—the largest possible shaft or the smallest possible hole. A "Go" gauge must fit or pass through the part. NOT GO Gauges : Designed to check the Least Material Limit (LML)

Established in 1964 and revised most significantly in 1997, is largely based on the international standard ISO/DIS 1938-1 . It outlines the design, tolerances, and calibration methods for gauges used to verify the maximum and minimum material limits of mechanical workpieces. Core Technical Specifications

: Free technical samples showing symbols and definitions are available on PhysicsNorm and NormSplash .

: Based on the Maximum Material Limit (MML). It must be able to enter or fit over the part. NOT GO Gauge

: Gauges like snap gauges are typically calibrated by comparison to ring gauge standards with a typical measurement uncertainty (e.g., for sizes up to Wear Limits : The standard provides formulas and tables for maximum permissible gauge wear to ensure continued accuracy in production environments. NormSplash 5. Availability Official Source

If you need the authentic standard, here are the only legitimate sources: