Starrett 52244 Mechanical Depth Micrometer 3 in 3 Rod

Product Description

The STARRETT 52244 is a mechanical depth micrometer designed for precise depth measurement in machining, fabrication, and inspection applications. It delivers a 3-inch measurement range with a graduation of 0.001 inches and an accuracy of 0.0001 to 0.0002 inches. The ratchet stop thimble provides consistent measuring pressure across readings, while the ring-type knurled lock nut allows fast, secure locking once the measurement is set. The 6-inch base length ensures stable contact across wide workpiece surfaces. The satin chrome finish reduces glare under shop lighting and resists corrosion. Machinist, toolroom, and quality-control professionals use this instrument for depth, shoulder, slot, and recess measurements.

This depth micrometer suits production floor and toolroom environments where accurate depth measurement of bores, slots, counterbores, and stepped surfaces is required. Three interchangeable rotating rods with a 5/32-inch diameter extend the measuring range and allow the instrument to be configured for different depth intervals within the 3-inch range. The 6-inch base provides broad, flat contact across irregular or wide openings. It is appropriate for both job-shop and production-inspection use and comes packaged in a protective case for storage and transport.

Key Features

• 3-inch measuring range with 0.001-inch graduation for precise depth readings
• Accuracy of 0.0001 to 0.0002 inches across the full range
• Ratchet stop thimble delivers repeatable, consistent measuring pressure
• Ring-type knurled lock nut for quick and positive locking of the thimble position
• 6-inch base length for stable seating on wide workpiece surfaces
• Three rotating interchangeable rods included; satin chrome finish reduces glare

Compatibility

Designed as an OEM-style depth micrometer replacement or addition for standard mechanical depth measurement setups requiring a 3-inch range and 6-inch base. Also referenced under manufacturer part number 445DZ-3RL.

Installation Notes

Depth micrometers are set up and used by machinists, toolroom technicians, and quality-control inspectors. Before use, verify the base and measuring rod contact surfaces are clean and free of burrs or debris that could affect accuracy. Always lock the thimble with the ring lock nut before recording a measurement. Store the instrument in the supplied case to protect the measuring surfaces and maintain calibration.