BS EN 14399-3-2005 High-strength hex nuts for steel structures - HR type drawing
| Legend: | Making: |
| P=pitch | Carbon Steel:6,8,10,12 |
| K=height of the nut | Thread:6H |
| D=the nominal diameter of the thread | Surface:BLK,ZP,HDG,etc |
| E=The length of the diagonal | |
| S=The length of the flat |
EN 14399-4-2005 High-strength hex nuts for steel structures - HV type has equivalent norms included: GB/T 18230.4, ISO 7414, DIN EN 14399-4, UNI 5713.
| Legend: | Making: |
| P=pitch | Carbon Steel:6,8,10,12 |
| K=height of the nut | Thread:6H |
| D=the nominal diameter of the thread | Surface:BLK,ZP,HDG,etc |
| E=The length of the diagonal | |
| S=The length of the flat |
Both EN 14399-3 nuts and EN 14399-4 nuts are high-strength nuts and bolts for preloading. BS EN 14399-3 structural nuts are used for part 3 which belongs to system HR. EN ISO 14399-4 structural nuts are used for part 4 which belongs to system HV.