Since its birth over 60 years ago, the locking nut "U-NUT" has continued to evolve in its locking performance, durability, and vibration resistance, backed by a wealth of trust and achievements.
"U-NUT" is a locking nut that is active in various industries, from railway and bridge steel structures to cars, motorcycles, and industrial machinery. No matter how harsh the usage environment, this product, which demands safety and reliability, continues to evolve not only in its locking performance but also in durability and vibration resistance. 【Features】 ■ Fastening Function: Provides stable locking performance ■ Drop Prevention: Prevents early drop even if axial force decreases ■ Reusability: Can be reused ■ Easy Fastening: No need for skilled techniques or special tools ■ Standalone Component: Makes part management easier and prevents installation errors ■ Heat and Cold Resistance: Made of all-metal, excellent in heat and cold resistance * NETIS Registration No. KT-130064-VE (old registration) New technology name U-Nut * For more details, please refer to the PDF document or feel free to contact us.
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basic information
<Installation Procedure> 1. Pass the bolt through the fastening component. Ensure that the bolt has a thread accuracy of 6g (Grade 2) and that the tip of the threaded section has been chamfered. 2. Manually screw in the bolt until the friction ring makes contact with the tip of the threaded section. *Note: It is not possible to screw in from the friction ring side. 3. Tighten using a wrench or other fastening tool. 4. Confirm that the threaded section of the bolt extends more than two pitches from the friction ring. When removing, use a wrench or other tool to unscrew until the friction ring is clear of the bolt's threads. Once the friction ring is no longer in contact with the bolt's threads, you can unscrew it by hand. *For more details, please refer to the PDF document or feel free to contact us.
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Applications/Examples of results
【Delivery Examples】 ■Motorcycles ■Four-wheel vehicles ■Construction machinery ■Machine tools ■Industrial machinery ■Agricultural machinery ■Home appliances ■Railways ■Civil engineering ■Architecture ■Play equipment ■Welfare equipment ■Communication, etc. *Our products are used in various industries and sectors. For more details, please refer to the PDF materials or feel free to contact us.
catalog（3）
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CAD data（64）
| Model number | overview | File |
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| CU_SS_Molten Zinc Coating | IGS data |
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| U_SC | IGS data |
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| FUN_SS | sldpr data |
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| CU_SUS | sldprt data |
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| U_SC | sldprt data |
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| FUN_SUS | sldpr data |
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| BLU_SUS | IGS data |
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| BLU_SUS | sldprt data |
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| GU_SS | IGS data |
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| GU_SS | sldprt data |
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| SU_SUS | IGS data |
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| SU_SUS | sldprt data |
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| TFU_SC | sldprt data |
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| TFU_SC | IGS data |
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| WU_SC | sldprt data |
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| WU_SC | IGS data |
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| WU_SS | sldprt data |
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| WU_SS | IGS data |
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| WU_SUS | sldprt data |
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| U_SS | IGS data |
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| U_SS | sldprt data |
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| U_SUS | IGS data |
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| U_SUS | sldprt data |
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| U_3 types_SC | sldprt data |
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| U_3 types_SC | IGS data |
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| U_3 types_SS | sldprt data |
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| U_3 types_SS | IGS data |
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| U_3 types_SUS | sldprt data |
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| U_3 types_SUS | IGS data |
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| FLANGE_SUS | IGS data |
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| UNC_SC | sldprt data |
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| UNC_SC | IGS data |
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| UNC_SS | sldprt data |
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| UNC_SS | IGS data |
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| WU_SUS | IGS data |
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| WELD_SS | sldprt data |
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| WELD_SS | IGS data |
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| CAP_SS | sldprt data |
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| CAP_SS | IGS data |
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| CAP_SUS | sldprt data |
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| CAP_SUS | IGS data |
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| FLANGE_SC | sldprt data |
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| FLANGE_SC | IGS data |
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| FLANGE_SUS | sldprt data |
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| Small U_SC | sldprt data |
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| Small U_SC | IGS data |
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| Small U_SS | sldprt data |
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| Small U_SS | IGS data |
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| Small U_SUS | sldprt data |
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| FUN_SC | IGS data |
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| FUN_SS | IGS data |
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| FUN_SUS | IGS data |
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| FUN_SC | sldpr data |
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| CU_SS_Molten Zinc Coating | sldprt data |
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| CU_SUS | IGS data |
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| FLANGE_SS | sldprt data |
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| FLANGE_SS | IGS data |
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| UNC_SUS | sldprt data |
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| UNC_SUS | IGS data |
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| Seat cushion with payment_SS | sldprt data |
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| Seat cushion with attachment_SS | IGS data |
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| Seat cushion with SUS (stainless steel) | sldprt data |
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| Seat with metal base_SUS | IGS data |
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| Small U_SUS | IGS data |
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Company information
Since our establishment in 1962, Fuji Precision has focused solely on the research and development of locking nuts, growing into a comprehensive manufacturer of locking nuts. The 'U-Nut' brand was the first in the industry to introduce the "metal ring locking function" to bolts and nuts, which were traditionally considered to loosen. This groundbreaking product received a significant response upon its release and has now grown to capture a 50% share of the domestic market, becoming synonymous with locking nuts. Though small parts, bolts and nuts play a crucial role in connecting functions and technologies. They can be seen as a cross-point technology that combines cutting-edge technologies and opens up new technological fields. Fuji Precision has taken this theme as an eternal proposition, working on product development that anticipates the needs of the times while pursuing high quality and added value in our products. Our goal for the future is to become the world's number one comprehensive manufacturer of locking nuts. We will continue to strive for product development that meets your trust and contributes to the industrial sector and society through even greater efforts.