Spi 11-571-7 Mechanical Depth Micrometer 100 Mm 4 Rods

Product Description

The SPI 11-571-7 is a mechanical depth micrometer designed for precision depth measurement in machining, metalworking, and inspection applications. It covers a measurement range of 100 mm using a set of four interchangeable rotating rods, each with a diameter of 4.50 mm (0.176 inches). The ratchet stop thimble ensures consistent measuring force across readings, reducing operator-to-operator variation. Graduation is 0.01 mm with an accuracy of 0.004 mm, making it suitable for close-tolerance work. The 63 mm base length provides stable seating on workpiece surfaces. The unit ships NIST-certified and includes a short-form certificate of calibration.

This depth micrometer is used in machine shops, toolrooms, and quality-control environments where accurate depth readings are required for bores, slots, steps, and shoulders. The four-rod set allows the tool to be configured across the full 100 mm range without additional accessories. It is appropriate for both production-floor use and bench inspection setups. A torque wrench and fitted case are included, supporting organized storage and proper handling during rod changes.

Key Features

• 100 mm measurement range via four interchangeable rotating rods
• 0.01 mm graduation with 0.004 mm accuracy
• Ratchet stop thimble for consistent, repeatable measuring force
• 63 mm base length for stable contact on flat reference surfaces
• 4.50 mm rod diameter (0.176 inches) on all four rods
• NIST-certified calibration with short-form certificate of traceability included
• Includes fitted case and torque wrench for rod changes

Compatibility

Designed as a general-purpose mechanical depth micrometer for use in standard machining and inspection environments. The four-rod configuration covers the full 100 mm range without additional rod sets.

Installation Notes

Depth micrometers are installed and used by machinists, tool-and-die makers, and quality-control technicians. Before use, verify the anvil face and base are clean and free of chips or burrs that could affect the zero reference. Use the included torque wrench when swapping rods to avoid damaging the spindle thread. Store in the provided case when not in use to protect the calibrated surfaces and maintain the NIST traceability of the instrument.