Starrett 55949 Magnetic Indicator Positioner Holder

Product Description

The STARRETT 55949 is a magnetic indicator positioner holder designed to secure dial indicators, test indicators, and similar precision measurement instruments during inspection and machining operations. Built from ground steel, this holder mounts magnetically to ferrous surfaces and provides a stable, vibration-resistant base for accurate readings. The magnetic base delivers a rated pull force of 250 pounds, keeping the assembly firmly in place on machine tables, surface plates, mill beds, and other steel work surfaces. A thread adapter is included with the magnetic base, allowing compatibility with standard indicator stems and mounting rods. The unit is used by machinists, toolmakers, quality control technicians, and precision measurement professionals.

This indicator positioner holder is suited for use in machine shops, manufacturing cells, and quality inspection environments. It mounts directly to any flat ferrous surface and is sized for bench-top or machine-table use. The 3-inch base height, 3.5-inch base length, and 3-inch base width make it compact enough for tight work envelopes while still providing a stable footprint. No fine adjustment mechanism is incorporated into this model, making it straightforward to position and lock down quickly. Typical applications include runout checks, surface comparisons, bore measurements, and fixturing verification on lathes, mills, and surface plates.

Key Features

• 250 lb magnetic pull force for secure, slip-resistant mounting on ferrous surfaces
• Ground steel construction for dimensional accuracy and durability
• Includes magnetic base with thread adapter for standard indicator mounting
• 3-inch base height and 3.5-inch base length provide a compact, stable footprint
• Magnetic on/off base mount allows fast repositioning without tools

Compatibility

Designed as an OEM-style magnetic indicator holder compatible with standard dial indicator and test indicator stems. The included thread adapter accommodates common indicator mounting configurations. Confirm stem and rod thread sizing before installation.

Installation Notes

Installation is performed by machinists or metrology technicians. Ensure the mounting surface is clean, flat, and free of chips or coolant before activating the magnetic base. Disengage all machine motion and power down spindles before positioning the holder near moving components. Do not mount on non-ferrous surfaces, as the magnetic base will not hold securely.