ESL-HFR NUT METRICAL 對照標準 NF E 25-411 與SNCF ST 001-02 FPn6.

ESL – HFR NUT METRICAL : all metals reusable slotted self-locking hexagon nut standard to the NF E 25-411 and SNCF ST 001-02 FPn6. 

其中，術語解讀如下：

SNCF —— 法國國家鐵路公司（法語：Société nationale des chemins de fer français，SNCF），簡稱法鐵或法國國鐵，是法國最大的國營公司之一，也是歐盟區僅次于德鐵 (DB) 的第二大鐵路公司。

ST001-02 —— 鎖緊螺母執行標準。

其他HFR系列鎖緊螺母型號

The principle

The principle of self-locking nut ESL is to compress the flank of the thread of the male element on two sectors located in different planes and offset by 180 °. This principle is obtained by making two calibrated slots in the upper turret of the nut which are then crushed under a specific load to obtain a permanent deformation of the two slots (elastoplastic deformation). 
 

During the assembly, the deformed slots in the upper turret of the ESL nut are pushed by the thread of the male element. This thrust  generates pressure on the side of the flank of the thread of the male element on two ectors creating a constant locking torque (called self-locking). This self-locking torque is independent of the prevailling torque applied when tightening the ESL nut. 

The problem & The solution
 
In the petrochemical industry, compressors cannot fail at any time. For many years, J. Lanfranco nuts have been chosen by the most demanding companies in the compressor sector . 
The solution： 
After several tests and evaluations, ESL nuts have been approved for fixing flat valves:
● A single and unique piece, the ESL nut does not require specific knowledge or special tools.
● A nut with a tightening torque completely independent of any load.
● 100% perpendicularity possible if necessary.
● Constant tightening torque to achieve the correct bolt tension in all installations.

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