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Metric Analysis
This is a resource to address an assembly of common questions related to Metric Locknuts. More than Imperial Locknuts, Metrics can be a challenge to understand due to their limited use and updating activity among the various consensus standards organizations.
METRIC LOCKNUT TERMS
- Class – is determined by the proof load strength of the nut;
| Class | 4 | 5 | 8 | 9 | 10 | 12 |
|---|---|---|---|---|---|---|
| Proof Load | 510 MPa | 520 to 630 MPa | 800 to 920 MPa | 900 to 920 MPa | 1040 to 1060 MPa | 1150 to 1200 MPa |
- Grade – is typically applied to nut diameters, Grade A ≤ M16, Grade B > M16.
- Style – is typically applied to the ratio of nut diameter to nut thickness, Style 1 = D/.9, Style 2 = D/1.
- Type - is typically applied to …
EVOLUTION OF LOCKNUT SPECIFICATIONS
DIN 980 – replaced by DIN EN ISO 7042 (several changes to across flats)
DIN 985 – replaced by ISO 10511 & ISO 10513
DIN 6923 – replaced by ISO 4161
DIN 6925 – replaced by DIN EN ISO 7042 (fine thread to ISO 10513)
DIN 6926 – replaced by ISO 7043
DIN 6927 – replaced by ISO 7044 & DIN EN 1664 (nut height increased across all diameters)
NON-PREFERRED DIAMETERS AND ACROSS FLATS
According to ISO/TC 2, these are the Across Flats dimensions to be phased out;
M10 – 15 & 17
M12 – 19
M14 – 22
According to ISO/TC 2, these are the Diameters to be phased out;
M3.5, M14, M18, M22, M27, M33, M39, M45, M52, M60