Starrett 52252 Mechanical Depth Micrometer 9 Inch 9 Rod

Product Description

The STARRETT 52252 is a mechanical depth micrometer designed for precise depth measurement in metalworking, machining, and mechanical trade applications. It delivers a 9-inch maximum measurement range using a set of 9 interchangeable rotating rods, each with a 5/32-inch (3.97 mm) diameter. Graduation is 0.001 inches with an accuracy rating of 0.0001 to 0.0002 inches, making it suitable for close-tolerance work. The 6-inch base length provides a stable reference surface across wide workpieces. A ratchet stop thimble ensures consistent measuring pressure on every reading, and a ring-type knurled lock nut secures the spindle quickly during measurement transfer.

This depth micrometer is used in machine shops, tool rooms, and production environments where accurate depth readings of bores, slots, steps, and counterbores are required. The 9-inch range and 9-rod configuration make it well suited for jobs that span a wide variety of depth increments without needing a separate gauge set. Licensed machinists, tool and die makers, and precision mechanics are the primary users. The unit ships with a protective case, keeping the rods and base organized and protecting calibrated surfaces during transport and storage.

Key Features

• 9-inch maximum measurement range with 9 interchangeable rotating rods
• 0.001-inch graduation for fine incremental readings
• Accuracy of 0.0001 to 0.0002 inches for close-tolerance applications
• 6-inch base length for stable contact across wide workpiece surfaces
• Ratchet stop thimble delivers repeatable, consistent measuring pressure
• Ring-type knurled lock nut allows quick and secure spindle locking
• Satin chrome finish reduces glare and resists corrosion

Compatibility

Designed as a standard mechanical depth micrometer replacement or addition for professional precision measurement setups requiring up to 9 inches of depth range.

Installation Notes

This instrument requires no installation but should be handled and stored by a qualified machinist or metrologist familiar with precision measuring tools. Before use, clean the base and rod contact surfaces and verify zero calibration against a known reference surface. Store the rods in the supplied case to prevent damage to measuring surfaces and maintain accuracy. Do not overtighten the lock nut or drop the instrument, as this can affect calibration.