Micrometer INSIZE 75–100 mm standard measuring tool model 3202-100A

Micrometer INSIZE 75–100 mm standard measuring tool model 3202-100A is an analog external micrometer intended for precise measurement of thicknesses and diameters in the 75–100 mm range. The instrument features a calibrated spindle, a thimble scale and a ratchet stop to help achieve consistent closing force and repeatable readings. Its mechanical construction and conventional scale make it suitable for workshop and inspection environments where robust, maintenance‑friendly measurement tools are required.

Advantages

The INSIZE micrometer gives reliable mechanical accuracy without the need for batteries or electronic components, ensuring long service life and straightforward maintenance. The calibrated spindle and clear thimble graduation enable direct readout of measurements with standard micrometer precision. The ratchet stop provides controlled measuring force to reduce operator variation and protect the spindle and workpiece from excessive pressure. The frame and anvil are designed for stable contact and consistent positioning during external measurements.

Suitable for

• Measuring external diameters of shafts, rods and cylindrical parts
• Measuring thickness of flat parts, plates and fabricated components
• Quality control and inspection tasks in workshops and production lines
• General mechanical and metalworking measurement needs where 75–100 mm range is required

Key specifications

• Measuring range: 75–100 mm
• Type: analog external micrometer
• Readout: thimble scale with calibrated spindle
• Measuring faces: hardened anvil and spindle for wear resistance
• Closing mechanism: ratchet stop for consistent measuring pressure
• Construction: rigid frame suitable for workshop use

How to use

Place the workpiece between the anvil and spindle, then advance the spindle using the thimble until light contact is made. Use the ratchet stop to apply consistent closure force; the ratchet will slip when the correct pressure is reached. Read the value from the thimble and sleeve scales according to standard micrometer reading procedure. When finished, retract the spindle to avoid unnecessary contact and store the micrometer in a protective case to preserve calibration and prevent damage.

Usage recommendations

Ensure the measuring faces are clean and free of debris before each measurement, and allow the instrument and workpiece to reach the same ambient temperature to reduce thermal error. Periodically check calibration against gauge blocks or a master standard and avoid applying excessive torque to the thimble to maintain accuracy.