Standards and grades

DIN 125 (ISO 7089) plain washer and DIN 9021 wide washer

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DIN 125 is the standard plain washer that spreads the load under the bolt head or the nut. Its current equivalent is ISO 7089.

It is made in two forms that differ only in the chamfer: form A is flat with no chamfer and form B has a chamfer.

When the hole is oversized or the material of the part is soft, the DIN 9021 wide washer is used, equivalent to ISO 7093, with a larger outside diameter.

DIN standardISO equivalentUse
DIN 125ISO 7089Standard plain washer
DIN 9021ISO 7093Wide washer for oversized holes or soft material

DIN 125 dimensions from M6 to M24

Thread sizeInside d1 min.Outside d2Thickness h
M66.4121.6
M88.4161.6
M1010.5202
M1213242.5
M1617303
M2021373
M2425444

Values in millimetres. DIN 125 has been withdrawn and its replacement is ISO 7089, with the same dimensions.

Related articles (in Spanish)

DIN 933 e ISO 4017: equivalencias y diferencias reales → Por qué se aflojan los tornillos y cómo evitarlo →

Other standards and grades

DIN 933 (ISO 4017) bolt: full thread and property classes → DIN 931 (ISO 4014) bolt: part thread and property classes → DIN 934 (ISO 4032) nut: classes 8, 10 and 12 and sizes → ISO 4017 (DIN 933): fully threaded bolt dimensions → ISO 4014: bolt dimensions and thread length → DIN 985 prevailing torque nut: sizes and ISO equivalent → DIN 6914 (EN 14399-4) bolt: HV system and dimensions → DIN 975 threaded rod and DIN 976-1 stud → DIN 912 (ISO 4762) socket head screw: sizes and classes → Property class 8.8 bolts: strength, marking and nut → Property class 10.9 bolts: strength, use and class 10 nut → Property class 12.9 bolts: maximum strength and precautions →

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