand or contract to fit the internal diameter being measured.

Micrometer Screw: The measuring head is connected to a micrometer screw, which moves the measuring anvils in and out when rotated. The micrometer screw has a calibrated scale that allows users to read the measurement directly in either metric (millimeters) or imperial (inches) units.

Thimble and Ratchet Stop: The micrometer screw is turned using a thimble, which is calibrated to allow for fine adjustments. A ratchet stop mechanism prevents over-tightening and ensures consistent measuring pressure, enhancing measurement accuracy.

Using an internal micrometer involves the following steps:

Preparing the Micrometer: The micrometer is first set to a zero or reference position by ensuring the measuring anvils are completely closed and the thimble is turned until it reads zero on the micrometer scale.

Inserting the Micrometer: The internal micrometer is carefully inserted into the hole or bore to be measured. The measuring anvils are expanded using the micrometer screw until they make contact with the internal surface.

Taking the Measurement: The micrometer reading is taken by reading the measurement value on the micrometer scale and the additional value on the thimble scale. This provides the accurate measurement of the internal diameter.

Internal micrometers come in various sizes and ranges to accommodate different bore diameters. Some models may include interchangeable measuring anvils to extend their versatility and adaptability to various applications.

In conclusion, an internal micrometer is a precise and reliable tool used for measuring internal diameters in cylindrical features. Its ability to provide accurate measurements of holes, cylinders, and bores ensures proper fits and tolerances in various industrial applications. With careful handling and proper calibration, internal micrometers contribute to maintaining high-quality standards and efficient manufacturing processes.