Starrett 53312 Dial Drop Indicator 0-5 in 0.001 Grad

Product Description

The STARRETT 53312 is a dial drop indicator designed for precise linear measurement in shop, field, and maintenance applications. It covers a 0 to 5 inch measurement range with 0.001 inch graduations and a 0-100 dial reading scale, providing resolution suitable for dimensional inspection, runout checks, and surface comparison work. The 2-1/4 inch white dial face carries a no-glare satin finish and is protected by an unbreakable crystal. Jeweled bearings support smooth, repeatable spindle movement. The stainless steel stem measures 0.375 inches in diameter and 4.8125 inches in length. A built-in revolution counter tracks full-range travel across the 0.1 inch per revolution mechanism. The unit ships with both a lug back and a flat back included.

This indicator is used in precision measurement tasks across machine shops, tool rooms, HVAC equipment alignment, and industrial maintenance. Its 5-inch range makes it well suited for applications requiring extended travel beyond the typical 1-inch short-range indicator, such as checking shaft runout on large rotating equipment, verifying flatness across long surfaces, or inspecting deep bore dimensions. Machinists, millwrights, and maintenance technicians are the primary installers and users of this instrument.

Key Features

• 0 to 5 inch measurement range with 0.001 inch graduation for high-resolution readings
• Jeweled bearing mechanism for smooth, accurate spindle travel
• 0.1 inch per revolution with built-in revolution counter for full-range tracking
• No-glare satin finish white dial with unbreakable crystal lens
• Stainless steel stem, 0.375 inches in diameter and 4.8125 inches in length
• Includes both lug back and flat back for flexible mounting options

Compatibility

Designed as an OEM-style drop indicator compatible with standard 0.375 inch stem clamps, dial indicator holders, magnetic bases, and surface gauge arms used in general metrology and precision measurement setups.

Installation Notes

Mount using a dial indicator holder or magnetic base that accepts a 0.375 inch stem diameter. Ensure the spindle axis is perpendicular to the measured surface to avoid cosine error in readings. Do not exceed the stated 5 inch travel range, as forcing the spindle beyond its limit can damage the internal mechanism. No electrical connections or power sources are required for this instrument.