Spi 14-442-8 Surface Finish Comparator 8 Specimen Nickel

Product Description

The SPI 14-442-8 is a nickel surface finish comparator used to visually and tactilely evaluate machined surface texture in the field or at the machine. It covers a range of 0.4 to 50 Ra micrometers, which corresponds to 16 to 2000 AA microinches, making it suitable for a wide range of machining and fabrication inspection tasks. The comparator includes eight individual specimens and ships with an instruction sheet and a protective case. Machinists, quality control technicians, and fabrication inspectors use this tool to verify that finished surfaces meet specified roughness tolerances without requiring electronic profilometer equipment.

This comparator is designed for applications involving flame cutting processes. It is used in fabrication shops, manufacturing facilities, and field inspection environments where surface finish must be verified against standard references. The eight specimens cover the most commonly specified Ra values: 16, 32, 63, 125, 250, 500, 1000, and 2000 AA microinches. Both the Ra and AA scales are represented, supporting documentation and inspection work on drawings that reference either scale convention.

Key Features

• Eight nickel specimens spanning 16 to 2000 AA microinches (0.4 to 50 Ra micrometers)
• Covers both Ra and AA surface finish scale conventions
• Nickel material construction for durability and consistent tactile reference
• Flame cutting process specimens for relevant fabrication inspection
• Compliant with ANSI B46.1-1978, Military Specification 45662, and SAE standards
• Includes instructions and protective carrying case

Compatibility

Designed as a standard surface finish reference comparator for use in flame cutting inspection applications per ANSI B46.1-1978, Military Specification 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. Keep specimens clean and free of oils or debris before use, as surface contamination will affect tactile and visual comparison accuracy. This tool is handled by quality control personnel and does not require any trade licensure to use.