Spi 14-654-8 Dial Drop Indicator 0.25in Range 0.001in Grad

Product Description

The SPI 14-654-8 is a dial drop indicator designed for precise linear measurement in machining, inspection, and quality control applications. It offers a 0.25-inch total measurement range with a graduation of 0.001 inches, allowing technicians to detect minute surface variation or runout with confidence. The dial diameter is 1.625 inches with a white face and a 1-100 dial reading scale. The housing is rigid forged brass, and the stem diameter is 0.375 inches. A revolution counter is built in, tracking each 0.1-inch-per-revolution cycle for clear reading during multi-revolution measurements. This indicator includes a Certificate of Calibration traceable to NPL.

This indicator suits dimensional inspection tasks on machine tools, surface plates, and fixture setups found in manufacturing, toolroom, and metrology environments. It is typically used by machinists, quality control technicians, and toolmakers to verify part flatness, runout, alignment, and surface consistency. The flat and lug back mounting options allow it to be secured to a wide variety of indicator holders and magnetic base arms without additional adapters.

Key Features

• 0.25-inch measurement range with 0.001-inch graduation for fine-resolution readings
• Revolution counter tracks cumulative travel at 0.1 inches per revolution
• Rigid forged brass housing for durability in shop environments
• 1.625-inch white dial face with 1-100 reading scale for clear visibility
• Flat and lug back mounting options included for versatile setup
• Tolerance pointers included for quick pass/fail visual reference
• Certificate of Calibration traceable to NPL included

Compatibility

Designed for use with standard AGD Group 2 indicator holders, magnetic bases, and surface plate stands that accept a 0.375-inch stem diameter. Meets AGD Group 2 and ASME B89.1.10M-2001 standards.

Installation Notes

Installation is performed by machinists or quality technicians using a compatible indicator holder or magnetic base. Secure the stem in the holder collet without overtightening to avoid restricting plunger travel. Ensure the workpiece and mounting surface are clean and free of burrs before zeroing the indicator. Power equipment should be off and workpieces should be stationary before taking readings.