steel gage block
Steel gage blocks, also known as gauge blocks or Johansson gauges, are precision measurement tools that serve as the foundation for dimensional quality control in manufacturing and metrology. These rectangular blocks are manufactured to extremely precise dimensions, serving as the primary reference standards for length measurements in industrial settings. Made from high-grade steel alloys, these blocks are engineered to maintain dimensional stability over extended periods, with accuracy levels typically ranging from ±0.00001 to ±0.000001 inches. The blocks feature two parallel surfaces that are ground and lapped to achieve exceptional flatness and parallelism, enabling them to wring together through molecular attraction. This unique characteristic allows users to combine multiple blocks to achieve specific required dimensions. Steel gage blocks are essential in calibrating measuring instruments, setting up machine tools, and verifying the accuracy of manufactured parts. Their versatility extends across various industries, including aerospace, automotive manufacturing, and precision engineering. The blocks undergo rigorous quality control processes during manufacturing and are typically supplied with calibration certificates that ensure traceability to national standards.