Even when used alone, it demonstrates anti-loosening performance! Anti-loosening nut U-NUT.
"U-NUT", "U-NUT with CAP", "U-NUT with Washer", "CLIP U-NUT", etc.
By improving the efficiency of the binding process, we achieve a reduction in construction days and a decrease in total costs such as maintenance expenses!
The "U-NUT" is a locking nut that is active in various industries, from tunnels on roads and railways to steel structures such as skyscrapers and bridges, as well as in four-wheeled and two-wheeled vehicles and industrial machinery. No matter how harsh the usage environment, this product demands safety and reliability. It continues to evolve not only in terms of 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 specialized tools ■ Standalone Component: Simplifies parts management and prevents installation errors ■ Heat and Cold Resistance: Made entirely of metal, excellent in heat and cold resistance 【Customer Feedback】 By using the U-NUT for shackle fastening, we were able to eliminate the traditional work of inserting a cotter pin, confirming an improvement in fastening work efficiency. This led to a reduction in construction days and a decrease in maintenance costs. *For more details about the "U-NUT," please download the PDF or feel free to contact us.
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basic information
Exhibition Participation Information 【EE Tohoku '26】 Dates: June 3, 2026 (Wednesday) 10:00 AM - 4:30 PM June 4, 2026 (Thursday) 9:30 AM - 4:00 PM Venue: Yume Messe Miyagi (3-1-7 Minato, Miyagino-ku, Sendai City, Miyagi Prefecture) Main Exhibition Hall, Outdoor Exhibition Area, West Exhibition Hall, Main Conference Hall Booth Number: D-701 【Features of the U-NUT Lock Nut】 ■ Easy to install ■ Heat resistant ■ Prevents early detachment ■ Various shapes ■ Abundant sizes ■ Custom production available *For more details, please refer to the PDF document or feel free to contact us.
Price range
Delivery Time
※The delivery date may vary depending on the quantity, so please feel free to contact us.
Applications/Examples of results
【Delivery Examples】 ■ Bridge Collapse Prevention Device ■ Temporary Road Installation Work ■ Soundproof Walls and Decorative Panels ■ Seismic Isolation Devices for Buildings ■ Rail Fastening Devices ■ Marine Engines ■ Motorcycle Rear Suspension ■ Large Blowers ■ Stainless Steel Valves
catalog（2）
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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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| CU_SUS | sldprt data |
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| U_SC | IGS data |
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| U_SC | sldprt data |
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| FUN_SS | sldpr 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 attachment_SS | sldprt data |
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| Seat cushion with payment_SS | IGS data |
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| Seat with metal base_SUS | 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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News about this product（1）
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.
