Starrett 51243 Surface Gage 2 Spindle Hardened Steel

Product Description

The STARRETT 51243 is a surface gage designed for precision layout, inspection, and scribe-line work on flat reference surfaces. It features two spindles with spindle lengths of 12 inches and 18 inches, giving the technician flexibility to reach workpieces at varying heights without repositioning the base. The base measures 3.5 inches long by 3.1875 inches wide and is constructed from hardened steel for rigidity and wear resistance. At 5.313 pounds, the unit provides stable footing on a surface plate or machine table. Machinists, tool-and-die makers, and precision layout techs are the primary users.

The 51243 is suited for machine shop layout operations, quality control inspection stations, and toolroom applications. It performs well on granite surface plates, cast-iron surface plates, and precision-ground machine tables. The dual-spindle configuration allows simultaneous use of a scribe and a dial indicator holder, or two scribes set to different heights, reducing setup changes during complex layout work. It fits into general metalworking, maintenance and repair operations, and precision manufacturing environments.

Key Features

• Two spindles accommodate 12-inch and 18-inch reach for versatile height adjustment
• Hardened steel base resists wear and maintains flatness over repeated use
• Base footprint of 3.5 inches long by 3.1875 inches wide for stable surface contact
• 5.313-pound mass provides low center of gravity and reduces tip-over risk during scribing
• Dual-spindle design supports simultaneous scribe and indicator holder setups

Compatibility

Designed as an OEM-style replacement and standard surface gage suitable for general precision layout and inspection use on flat reference surfaces in toolroom and machine shop environments.

Installation Notes

Surface gages require no permanent installation. Place the unit on a clean, flat reference surface such as a certified granite or cast-iron surface plate before use. Ensure the base and surface plate are free of chips, burrs, and coolant residue to maintain contact accuracy. Spindle clamp screws should be snugged firmly before scribing or indicating to prevent slippage during traversal.