Spi 14-448-5 Surface Finish Comparator 6 Specimens Nickel

Product Description

The SPI 14-448-5 is a nickel surface finish comparator used to visually and tactilely compare machined surface finishes against known reference specimens. It contains six belt-sanding specimens spanning a range of 0.1 to 3.2 Ra micrometers, which corresponds to 4, 8, 16, 32, 63, and 125 AA microinches. The comparator measures 2.5 inches in length by 5 inches in width overall and weighs 0.25 pounds. Machinists, quality control technicians, and metrology professionals use this tool to verify surface finish requirements on production and inspection floors without the need for electronic instrumentation.

This comparator is suited for evaluating belt-sanded surfaces in manufacturing, fabrication, and quality assurance environments. The nickel specimens provide durable, corrosion-resistant references that closely replicate actual machined surfaces. Both Ra and AA scale readings are marked on the comparator, making it compatible with shops referencing either unit system. The included storage case protects the specimens from contamination and physical damage between uses, maintaining reference accuracy over time.

Key Features

• Six nickel specimens covering 4, 8, 16, 32, 63, and 125 AA microinch (0.1 to 3.2 Ra micrometer) finishes
• Dual-scale markings in both Ra (micrometer) and AA (microinch) for cross-reference compatibility
• Belt sanding machining process specimens for accurate process-specific comparison
• Nickel material construction provides corrosion resistance and long specimen life
• Compact at 2.5 inches by 5 inches overall, sized for bench or field use
• Includes instructions and protective storage case

Compatibility

Designed for use with belt-sanded surface finish evaluation per ANSI B46.1-1978, Military Specification 45662, and SAE standards. Suitable for any inspection workflow referencing AA or Ra surface finish scales in those standards.

Installation Notes

No installation is required. This is a hand-held reference tool used by quality technicians and machinists during inspection. Keep specimens clean and free of oils, chips, or abrasives that could alter the reference surface. Store in the included case when not in use to prevent specimen damage or contamination.