Collection: Gauge Blocks

Trusted by machinists for calibration and inspection, our gauge blocks (also known as slip gauges or Jo blocks) are precision-ground to deliver consistent, repeatable measurements. Available in steel, ceramic, and carbide options, these ISO-grade blocks are ideal for toolroom setups and metrology labs alike. Whether you're stacking for custom lengths or checking micrometer accuracy, these cost-effective standards are built to perform.