: Specific allowable deviations for thickness, width, and length. For example, it categorizes tolerances based on the nominal thickness of the plate (e.g., under 1.60mm, 1.60mm to 2.50mm, etc.).
, adjusted to reflect specific Japanese market transaction practices Rounding Rules : Numerical values within the standard follow JIS Z 8401 , which provides the official guide for rounding numbers Application
The permissible variation in thickness depends on the nominal thickness and the width of the plate. Tighter tolerances are required for steel plates used in critical applications like pressure vessels. General thickness tolerances from JIS G 3193 are as follows: (Note: "w" = width, "t" = thickness)
JIS G 3193:2025 is a foundational document for the steel industry, specifying the essential physical properties that every buyer, seller, and user of hot-rolled steel must understand. It governs everything from how thick a steel plate can be to how much it can weigh or deviate from perfect flatness. The 2025 revision clarifies several key points, reflecting a continuous effort to keep the standard relevant and precise. For anyone engaged in specifying, purchasing, or inspecting steel products, obtaining the official PDF of JIS G 3193:2025 from an authorized source is an indispensable investment in ensuring quality, compliance, and clear communication. jis g3193 pdf
| Aspect | JIS G 3193 (Steel Plates & Sheets) | JIS G 3194 (Flat Bars) | | :--- | :--- | :--- | | | Plate/sheet; both length and width are large relative to thickness | Elongated flat bar; length is much greater than width | | Specified Dimensions | Thickness | Width, thickness, and length | | Maximum Width | Not specified; manufacturing capabilities determine maximum | Typically up to 500 mm |
While it is possible to find "free" PDFs of JIS G 3193 on unverified websites like Scribd, RENRENDOC, or TaoDocs, these sources are not reliable. Such unofficial files may be outdated (old revisions like 1990 or 2008). Important context, such as tables or footnotes, might be missing, and there is a significant risk of malware infection from downloading files from such sites. To guarantee you are working with the correct, current version, purchasing the official PDF is the only reliable method.
The standard provides separate tables for permissible variations in width, depending on whether the edge is a "mill edge" (as-rolled) or a "cut edge" (sheared or slit). Permissible length variations, meanwhile, are based on the specified length, with tolerances increasing as the sheet gets longer. A key point in the 2025 revision is the clarification that the standard's specified limits must be met a customer's specific request for measurement on certain parameters, such as the lateral warpage of steel strips. : Specific allowable deviations for thickness, width, and
For thicker plates, the plus tolerance is often larger than the minus tolerance to ensure the minimum required thickness is met. B. Width and Length Tolerances
The latest version, , continues to build on previous iterations like the 2019 and 2005 versions, aligning Japanese practices with international benchmarks like ISO 7452. Key Elements Covered in the Standard
(Japanese Standards Association)
While many websites offer "JIS G3193 PDF" downloads, it is important to ensure you are using the . Official copies can be purchased through: The Japanese Standards Association (JSA) The ANSI Webstore
What if you need an older version for legacy project verification? While the full, purchasable version of a superseded standard like JIS G 3193:2008 is still available for sale on many platforms, it is often marked as "historical" or "superseded".
: Standards for flatness, out-of-squareness, and camber (lateral curvature). Mass Calculation Tighter tolerances are required for steel plates used
I once consulted for a structural steel fabricator who downloaded a "free" JIS G3193 PDF from an unknown blog. They used thickness tolerances from the 1990 version (which allowed +0.8 mm tolerance on 9mm plate). The 2019 version allowed only +0.5 mm.