Disaster prevention and disaster measures! Locking nut 'U-NUT'
"U-NUT", "U-NUT with cap", "U-NUT with washer", "CLIP U-NUT", "BL U-NUT", and others.
Since its birth over 60 years ago, the U-NUT, known for its reliability and achievements, is the industry standard for locking nuts that deliver safety and peace of mind.
The "U-NUT" is used in various disaster prevention and disaster response products that are subjected to wind and water pressure, such as seismic reinforcement work for bridges, temporary road installation work, seismic devices and lightning rods for buildings, emergency generators, fire extinguishers, shutters, vibration parts of fire doors, parabolic antennas, mounting brackets for solar panels, stop wires for tetrapods, and installation brackets for marine buoys (markers). No matter how harsh the usage environment, the "U-NUT" is required to provide safety and peace of mind. It excels not only in anti-loosening performance but also in preventing detachment and reusability, making it active in various industries. 【Features】 ■ Fastening Function: Exhibits stable anti-loosening performance ■ Detachment Prevention: Prevents early detachment even if axial force decreases ■ Reusability: Can be reused ■ Easy Fastening: No need for skilled techniques or specialized tools ■ Individual Parts: Facilitates parts management and prevents installation errors ■ Heat and Cold Resistance: All-metal products conform to the inherent heat resistance temperature of the material *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: Screwing in from the side of the friction ring is not possible. 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 similar tool to unscrew until the friction ring is free from the bolt's threads. Once the friction ring is no longer in contact with the bolt's threads, you can unscrew 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
【Case Studies】 ■ Bridge seismic reinforcement work ■ Temporary road installation work ■ River disaster recovery work ■ Seismic devices for buildings ■ Lightning rods ■ Emergency generators ■ Fire extinguishers ■ Shutters ■ Fire doors ■ Tether wires for tetrapods ■ Installation of marine buoys (markers) ■ Mounting brackets for parabolic antennas ■ Mounting brackets for solar panels, etc. * These products are used in various industries and sectors related to loosening. 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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| Small U_SUS | IGS data |
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| Small U_SUS | sldprt data |
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| Small U_SS | IGS data |
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| Small U_SS | sldprt data |
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| Small U_SC | IGS data |
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| Small U_SC | sldprt data |
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| Seat with metal base_SUS | IGS data |
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| Seat with metal base_SUS | sldprt data |
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| Seat cushion with payment_SS | IGS data |
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| Seat cushion with attachment_SS | sldprt data |
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| UNC_SUS | IGS data |
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| UNC_SUS | sldprt data |
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| UNC_SS | IGS data |
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| UNC_SS | sldprt data |
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| UNC_SC | IGS data |
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| UNC_SC | sldprt data |
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| FLANGE_SUS | IGS data |
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| FLANGE_SUS | sldprt data |
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| FLANGE_SS | IGS data |
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| FLANGE_SS | sldprt data |
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| FLANGE_SC | IGS data |
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| FLANGE_SC | sldprt data |
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| CAP_SUS | IGS data |
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| CAP_SUS | sldprt data |
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| CAP_SS | IGS data |
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| CAP_SS | sldprt data |
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| WELD_SS | IGS data |
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| WELD_SS | sldprt data |
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| WU_SUS | IGS data |
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| WU_SUS | sldprt data |
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| WU_SS | IGS data |
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| WU_SS | sldprt data |
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| WU_SC | IGS data |
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| WU_SC | sldprt data |
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| U_3 types_SUS | IGS data |
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| U_3 types_SUS | sldprt data |
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| U_3 types_SS | IGS data |
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| U_3 types_SS | sldprt data |
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| U_3 types_SC | IGS data |
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| U_3 types_SC | sldprt data |
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| U_SUS | sldprt data |
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| U_SUS | IGS data |
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| U_SS | sldprt data |
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| U_SS | IGS data |
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| U_SC | sldprt data |
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| U_SC | IGS data |
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| CU_SUS | sldprt data |
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| CU_SUS | IGS data |
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| CU_SS_Molten Zinc Coating | sldprt data |
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| CU_SS_Molten Zinc Coating | IGS data |
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| TFU_SC | IGS data |
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| TFU_SC | sldprt data |
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| SU_SUS | sldprt data |
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| SU_SUS | IGS data |
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| GU_SS | sldprt data |
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| GU_SS | IGS data |
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| BLU_SUS | sldprt data |
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| BLU_SUS | IGS data |
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| FUN_SUS | sldpr data |
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| FUN_SS | sldpr data |
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| FUN_SC | sldpr data |
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| FUN_SUS | IGS data |
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| FUN_SS | IGS data |
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| FUN_SC | IGS data |
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Company information
Since our establishment in 1962, Fuji Precision has focused exclusively 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 prone to loosening. 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. Although bolts and nuts may be considered small parts, they play a crucial role in connecting functions and technologies. They can be described as cross-point technology that combines cutting-edge technologies and opens up new technological fields. Fuji Precision regards this theme as an eternal proposition and has been committed to product development that anticipates the needs of the times, while pursuing high quality and high added value in our products. Our future goal is to become the world's number one comprehensive manufacturer of locking nuts. We will continue to strive to create products that meet your trust and contribute to the industrial sector and society.