Spi 14-445-1 Surface Finish Comparator 8-specimen Nickel

Product Description

The SPI 14-445-1 is a nickel surface finish comparator used to visually and tactilely evaluate machined surface textures. The comparator contains 8 individual specimens covering a range of 0.4 to 12.5 Ra micrometers, equivalent to 16, 32, 63, 125, 250, and 500 AA microinches. Machinists, quality control inspectors, and toolroom technicians use this comparator to verify surface finish requirements on drilled and reamed workpieces without the need for electronic measuring instruments. The comparator measures 2.5 inches overall length by 5 inches overall width and weighs 0.25 pounds. Instructions and a protective case are included.

This comparator is suited for shop-floor and inspection environments where quick surface finish verification is required during or after machining operations. It is commonly used in general manufacturing, aerospace, and precision machining applications to confirm that drilled and reamed surfaces meet drawing callouts. The dual-scale format displays both Ra micrometers and AA microinch values, making it useful in facilities that reference either measurement convention.

Key Features

• 8 nickel specimens spanning 0.4 to 12.5 Ra micrometers (16 to 500 AA microinches)
• Dual-scale display: Ra micrometer and AA microinch for cross-reference use
• Covers drilling and reaming machining processes
• Compact form factor: 2.5 inches length by 5 inches width
• Includes instructions and protective carrying case
• Compliant with ANSI B46.1-1978, Military Specifications 45662, and SAE standards

Compatibility

Designed for use as a reference standard in surface finish inspection for drilled and reamed surfaces, conforming to ANSI B46.1-1978, Military Specifications 45662, and SAE requirements.

Installation Notes

No installation is required for this inspection tool. Store specimens in the included case to prevent contamination or damage to the reference surfaces. Handle specimens by the edges to avoid transferring oils or debris that could alter tactile comparisons. Calibration and use should follow the procedures outlined in ANSI B46.1 and any applicable facility quality standards.