2/8 fields identicalno sizes in common
ASME B18.22.1 vs ISO 7089
ASME B18.22.1 and ISO 7089 have no size designation in common: ASME B18.22.1 covers 1/4 to 3/4 and ISO 7089 covers M3 – M24, and no size appears in both tables, so there is nothing to compare dimension by dimension. Substituting one for the other starts from matching nominal diameters, which the equivalence claim does not do for you.
Specification comparison
| Specification | ASME B18.22.1 | ISO 7089 | Verdict |
|---|---|---|---|
| Standard body | ASME | ISO | differs |
| Title | Plain Washer — Inch Series | Flat Washer — Normal Series, 200 HV | differs |
| Fastener type | Flat washer | Flat washer | identical |
| Head type | — | differs | |
| Drive | — | differs | |
| Size range | 1/4 to 3/4 | M3 – M24 | differs |
| Number of listed sizes | 6 | 13 | differs |
| Thread standard length defined | No (non-threaded-part) | No (non-threaded-part) | identical |
Dimension differences by sizecomputed from the tables in this database
| Size | Difference in this database |
|---|---|
| 1/4 | size not listed in the other standard |
| 5/16 | size not listed in the other standard |
| 3/8 | size not listed in the other standard |
| 1/2 | size not listed in the other standard |
| 5/8 | size not listed in the other standard |
| 3/4 | size not listed in the other standard |
Rows shaded amber differ between the two standards. Substitution should be checked against the affected sizes rather than assumed from the equivalence alone.