4-4 Yanagi-machi Sabae City, Fukui 916-0047 Japan
E-mail address:info@fukuokarashi.jp
Representative: Mikihito Fukuoka
Contact person: Yoshihide Sawa
Date of foundation: 1948
Capital: ¥15 million
Number of employees: 90

〒916-0047 鯖江市柳町4-4
代表者:取締役社長 福岡 幹人  担当者:澤 善英
設立年:1948年  資本金:1,500万円  従業員数:90名

The world's smallest nut with slackening prevention device developed by our high-integrity accurate cutting work technology

Cross grip nut with slackening prevention function

Mechanism of our cross grip nut with slackening prevention function


Ordinary types of nuts gradually slaken as time passes due to constant vibration, impact shock, etc. To eliminate this problem, we developed the world's smallest nuts named Cross Grip Nuts with slackening prevention function. Our Cross Grip Nut has self-developed round and hollow projecting portion on it. This part is divided evenly into four sections by cross-shaped slots with the same groove as the nut crozed inside. When a nut is entwisted into a screw, this portion on the nut is expanded outward. Then the repulsive force created by its expansion is converged on central part of the screw. As a result, this portion grips the screw tightly and the screw is firmly tightened by the nut. This is the product created by high-integrity accurate cutting work technology at which we highly excel. Currently this nut has also been employed as auto parts etc besides eyewear frames.



Descreiption of our business

Manufacturing of optical components and various precision machining components

  • High-class eyewear metal components and other components used for optical equipment, light electrical appliances, acoustic equipment, medical equipment, etc
  • A wide variety of high precision metal components (nuts with slackening prevention device etc)


  • 高級メガネ金属部品、光学、弱電、音響、医療ほか
  • 各種精密金属部品(緩み止め機能付きナットなど)
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