Mitutoyo 4887A-19 Dial Drop Indicator 3in 0.001in Grad

Product Description

The MITUTOYO 4887A-19 is a dial drop indicator designed for precision dimensional measurement in metrology, machining, and quality control applications. It provides a 3-inch total measurement range with a 0.001-inch graduation, allowing technicians to detect and record small surface variations and runout with repeatable accuracy. The jeweled bearing construction reduces friction and wear, contributing to long-term measurement consistency. A built-in revolution counter tracks full spindle rotations across the 3-inch range, and the shockproof design adds durability in shop-floor environments. Licensed metrology technicians, machinists, and quality inspectors are the primary users of this instrument.

The 4887A-19 is suited for use in precision inspection setups, surface plate work, fixture verification, and machine tool alignment. The lug back mount allows secure attachment to magnetic bases, transfer stands, and indicator holders commonly used in both shop and lab settings. The 3-5/8-inch white dial face with a 0-100 reading scale provides clear readability under typical shop lighting. This indicator conforms to ANSI/AGD standards and falls within AGD Group 4, making it appropriate for applications requiring standardized gage interchangeability.

Key Features

• 3-inch measurement range with 0.001-inch graduation for fine-resolution readings
• Jeweled bearing construction for reduced friction and extended service life
• Revolution counter for tracking cumulative travel across the full 3-inch range
• Shockproof design for durability in production and shop-floor environments
• Lug back mount compatible with standard indicator holders and magnetic bases
• Meets ANSI/AGD standards, AGD Group 4 classification

Compatibility

Designed as an ANSI/AGD Group 4 drop indicator compatible with standard lug back indicator holders, magnetic bases, and transfer stands used in precision measurement setups.

Installation Notes

Installation is typically performed by machinists or metrology technicians using a compatible indicator holder and mounting arm. Ensure the lug back is fully seated and clamped before taking measurements. The spindle should move freely without side load to maintain accuracy. Handle the instrument carefully and avoid dropping, as impact damage can affect calibration even in shockproof models.