Spi 30-695-1 Surface Finish Comparator 30 Specimens

Product Description

The SPI 30-695-1 is a nickel surface finish comparator designed for measuring and visually comparing surface roughness values from 2 to 500 Ra micro inches. The set includes 30 individual specimens organized by machining process, allowing technicians, machinists, and quality control inspectors to perform quick, accurate tactile and visual comparisons directly at the machine or inspection station. Each specimen is precisely manufactured to represent a specific Ra value, and the complete set ships with a protective carrying case and printed instructions.

This comparator is suited for use in machine shops, manufacturing facilities, and quality labs where surface finish verification is part of production or inspection workflow. Applicable processes covered include flat lapping, grinding, horizontal milling, reaming, turning, and vertical milling. The nickel material provides durability and corrosion resistance for repeated shop floor use. Inspectors and machinists working to ISO, SAE, or military specifications will find the standards coverage relevant to their documentation requirements.

Key Features

• 30 nickel specimens covering 2, 4, 8, 16, 32, 63, 125, 250, and 500 Ra micro inch surface finishes
• Organized by machining process: flat lapping, grinding, horizontal milling, reaming, turning, and vertical milling
• Meets ISO, SAE, and military specification standards for surface roughness comparison
• Includes protective carrying case for storage and transport
• Printed instructions included for reference at point of use
• Nickel construction for shop-floor durability and resistance to corrosion

Compatibility

Designed for use as a surface roughness reference standard in machine shops and inspection environments where flat lapping, grinding, milling, reaming, and turning processes are evaluated against ISO, SAE, or military surface finish specifications.

Installation Notes

No installation is required. This is a hand-held reference tool used by machinists and quality inspectors for comparative surface finish evaluation. Store specimens in the included case to prevent surface contamination or damage that could affect reading accuracy. Keep specimens clean and handle by the edges to maintain the integrity of the reference surfaces.