Starrett 52173 Mechanical Depth Micrometer 6 Inch 6 Rod

Product Description

The STARRETT 52173 is a mechanical depth micrometer designed for precise depth measurements in machining, fabrication, and inspection work. It covers a full 6-inch measurement range using a set of 6 interchangeable rotating rods, each with a 5/32-inch (3.97 mm) diameter. The thimble uses a ratchet stop mechanism for consistent measuring pressure, and the ring-type knurled lock nut holds readings securely once a measurement is taken. Graduation is 0.001 inches, with an accuracy rating of 0.0001 to 0.0002 inches, making it suitable for close-tolerance work. The satin chrome finish reduces glare under shop lighting. Machinists, toolmakers, and quality-control technicians are the primary users.

The 52173 is suited for measuring the depth of slots, bores, counterbores, steps, and recesses on workpieces in both job-shop and production environments. The 2-inch base length provides a stable reference surface across a range of workpiece geometries. Each of the 6 rods extends the range in 1-inch increments, allowing continuous coverage from 0 to 6 inches without resetting a datum. This instrument is used wherever a standard blade-type depth gauge lacks the resolution or repeatability required by the application.

Key Features

• 6-inch total measurement range via 6 interchangeable rotating rods
• Ratchet stop thimble ensures consistent, repeatable measuring force
• Ring-type knurled lock nut allows quick and secure reading lock
• 0.001-inch graduation with 0.0001 to 0.0002-inch accuracy
• 2-inch base length for stable contact on workpiece surfaces
• Satin chrome finish minimizes glare in typical shop lighting
• Includes a protective carrying case

Compatibility

Designed as a standard mechanical depth micrometer for general metrology and machining applications. No specific system or equipment compatibility is stated by the manufacturer for this instrument.

Installation Notes

Depth micrometers require no installation but should be handled and stored by trained metrology or machinist personnel. Zero the instrument against a known flat reference surface before use and verify calibration with a gage block if high accuracy is required. Clean the base and rod contact surfaces before each use to prevent debris from affecting readings. Store the instrument in the included case when not in use to protect the measuring faces and rod threads.