Starrett 56143 Interchangeable Rod Micrometer 200-800mm

Product Description

The STARRETT 56143 is a mechanical interchangeable rod micrometer designed for internal diameter and depth measurements across a wide range of 200 to 800mm. It features a friction thimble for consistent measuring pressure and delivers a graduation of 0.01mm with an accuracy of 0.003mm at 25mm. The set includes 4 interchangeable extension rods, allowing technicians and machinists to build up measurement ranges in 25mm and 50mm increments without switching instruments. Quick-reading figures on the thimble reduce eye strain during repeated measurements. This micrometer is suited for precision metrology work in machine shops, manufacturing facilities, and inspection departments.

The STARRETT 56143 is used in applications requiring accurate large-bore or deep-reach internal measurements. With a 25mm travel per rod and four rods included, the usable range spans from 200 to 800mm in a single kit. It is appropriate for dimensional inspection of bores, housings, cylinders, and similar features in industrial and manufacturing environments. Professional machinists, metrologists, and quality control technicians are the primary users of this instrument.

Key Features

• Measurement range of 200 to 800mm using four interchangeable extension rods
• 0.01mm graduation for fine-resolution readings
• Accuracy of 0.003mm at 25mm for reliable dimensional inspection
• Friction thimble provides consistent, repeatable measuring force
• Quick-reading figures on thimble scale for faster readings
• Rod diameter of 6mm (approximately 0.25 inches) with 25mm and 50mm spacing collar lengths

Compatibility

Designed as an OEM-style precision measuring instrument compatible with standard interchangeable rod micrometer accessories and extension rods matching 6mm rod diameter with 25mm and 50mm collar spacing increments.

Installation Notes

This instrument is used by qualified machinists and metrology technicians in controlled measurement environments. Before use, verify that all extension rods are fully seated and locked to prevent measurement error. Store the micrometer in its case when not in use to protect the precision ground surfaces. Follow the manufacturer calibration schedule and handle the spindle and thimble carefully to maintain accuracy over time.