4CZech (https://www.4czech.eu/en/)

4CZech One sockets

4CZech ONE sockets are unique sockets on the market. It is a professional socket without any compromise. The socket will not damage a loosened or tightened screw or nut. Morover, it can loosen a nut or screw which is up to 85% damaged.

4CZech One socket was designed to spread the contact area and to prevent damage to the hex nut.

4CZech One socket

Less than 1° bevel angle design, 4CZech One socket supply a „Line“ contact between a socket and a nut, which protects the nut corner from being damaged.

Ordinary socket

There is a contact between the nut and a point,
a nut corner is easily damaged and becomes rounded.



Test Result 1: Thanks to "Line" contact of 4CZech ONE Socket, tester-nut remains in a very good condition after testing, on the contrary tester-nut of "Ordinary socket" is damaged after testing and its shape is different.


4CZech One socket

The surface and the edge of the tester-nut remain the same shape after using 4CZech One Socket.


Ordinary socket

Edges of the tester-nut are damaged after using Ordinary socket.



Test result 2: Socket 4CZech One contacts nut perfectly, thus the torque can evenly spread over nut while applied power.

4CZech One socket

Because all six edges of nut contact perfectly with 4CZech One socket, the torque can evenly spread over the nut head while applied power, thus the tester-nut is evenly worn out after test by 4CZech One socket.

Ordinary socket

The nut joins only few certain points of the ordinary socket, the torque can't evenly spread over the nut head while applied power so, the tester-nut is unevenly broken after test by ordinary socket.



Limit Factor Analysis (stress-distributed test): Total contact 4CZech One socket with high performance design allows socket bear less stress concentration and makes your job easier and labour saved.

4CZech One socket

Less green color shows 4CZech One socket‘s line contact. It reduces both socket and tester-nut stress concentration.

Ordinary socket

More green color shows that both conventional
socket and tester-nut bear much more stress concentration.




Benefit: 4CZech One socket always succeeds in those rounded nuts, especially up to 85% rounded nuts.



Patented: 4CZech One socket was awarded by patent of USA and Germany.

You can buy 4CZech One sockets on our e-shop.

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