The original single slotted self-locking nut developed in 1954 is still available today alongside a wider range of self-locking nuts. Despite major advances in technology, the single-slotted self locking nut still outperforms its rivals. Sometimes simplicity is better. SNEP nuts combine both extreme vibration resistance with re-usability so you can rely on it time and time again.

ESN-H100
- Single locking slot - simple but incredibly effective
- Reversible: Locking slot at 50% of nut height
- Re-usable up to 5 times with no performance loss according to ISO2320
- Quality class 6 & 8
ESN-H130
- Single locking slot - simple but incredibly effective
- Locking slot at 2/3 of the height of the nut
- Re-usable up to 5 times with no performance loss according to ISO2320
- Class 6, 8 & 10
- Made to ISO 7042 standard
- CF 00-040 European rail standard certified
DAH
- Double superposed locking slots
- Fitting with automatic assembly
- Class 8 & 10
- CF 00-040 European rail standard certified
- Network rail certified PA05/03451
- Re-usable up to 5 times with no performance loss according to ISO2320
Principle mechanical function:
The SNEP Nuts self-locking function is obtained by an axial deformed slot
The metal above the slot is set to de-pitch the threads so that when the nut is tightened on to a bolt, the thread is gripped on the flank.
The SNEP brand is a registered trademark of Arconic.
