The 6 Stages Of Making A Koken Socket

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Every Koken Socket goes through a strict manufacturing processes to ensure the highest quality standards are met. With over 60 years of design and research, you can always be assured your Koken sockets are amongst the best in the world.


Step 1: Forging of the Socket

Image-2Upper and lower punches of the press machine apply several hundred tons pressure on each cut section of steel rod. The forged steel immediately heats up to 300′ G due to the faction of the steel molecules caused by the extreme force of the press machine.

Step 2:Turning the socket


The turning process machines the forged steel sections into required shapes and dimensions. The MG ( Machining Center ) operates with extraordinary speed and precision.

Step 3: Marking the Socket

The article number, size, logo, production number, and MADE IN JAPAN are marked on the products after the turning process.

Step 4:Heat Treatment

To make the tools stronger and more durable, proper heat treatment is critically important The temperature and the time of the heat treatment are strictly regulated by a eery accurate control device.

Step 5: Polishing

To make the product’s surface smooth and beautiful, polishing by machine and hand buff.

Step 6: Surface Treatment


After heat treatment, the hand sockets and accessodes are chrome plated. The impact sockets are phosphate plated giving them a black colored finish. Compared with chrome plating, phosphate plated tools will not peel during heavy-duly use. Plating is the final production process.