Self Locking Nuts

Helisert Self-Locking Nuts withstand vibration, heat and eliminate corrosion, even at temperatures upto 400°C.

One or more stainless steel grip coils near the centre of the thread inserts inside the nut holds the screw/bolt securely against loosening. They maintain a strong constant pressure on the external threads.

The thread inserts provides a permanent internal thread.

Fish Nuts: M25 x 3, specially designed for Railway fishplate bolts.

Benefits
# Applied torque does not have to overcome thread friction due to imperfect thread form. Almost all torque is used to stretch the bolt.
# Greater loading for applied torque than ordinary nuts.
# Maintain preload stretch in bolt beyond amplitude of unload vibrations.
# Insert is flexible and compensates for lead and angle errors always presents in making threads.
# Load is more evenly distributed over all engaged threads.
# Can be repeatedly assembled and dis-assembled without loss of efficiency.

Advantages
# More efficient than locknuts with nylon inserts against heat etc.
# Extremely close tolerance.
# Increased load-bearing capacity.
# High Tensile stainless steel threads of hardness HRC 43.50