Renishaw A-5000-7551 Cmm Ball Stylus 4mm M4 Ruby

Product Description

The RENISHAW A-5000-7551 is a CMM ball stylus designed for coordinate measuring machine applications requiring precise surface contact and repeatable probe performance. It features a 4 mm ruby ball tip mounted on a stainless steel stem with an overall length of 18 mm and an M4 threaded shank for direct attachment to compatible CMM probe modules. Ruby is the preferred ball material in metrology due to its hardness, low surface roughness, and dimensional stability. This stylus is installed and qualified by metrology technicians and CMM operators working in quality control, inspection, and precision manufacturing environments.

This stylus is suited for general-purpose CMM inspection tasks on a wide range of part geometries. The 4 mm ball diameter and 18 mm overall length make it appropriate for feature access in shallow bores, surface profiling, and standard touch-trigger probing routines. It is a practical choice for production inspection cells and inspection labs running automated or manual CMM programs where a short, rigid stylus configuration is preferred to minimize deflection error.

Key Features

• 4 mm ruby ball tip for high hardness and low wear in repeated contact measurements
• 18 mm overall length provides a compact, rigid configuration that minimizes bending error
• M4 threaded shank for direct connection to standard CMM probe bodies and extension modules
• Stainless steel stem offers corrosion resistance and dimensional stability in shop environments
• Single-piece stylus construction supports consistent probe qualification and datum repeatability

Compatibility

Designed as an OEM-style replacement or standard service stylus for CMM probe systems accepting M4 threaded ball styli.

Installation Notes

CMM styli should be installed and qualified by trained metrology personnel familiar with the probe manufacturer's qualification procedures. Power down or pause any active CMM program before changing styli to prevent uncontrolled probe movement. Use the manufacturer-recommended torque when threading the stylus to avoid cross-threading or damaging the M4 interface. After installation, always re-qualify the stylus using the CMM's calibration sphere before resuming inspection routines.