Rated 1 out of 5Â by OldFellow Not BS4320 Form A M10 Washers
The description says M10 Form A => 10.5 ID, 21.0 OD, 2.2 thick [BS 4320].
The contents of the box measure : 10.5 ID 17.8 OD 1.6 thick.
The box says M10 Light Washer, which is not enlightening.
- these are M10, but not ISO 9000, washers
- they are too thick to be form B and too thin to be form A
- and their outside diameter is about 3 mm under size for form A and B
6 Feb 2014