Starrett 440Z-3RL Micrometer Depth Gage 0-3" Range 2-1/2" Base with Ratchet Stop

The Starrett 440Z-3RL is a precision mechanical micrometer depth gage designed for accurate measurement of holes, slots, shoulders, and projections. Part of Starrett's trusted Series 440, this depth gage delivers reliable readings to .001" graduation with a micrometer head accuracy of +/- .0001" and rod accuracy of +/- .0002". Made in the USA, it's built to meet the demands of professional machinists and quality control applications.

Key Features:

• Measuring Range: 0–3" with .001" graduation and resolution
• Base: 2-1/2" (63.5mm) hardened, ground, and lapped for accuracy and durability
• Includes 3 interchangeable measuring rods — 1/8" (3.2mm) diameter — covering the full 0–3" range in 1" increments
• Combination ratchet and speeder thimble for uniform measuring pressure and faster adjustment
• Ring-type knurled lock nut for quick and secure locking of measurements
• Satin chrome finish reduces glare during use
• Flat anvil and flat spindle design
• EDP# 52115

What's Included:

• Depth micrometer head with 2-1/2" base
• 3 interchangeable measuring rods (0–1", 1–2", 2–3" ranges)
• Ratchet stop and lock nut
• Fitted protective case

The Starrett 440Z-3RL depth micrometer is an ideal choice for machinists, toolmakers, and quality inspectors who require accurate, repeatable depth measurements in a compact, professional-grade instrument.