Starrett 52115 Mechanical Depth Micrometer 3 Inch 3 Rods

Product Description

The STARRETT 52115 is a mechanical depth micrometer designed for precise depth measurement in machining, manufacturing, and inspection applications. It delivers a 3-inch measurement range across three interchangeable rods, with a graduation of 0.001 inches and an accuracy of 0.0001 to 0.0002 inches. The 2.5-inch base length provides a stable reference surface, and the ratchet stop thimble ensures consistent measuring force on every reading. A ring-type knurled lock nut allows quick, secure thimble locking once the measurement is set. This tool is used by machinists, quality technicians, and precision fabricators who require reliable hand-tool measurement on the shop floor or inspection bench.

The 52115 is suited for depth measurement of slots, holes, counterbores, and stepped surfaces in both production and inspection environments. The rotating rod design allows fast changeover between the three included rods without disturbing the base setup. With a rod diameter of 0.125 inches and a base length of 2.5 inches, it fits common workholding and fixturing scenarios encountered in general machining and toolroom work. The included case keeps rods organized and protects the measuring surfaces during storage and transport.

Key Features

• 3-inch measurement range with 0.001-inch graduation for fine depth readings
• Accuracy rated at 0.0001 to 0.0002 inches for precision inspection use
• Ratchet stop thimble delivers repeatable, consistent measuring force
• Ring-type knurled lock nut allows quick and secure locking of the thimble position
• Three interchangeable rotating rods extend measurement versatility
• 2.5-inch base length provides a stable seating surface on the workpiece

Compatibility

Designed as an OEM-style depth micrometer for general machining, toolroom, and inspection bench applications requiring mechanical depth measurement up to 3 inches.

Installation Notes

Depth micrometers are installed and operated by machinists and quality technicians and require no permanent mounting. Before use, verify the reference surfaces and rod ends are clean and free of debris to prevent measurement error. Store the instrument in the included case when not in use to protect the measuring surfaces and rod threads. Calibrate or verify the zero setting per shop metrology procedures before beginning a measurement sequence.