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Reference Tools
Free, no sign-up, no email wall. Built against the published standards rather than against other websites, with the review date on every page and an open invitation to correct them.
JIS stainless grade converter
Type SUS304, 1.4301, S30400 or 304 and get every other designation, plus family, relative machinability and PREN. Twenty grades.
JIS G 4303 / EN 10088-3 / ASTM A276General tolerance calculator
Enter a dimension and a class letter for the exact permissible deviation, plus the geometrical limits for classes H, K and L. Full tables underneath.
JIS B 0405 / JIS B 0419Surface finish converter
Ra, N grade, microinches and the legacy JIS triangle marks, with the producing process and what each level costs on a stainless part.
JIS B 0601 / ISO 1302Why these three
They are the three things that most often get read wrong on a JIS drawing, in the order they cost money. A grade that gets substituted without the certificate being checked. A tolerance class that nobody opened the title block to find. A finish symbol from a withdrawn standard that a shop prices as as-machined.
None of them are language problems, which is why translation does not fix them.
How they are maintained
Every value is checked against the published standard, not copied from another site. Where the standards genuinely disagree, the range is shown instead of a single number: the legacy four triangle mark, and Rz, which cannot be converted from Ra at all. Where a figure overstates real behaviour, the caveat travels next to it, as with PREN for SUS303 and SUS440C.
Last reviewed 2026-09-23. Found an error? Write to sales at suscnc.comwith the clause and we will correct it and say so.
Standards behind the tools
| Standard | Covers |
|---|---|
| JIS G 4303 | Stainless steel bars |
| JIS G 4304 / G 4305 | Hot and cold rolled stainless plate, sheet and strip |
| JIS B 0001 | Mechanical engineering drawing, third angle projection |
| JIS B 0405 | General tolerances, linear and angular dimensions |
| JIS B 0419 | General tolerances, geometrical characteristics |
| JIS B 0601 | Surface texture, Ra and Rz |
| JIS B 0205 / B 0209 | Metric screw threads and their tolerance classes |
| ISO 2768-1 / -2 | The ISO equivalents of JIS B 0405 and B 0419 |
| ISO 286 / ISO 1302 | Limits and fits, surface texture indication |
| EN 10088 / EN 10204 | European stainless grades and inspection document types |
| ASTM A276 / A967 | Stainless bar, and chemical passivation |
| AMS 2700 | Passivation for aerospace parts |
Got as far as a drawing?
Send it and an engineer reads the title block and quotes the part within 24 business hours. One PO, one invoice, inspected before it ships.
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