Starrett 53388 Dial Drop Indicator 0-0.125 in Lug Back

Product Description

The STARRETT 53388 is a dial drop indicator designed for precise surface and positional measurements in machining, inspection, and alignment work. It covers a measurement range of 0 to 0.125 inches with a dial graduation of 0.0005 inches, giving technicians fine resolution for detecting runout, flatness deviation, and part-to-part variation. The 0-25-0 bidirectional dial reading allows deflection to be read in either direction from zero. A revolution counter tracks full spindle cycles, and the 1-11/16 inch diameter white dial with no-glare satin finish keeps readings legible under shop lighting. The unbreakable crystal and stainless steel stem add durability in production environments.

This indicator suits toolroom, machine shop, and quality-control applications where short-range, high-resolution drop measurement is required. The lug back mounts to standard indicator holders and magnetic bases. A flat back is included for surface-plate and bench-block setups. Typical users include machinists, metrology technicians, and precision-equipment mechanics working on mills, lathes, surface grinders, and CMM fixturing. The 0.05 inches per revolution travel keeps the indicator sensitive to small displacements across its full 0.125 inch range.

Key Features

• 0 to 0.125 inch measurement range with 0.0005 inch graduation for high-resolution readings
• 0-25-0 bidirectional dial reading with revolution counter for multi-cycle tracking
• Jeweled bearing for smooth, repeatable spindle travel and long service life
• No-glare satin finish on 1-11/16 inch white dial for clear reading in shop conditions
• Unbreakable crystal and stainless steel stem for durability in production use
• Lug back included; flat back also included for versatile mounting options

Compatibility

Designed as a standard AGD Group 1 dial drop indicator compatible with conventional lug-back indicator holders, magnetic bases, and surface-plate stands accepting a 0.375 inch stem diameter.

Installation Notes

Mounting and use does not require electrical isolation, but the indicator should be secured in a rigid holder or magnetic base to prevent false readings from vibration or fixture movement. Ensure the spindle axis is perpendicular to the measured surface for accurate results. Do not force the spindle beyond its stated range. Calibration checks against a known reference gauge block are recommended before critical inspection work.