JIS B 7420 is the authoritative guide for dial indicators in Japan. While the standard itself is a technical document regarding dimensions, tolerances, and testing methods, its real-world impact is seen on every shop floor where a dial gauge is used to ensure parts are made to exact specifications. For anyone in precision engineering, understanding this standard is essential for selecting the right tool and interpreting its readings correctly.
It establishes that the GO gauge portion should correspond to the hole or shaft fit, while the NOT GO gauge portion is shorter or has a smaller functional area.
Apply a thin layer of anti-rust oil after use and store gauges in a padded case away from moisture and extreme temperatures. Finding and Using the JIS B 7420 PDF Legally
Accessing the official document provides engineers with technical data, wear limit formulas, and tolerance zones. These metrics are critical for maintaining strict quality control in precise mechanical manufacturing. What is the JIS B 7420 Standard? jis b 7420 pdf
: NOT GO gauges are often identified by a red mark or a distinct groove. NormSplash Procurement and Formats The standard is widely available in PDF format through several international standards organizations: Japanese Standards Association (JSA)
As of late 2025 and early 2026, there is no public information indicating that JIS B 7420 is currently under revision or has been superseded. A list of new and revised standards published in December 2025 by Japan's Ministry of Economy, Trade and Industry (METI) does not include JIS B 7420. Therefore, for the foreseeable future, JIS B 7420:1997 remains the definitive reference for plain limit gauges in Japan. However, users should always check the official JIS web portal or contact the JSA to confirm the latest status before undertaking a major project.
Plain limit gauges. Publication date 1997-03-31 Original language English. 120.70 EUR VAT included. 112.80 EUR VAT excluded. JIS B 7420:1997 Plain limit gauges - Intertek Inform JIS B 7420 is the authoritative guide for
Establish a calibration schedule based on usage frequency. A worn-out "Go" gauge will accept defective parts, compromising product safety. How to Access the Official JIS B 7420 PDF
: Applies to workpieces not exceeding 500 mm .
When manufacturing thousands of the same part, limit gauges are far cheaper and more durable than digital electronic gauges or Coordinate Measuring Machines (CMMs). What Does the JIS B 7420 Document Cover? It establishes that the GO gauge portion should
Features a shorter cylinder to ensure the hole does not exceed the maximum allowable diameter. 2. Ring Gauges (for Shafts) Used to inspect external diameters (shafts).
Kaito was working on a prototype for a high-speed rail bearing. The tolerance was so tight it felt more like a suggestion of physics than a reality of manufacturing. He picked up the shaft, wiped it with a lint-free cloth, and reached for the ring gauge.
Limit gauges do not measure the exact size of a thread. Instead, they determine if a thread falls within its specified maximum and minimum material limits. This is known as .
—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)
Accessing exact, standardized dimensions for designing or ordering gauges.