HARDLOCK Nut provides unparalleled self-locking performance even in the toughest environments and applications

Every company has important missions, HARDLOCK Industry’s mission is to provide unrivaled Safety and Increased Performance.
When you need fail safe fastening performance in the most demanding vibration environment, trust HARDLOCK Nuts (HLN) to meet or exceed your expectations.
The primary reason for loosening in bolted joints is a drop in the initial clamp load occurring due to external forces such as impact and vibration, to battle this you need to eliminate the play (gap) between the threads of the bolt and nut. Play will lead to not only shortened life span but also bolt brakeage which can result in catastrophic accidents. 
We hit on the idea of utilizing the wedge principle, widely used in ancient Japanese architecture. Thanks to the design inspired by the principle, HLN completely eliminates the play between the threads and withstands severe vibration longer than any other nuts in the world.
HLN consists of two nuts, the first nut (1) „Convex Nut“ (clamping nut) has an eccentric protrusion on the upper surface. The second nut (2) „Concave Nut“ (locking nut) is designed with a concentric recess for locking the two nuts together. By tightening the Concave Nut onto the Convex Nut, a strong perpendicular load will be applied to the bolt from both sides locking the HLN and making it resistant to vibrations and impacts from any direction.
After installing HLN you will realize a significant decrease in maintenance related work due to its exceptional self-locking effect. This will offer improvement of running cost, though HLN is a high end product, in combination with the advantage that it can be reused multiple times without almost any decrease in performance. HLN is entirely made from metal only unlike other common self-locking nuts and is available in various materials and surface treatment suitable for any environment. 
HLN is predominantly used in applications which require safety at higher level in extreme conditions and environments, including but not limited to; Railway, Mining, Civil engineering and Machinery, just to name a few.
Let us give a specific example of performance effectiveness and cost benefit. HLN has been approved for use on non-welded railway joint applications employing standard bolted connections by Network Rail in UK. While passing extensive testing as best performance among other competitor solutions, the fact that Network Rail has already installed over half a million HLN on stretcher bars with 0% failure was evaluated. Commercial benefit also made HLN the preferred choice since it reduces the installation time over the existing method of securing the joint and does not require special cutting machinery during the removal process.
HLN is also specified and installed on TFL London Underground points and stretcher bars.

Date : 09.03.2018