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Current JIS (2008)

Old JISJIS B 1256(1963)Dimensions from the 1963 JIS. Some sizes differ from ISO in outside diameter and thickness, so use it when you have to match existing equipment or drawings. M1 to M52 are listed.ISO (new JIS)JIS B 1256(1978)Dimensions aligned with ISO. The values are from the 1978 edition and cover a wide range, M1 to M80. Some sizes differ from the current 2008 edition.Current JIS (2008)JIS B 1256(2008)Product grade A dimensions from the current JIS. Use these for new designs. The normal type is specified from M1.6 to M64 and the small type up to M36.

Plain washer, current JIS (2008)

Diagram: Plain washer Current JIS (2008)
Nominal diameterInside diameterOutside diameterThickness
Bright round barSmall round barBright round barSmall round bar

Notes

  • Product grade A gives the nominal dimensions. The normal type is specified from M1.6 to M64 and the small type up to M36; larger sizes of the small type are left blank.
  • As well as the nominal sizes, the standard sets deviations: the maximum inside diameter, the minimum outside diameter and the maximum and minimum thickness. Consult the standard itself if you need the tolerances.
  • Some sizes differ from the 1963 and 1978 editions. To match existing equipment or drawings, see those pages instead.
  • References
    • JIS B 1256(2008)
Washers — Plain washer — Current JIS (2008) | Updraft - Mechanical Engineering Calculators