Starrett 260Z Groove Micrometer 0.001" Graduation 0.050-1.050" Range

The Starrett 260Z Groove Micrometer is a precision mechanical measuring instrument designed to quickly and accurately measure the widths of internal and external grooves and lands. Built to the exacting standards Starrett has maintained since 1880, this tool is ideal for machinists, toolmakers, and quality control professionals who require reliable groove measurement in demanding shop environments.

Key Specifications:

• Graduation: .001"
• Accuracy: ±0.0004"
• Groove Width Range: .050" – 1.050" (1.27 – 26.6 mm)
• Land Width Range: 0 – 1.000" (0 – 25 mm)
• Maximum Hole Depth: 1-5/8" (41 mm)
• Measuring Disc Diameter: 9/32" (7 mm)
• Measuring Disc Thickness: .025" (0.63 mm)
• Anvil / Spindle Type: Disk
• Thimble Type: Speeder
• Body Material: Steel with satin chrome finish
• Overall Dimensions: 39/64" dia × 5-13/16" L

Features:

• Satin chrome finish resists glare and corrosion for long tool life
• Advanced sleeve design with staggered lines and distinct figures for precise, easy readability
• Quick-reading figures — every thousandth numbered on inch tools
• Balanced ergonomic design for easy single-hand handling
• Extremely hard, stable one-piece spindle for consistent accuracy
• Hardened, ground, and lapped measuring discs for wear resistance
• Quick and easy thimble adjustment via speeder mechanism

The Starrett 260Z includes a fitted storage case to protect the instrument when not in use. The MPN for this model is 260Z, part of the Starrett 260 series groove micrometer line. Also known as a disc micrometer or groove width micrometer, this tool is an essential addition to any precision measurement toolkit.