Mitutoyo 611186-531 Individual Inch Rectangular Steel Gage Block 0.146" ASME Grade 0

The Mitutoyo 611186-531 is an individual rectangular steel gage block with a nominal length of 0.146 inches, conforming to ASME B89.1.9-2002 Grade 0 accuracy standards. Also known as gauge blocks, Jo blocks, slip gages, and Johansson gages, gage blocks are precision length standards used to calibrate measuring equipment and instruments in manufacturing and metrology.

This Grade 0 block is well-suited for workshop and inspection applications, including calibrating and inspecting mechanical parts and tools, verifying the accuracy of plug and snap gages, and setting electronic measuring devices. The nominal length is laser-etched onto the block in clear black characters for easy identification, and a unique identification number is etched on the block for full traceability.

Key Features:

• Nominal length: 0.146 inches, laser-etched for clear readability
• ASME Grade 0 — meets ASME B89.1.9-2002 standards for flatness, length, parallelism, and surface finish
• High-carbon, high-chrome steel construction for maximum hardness and wear resistance
• Rectangular base geometry enables accurate wringing to other gage blocks
• Unique identification number laser-etched for traceability
• Supplied with a Mitutoyo Inspection Certificate (NIST-traceable) confirming conformance to grade standards
• Inspection certificate specifies the deviation of the block from its nominal length

Gage blocks can be wrung together — a process of lapping blocks with a thin film of oil — to build up a precise composite measurement reference. Purchasing an individual block in the required size is ideal when only a single specific length is needed repeatedly. The Mitutoyo 611186-531 is sold as a single block and is a reliable primary standard for dimensional metrology, quality control, and precision manufacturing environments.