Spi 14-355-2 Micrometer Setting Ring 20mm

Product Description

The SPI 14-355-2 is a precision setting ring designed to calibrate and zero SPI Hole-Mike Series internal micrometers. Setting rings provide a known reference diameter that allows technicians and machinists to verify and adjust micrometer readings before measurement work begins. This ring is sized at 20mm and is used in metrology, quality control, and precision machining environments where bore measurement accuracy is critical. Manufactured to tight tolerances, it supports reliable, repeatable calibration routines. Weighing approximately 1 pound, it is compact and bench-ready for shop or lab use.

This setting ring is intended for use in precision measurement applications where internal bore micrometers require accurate zero-setting or calibration verification. Typical environments include machine shops, quality assurance labs, tool rooms, and manufacturing facilities working to close dimensional tolerances. It is used by machinists, metrology technicians, and quality control inspectors who rely on SPI Hole-Mike Series micrometers for bore and internal diameter measurement tasks.

Key Features

• 20mm reference diameter for precise micrometer calibration and zeroing
• Designed specifically for use with SPI Hole-Mike Series internal micrometers
• Enables repeatable zero-setting before critical bore measurement work
• Compact, bench-ready form factor suitable for shop or lab environments
• Sold individually — one setting ring per package

Compatibility

Designed for use with SPI Hole-Mike Series internal micrometers requiring a 20mm setting ring for calibration and zero-point verification.

Installation Notes

Setting rings are used by metrology technicians and machinists during calibration routines, not permanent installation. Handle the ring carefully to avoid surface damage that could affect reference accuracy. Store the ring in its protective case when not in use to preserve the precision-ground bore surface. Do not drop or stack with other tooling, as impact or scratching may compromise calibration integrity.