Spi 14-653-0 Dial Drop Indicator 0.25in Range

Product Description

The SPI 14-653-0 is a dial drop indicator designed for precision dimensional measurement in machining, tooling, and metrology applications. It delivers a 0.25-inch total range with a 0.001-inch graduation and a 0-50-0 dial reading, making it suitable for comparative measurements, runout checks, and surface flatness verification. The housing is rigid forged brass, and the indicator includes a built-in revolution counter to track full-travel cycles. A Certificate of Calibration Traceable to NPL is included, confirming measurement accuracy at the time of shipment. Machinists, quality control technicians, and toolroom professionals are the primary installers and users of this instrument.

This indicator is suited for use on inspection fixtures, surface plates, magnetic bases, and transfer setups in both production and toolroom environments. The 0.001-inch graduation supports general-tolerance dimensional checks across a wide range of workpiece types. The flat and lug back mounting options provide flexibility for a variety of fixture and arm configurations. The 1.5-inch dial diameter allows for clear reading at typical bench working distances.

Key Features

• 0.25-inch measurement range with 0.001-inch graduation for precise comparative measurement
• 0-50-0 bidirectional dial reading for positive and negative deviation tracking
• Built-in revolution counter tracks full-travel cycles during measurement
• Rigid forged brass housing for durability in shop environments
• Dual mounting options: flat back and lug back for fixture versatility
• Includes Certificate of Calibration Traceable to NPL and tolerance pointers
• Meets AGD Group 2 and ASME B89.1.10M-2001 standards

Compatibility

Designed for use with standard AGD Group 2 dial indicator holders, magnetic bases, and fixtures accepting a 0.375-inch stem diameter and a No. 4-48 thread contact point.

Installation Notes

Mounting and setup should be performed by a qualified machinist or metrology technician familiar with AGD indicator fixtures. Ensure the indicator stem is clamped securely without side-loading, which can affect measurement accuracy. Zero the dial at the reference surface before taking comparative readings. Contact points should be inspected and confirmed thread-compatible before attachment.