Starrett 56142 Inside Micrometer Set 300 Mm 10 Rods

Product Description

The STARRETT 56142 is a mechanical inside micrometer set designed for precise internal bore and diameter measurements in machining, maintenance, and inspection applications. The set covers a measurement range of 50 mm to 300 mm using ten solid extension rods, each marked with its length for fast identification. A friction thimble provides consistent measuring force to protect accuracy and reduce operator error. Graduation is 0.01 mm with an accuracy of 0.003 mm per 25 mm of range. Anvils are hardened and ground for durability. Extension rods are insulated to minimize thermal transfer from the technician's hands. Quick-reading figures aid efficient measurement in production or field environments.

This inside micrometer set is suited for machine shops, industrial maintenance facilities, and quality control departments where accurate internal measurements are required across a wide range of bore sizes. It is appropriate for measuring cylinder bores, housings, sleeves, and similar internal features in both light manufacturing and heavy-duty industrial settings. Machinists, toolmakers, and metrology technicians are the primary users. The included case keeps all components organized and protected when not in use.

Key Features

• Measurement range of 50 mm to 300 mm using ten solid extension rods
• 0.01 mm graduation with 0.003 mm accuracy per 25 mm of range
• Friction thimble provides repeatable, controlled measuring force
• Hardened and ground anvils for long-term wear resistance
• Insulated rods marked with length for quick selection and reduced thermal error
• Quick-reading figures for efficient use in production environments
• Includes protective carrying case for storage and transport

Compatibility

Designed as a general-purpose inside micrometer set suitable for standard metric internal measurement applications in machining and inspection environments.

Installation Notes

Inside micrometers are installed and removed by hand without tools. Before use, ensure the measuring faces and extension rod contact points are clean and free of debris. Zero and calibrate the instrument according to the manufacturer procedure before taking critical measurements. Store extension rods in the provided case to prevent damage to contact surfaces.