Starrett 445BZ-3RL Micrometer Depth Gage 0-3" Range with 4" Base

The Starrett 445BZ-3RL is a precision micrometer depth gage designed for accurate depth, step, and shoulder measurements in machining, toolmaking, and quality control applications. Built to the exacting standards Starrett is renowned for, this gage features a 0–3 inch measuring range paired with a 4-inch base for stable, repeatable readings across a wide surface area.

Key Features:

• Measuring Range: 0–3 inches
• Base Length: 4 inches for enhanced stability and contact surface
• Thimble: Satin-chrome finish for reduced glare and comfortable handling
• Ratchet Stop (RL): Built-in ratchet stop ensures consistent, controlled measuring pressure for repeatable results
• Locknut: Convenient locknut to secure measurements during transfer
• Graduated Sleeve: Clear, easy-to-read graduations in 0.001" increments
• Carbide-tipped spindle: For extended wear resistance and long service life
• Heat-treated steel construction: Corrosion-resistant with a hardened and ground measuring surface

The "BZ" designation indicates a satin-chrome (bright) finish on the thimble and barrel, reducing reflection for improved readability under shop lighting. The ratchet stop ("RL") provides uniform measuring force, eliminating operator-to-operator variation and ensuring accurate, consistent depth readings every time.

Ideal for use in tool rooms, machine shops, and inspection departments, the Starrett 445BZ-3RL is a trusted choice for professionals who demand precision and durability in their depth measurement instruments.