Starrett 56144 Inside Micrometer Set 800mm 10 Rods

Product Description

The STARRETT 56144 is a mechanical inside micrometer set covering a measurement range of 50 mm to 800 mm, designed for precision internal bore and diameter measurement in industrial and trade applications. The set includes two heads and ten solid extension rods, each insulated and marked with their length for fast identification in the field. A friction thimble provides consistent measuring force to protect workpiece finish and repeatable readings. Graduation is 0.01 mm with an accuracy of 0.003 mm per 25 mm of travel. Hardened and ground anvils extend service life under regular shop use. Licensed metrology technicians, machinists, and precision maintenance trades rely on this instrument for bore gauging and close-tolerance fitting work.

The 56144 is suited for measuring inside diameters, bores, and internal distances across a wide range of industrial components. With two heads and ten extension rods, the set spans 50 mm up to 800 mm without switching instruments, making it practical for both small-bore and large-bore work on equipment such as pump housings, engine blocks, cylinders, and structural assemblies. The quick-reading figure markings and insulated rods reduce setup time during repetitive measurement tasks. The included case keeps rods organized and protects the heads during storage and transport.

Key Features

• Measurement range of 50 mm to 800 mm using two heads and ten solid extension rods
• 0.01 mm graduation with 0.003 mm accuracy per 25 mm travel
• Friction thimble ensures consistent measuring force and repeatable readings
• Hardened and ground anvils resist wear under continuous shop use
• Insulated extension rods marked with length for quick identification
• Quick-reading figures reduce time during repetitive measurement tasks
• Includes protective case for storage and field transport

Compatibility

Designed as a general-purpose inside micrometer set for industrial metrology, machine shop, and precision maintenance applications requiring internal diameter measurement from 50 mm to 800 mm.

Installation Notes

Inside micrometers are installed and used by machinists, metrology technicians, and precision maintenance trades. Before measuring, verify that the anvil faces and bore surfaces are clean and free of burrs or debris that could affect accuracy. Rod extensions should be threaded together firmly by hand without the use of tools to avoid damage to the threads. Store rods in the provided case when not in use to prevent corrosion and physical damage to the contact surfaces.