Starrett 50366 Outside Caliper Spring Joint 6 Inch

Product Description

The STARRETT 50366 is a spring-joint outside caliper designed for taking outside measurements on workpieces in machine shop, fabrication, and tool-and-die applications. The caliper features 6-inch flat legs made from polished steel, giving it a smooth finish that resists corrosion and wear during regular shop use. A solid nut and screw adjustment method allow the technician to set the leg spread precisely and hold the measurement reliably while transferring it to a rule or scale. At 0.25 pounds, the 50366 is light enough for all-day hand use without fatigue.

This caliper is suited for machinists, toolmakers, pipefitters, and general trade professionals who need a quick, repeatable method for gauging outside dimensions without a digital or vernier instrument. It handles outside measurements up to 6 inches (150 mm), making it practical for shafts, fittings, round stock, and similar workpieces found in both production and maintenance settings. The spring-joint design automatically returns the legs to a set opening, keeping the measurement consistent between pickups.

Key Features

• Spring-joint construction automatically maintains leg spread for consistent measurement transfer
• 6-inch flat legs provide up to 6 inches (150 mm) outside measurement capacity
• Solid nut with screw adjustment for precise, lock-in setting
• Polished steel construction resists corrosion and wear in shop environments
• Compatible with the Starrett 79 rule for direct measurement reading
• Lightweight at 0.25 pounds for extended hand use

Compatibility

Designed for use with the Starrett 79 rule as noted in manufacturer specifications. Suitable as a standard spring-joint outside caliper for general machining, fabrication, and maintenance trade applications.

Installation Notes

No power source or special tooling is required for use. Before measuring, confirm the caliper legs are clean and free of burrs that could affect contact accuracy. When transferring a measurement, hold the caliper perpendicular to the workpiece axis to avoid parallax error. Handle the polished steel legs with care to prevent nicks that would compromise measurement contact points.