Old JIS

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, old JIS

Diagram: Plain washer Old JIS

Nominal diameter	Inside diameter	Outside diameter		Thickness
Nominal diameter	Inside diameter	Bright round bar	Small round bar	Bright round bar	Small round bar

Notes

This table holds the values of JIS B 1256:1963. Inside and outside diameters differ from the current 2008 edition at most sizes. Use it when you have to match existing equipment or drawings.
References

JIS B 1256(1963)

Small round bar goes up to M24. M27 and above are shown as a dash.

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Washers — Plain washer — Old JIS — Washer Dimensions | Updraft - Mechanical Engineering Calculators