Starrett 56687 Indicator Positioner Holder 250 Lb Magnetic

Product Description

The STARRETT 56687 is a magnetic-base indicator positioner holder designed for securing dial indicators and test indicators during precision measurement work. The unit uses a ground steel post-and-rod arm configuration with a 250-pound magnetic pull force to hold position firmly on ferrous surfaces. Fine adjustment capability allows the operator to make small, controlled movements to the indicator position without breaking the magnetic hold. The complete assembly includes a magnetic base, thread adapter, and upright post assembly consisting of a post, snug, gage rod with clamp, and fine adjustment mechanism. It is used primarily in machine shops, metrology labs, and manufacturing environments where accurate surface, bore, or runout measurement is required.

This holder suits applications on milling machines, surface plates, lathe beds, and other ferrous machine surfaces where a stable, repositionable indicator mount is needed. The post-and-rod arm style provides flexible positioning over the workpiece. The included base and hardware allow technicians to set up quickly without sourcing additional components. Both the post and arm measure 9-3/8 inches in length and 3/4 inch in diameter, providing a rigid, consistent reach across the measurement zone.

Key Features

• 250-pound magnetic pull force holds securely on ferrous machine surfaces
• Fine adjustment mechanism enables precise indicator positioning without lifting the base
• Ground steel construction on post and rod arm for dimensional accuracy and durability
• Post-and-rod arm style with 9-3/8 inch reach and 3/4 inch diameter for rigid support
• Kit includes magnetic base, thread adapter, upright post, snug, gage rod with clamp, and fine adjustment unit
• Overall length of 12 inches accommodates a wide range of indicator setups

Compatibility

Designed as an OEM-style accessory compatible with standard dial indicators and test indicators that accept common thread adapters; consult indicator thread specifications before mounting.

Installation Notes

Installation is performed by machinists or metrology technicians and requires no special tools beyond hand tightening of the snug and clamp hardware. Always verify the mounting surface is clean and free of chips or debris before engaging the magnetic base to ensure full contact and rated pull force. Disengage the magnet and release all clamps before repositioning the arm to avoid stressing the gage rod or indicator stem. Follow shop safety procedures when working near rotating machinery or energized equipment.