Starrett 64885 Drop Indicator Split Collet M12 X 1.75

Product Description

The STARRETT 64885 is a drop indicator split collet designed to mount and secure AGD-style indicators in inspection and measurement setups. Machined from steel for rigidity and durability, this collet accepts an 8.00 mm inside diameter and features an M12 x 1.75 threaded shank with a 7 mm thread length. It is used by machinists, metrologists, and precision measurement technicians to attach dial drop indicators to indicator holders, magnetic bases, transfer gages, and similar fixturing systems. The split collet design allows tool-free or minimal-tool clamping of the indicator stem, keeping the indicator firmly positioned during use.

This split collet is suited for use in machine shops, quality control labs, and on the shop floor where AGD dial indicators need to be mounted to standard indicator holders or arms. It fits applications in surface plate inspection, fixture checking, runout measurement, and bore alignment tasks where a secure, repeatable indicator mount is required. It is sold individually as a single unit.

Key Features

• Steel construction for rigidity and long service life under shop conditions
• Split collet design provides secure clamping of indicator stems without marring
• M12 x 1.75 threaded shank for compatibility with standard indicator holders
• 8.00 mm inside diameter sized for AGD-standard indicator stems
• 7 mm thread length for positive thread engagement in holder fixtures
• Single-piece packaging for individual replacement or kit assembly

Compatibility

Designed for use with AGD (American Gage Design) dial drop indicators. Refer to your indicator manufacturer specifications to confirm stem diameter and holder thread requirements before installation.

Installation Notes

Installation is typically performed by metrology technicians or precision machinists. Ensure the indicator holder or arm threads are clean and free of damage before threading in the collet. Do not overtighten the collet clamping mechanism, as steel collets can score indicator stems if excessive force is applied. Verify that the 8.00 mm bore matches the indicator stem diameter before seating the indicator fully.