Spi 14-446-9 Surface Finish Comparator 8 Specimens Nickel

Product Description

The SPI 14-446-9 is a nickel surface finish comparator designed for hands-on measurement and verification of machined surface textures. It contains 8 individual specimens covering a range of 0.4 to 50 Ra micrometers, equivalent to 16 to 2000 AA microinches. Each specimen represents a standardized horizontal milling finish, allowing machinists, quality inspectors, and tooling engineers to make direct tactile and visual comparisons against a workpiece. The comparator measures 2.5 inches in length by 5 inches in width and weighs approximately 0.25 pounds. It ships complete with a protective case and printed instructions.

This comparator is used in machine shops, manufacturing floors, and quality control environments where surface finish must be verified against engineering drawings or contractual specifications. It is suited for incoming inspection, in-process checks, and final part acceptance. The horizontal milling specimen set makes it particularly relevant for milled components produced on knee mills, bed mills, and CNC machining centers. Quality engineers, CMM technicians, and shop floor inspectors are the primary users.

Key Features

• 8 nickel specimens spanning 16 to 2000 AA microinches (0.4 to 50 Ra micrometers)
• Horizontal milling machining process represented across all specimens
• Dual scale markings in both Ra micrometers and AA microinches for international use
• Meets ANSI B46.1-1978, Military Specification 45662, and SAE standards
• Includes protective carrying case and instructions
• Compact form factor at 2.5 inches by 5 inches for bench or field use

Compatibility

Designed for use in surface finish verification workflows referencing ANSI B46.1-1978, Military Specification 45662, and SAE standards. Applicable to any horizontal milling application requiring visual and tactile surface texture comparison across the 16 to 2000 AA microinch range.

Installation Notes

No installation is required. Handle specimens with care to avoid contaminating the reference surfaces with oils, debris, or abrasives that could alter tactile readings. Store the comparator in its included case when not in use to preserve specimen integrity. Calibration against a certified surface finish standard is recommended periodically per your facility quality program.