In 1951, Kohara Gear built a steel-frame factory building at Nakacho, Kawaguchi, and set about manufacturing stock gears.  In 1955, it invested one hundred fifty million yen in up-to-date facilities to introduce the latest gear-cutting machines earlier than others.  In 1964, it further installed new machines to be able to cope with mass production.

Over the same period, Kohara Gear pushed on standardization of gears and put KHK brand spur, bevel and worm gears on the market. In 1962, it succeeded in building up a nationwide sales network.  

Takumi Inada, a former director of Kohara Gear said:
"At first, I had difficulty in having people understand what KHK stock gears really were. It took me time to get my point across.  It was from around 1957 on, that KHK stock gears fared well on the market. We earned the users' trust and the sales agents' trust, and were able to expand the stock gear line."
He continued, "In order to determine the type of gears to be included in stock gear line, we analyzed all orders coming in and tried to find out the need that people had then. Further, we spent some thought on it before we came to a conclusion.

Hideaki Yonehara, a former manager of Kohara Gear said:
"As the penetration of KHK stock gears on the market rose, we were able to procure up-to-date machines such as Karatsu's gear shapers, Nihon Kikai's 26-inch hobbing machines and Kashifuji's KR600.  Up to then we had been mostly using second hand machines."
He continued, "The president (Tomizo) took a positive approach towards adopting cutting edge gear manufacturing machines. He told us that in order to gain users' confidence we should always take best measures to produce quality products."  We took over his belief and procured Gleason No.104 straight bevel Coniflex generator, Gleason No.108 hypoid generator, MAAG SD32X gear grinding machine, Reishauer gear grinder NZA, etc."

Thus, Kohara Gear had succeeded little by little in establishing a firm position as a manufacturer specialized in stock gears.