Locking nut with over 40 years of proven performance for bearings.
The "FINE U-NUT" is a locking nut for bearings that eliminates the need for traditional keyway machining of shafts and the installation of toothed washers. It allows for arbitrary and appropriate positioning, and torque management is also easy. It generates "power" in various industrial machines and improves the rotational balance of bearings. Additionally, it has achieved a reduction in rotational loss of equipment and a decrease in power consumption. 【Features】 ■ Reusability: Can be reused ■ Easy fastening: No skilled techniques required ■ Labor-saving simplification: No keyway machining of shafts needed ■ Balance: Improved rotational balance of shafts and bearings ■ Lightweight: Can use thinner hollow shafts than before ■ Cost reduction: No need for traditional machining, parts, or techniques *For more details, please refer to the PDF document or feel free to contact us. *CAD data is also available for download.
Inquire About This Product
Related Videos
basic information
【Installation Procedure】 ■Step 1 - Pass the bearing through the shaft. - Confirm that the end of the threaded part of the shaft has been chamfered (equivalent to 1 pitch) before applying lubricant. ■Step 2 - Manually screw in until the friction ring contacts the threads of the shaft. ■Step 3 - Use the dedicated tightening tool for the FINE U-NUT. (It can also be installed with a hook spanner.) ■Step 4 - Hold the shaft part of the ratchet handle and gently turn to tighten. ■Step 5 - Check if the inner ring of the bearing is in close contact with the seating surface of the FINE U-NUT, and whether the threaded part of the shaft protrudes more than 2 pitches from the friction ring. - When removing, unscrew with the tightening tool until the friction ring is free from the threads of the shaft. *For more details, please refer to the PDF document or feel free to contact us.
Price information
Please contact us.
Delivery Time
Applications/Examples of results
【Case Studies】 ■ Semiconductor Automatic Sealing Device ■ Ball Screw ■ Food Machinery ■ NC Rotary Table ■ Pump ■ NAS Type High-Speed Screw Loosening Test Machine ■ Spindle ■ Small Molded Part Extraction Robot ■ Cold Press Machine ■ Digital Panorama X-ray Imaging Device ■ Drill Machine for Shaped Steel ■ Welding Robot for Automobiles *For more details, please refer to the PDF materials or feel free to contact us.
catalog（1）
Download All Catalogs
CAD data（64）
| Model number | overview | File |
|---|---|---|
| FUN_SS | IGS data |
|
| FUN_SC | IGS data |
|
| FUN_SUS | IGS data |
|
| FUN_SS | sldpr data |
|
| FUN_SC | sldpr data |
|
| FUN_SUS | sldpr data |
|
| CU_SS_Molten Zinc Coating | IGS data |
|
| CU_SUS | sldprt data |
|
| U_SC | IGS data |
|
| U_SC | sldprt data |
|
| BLU_SUS | IGS data |
|
| BLU_SUS | sldprt data |
|
| GU_SS | IGS data |
|
| GU_SS | sldprt data |
|
| SU_SUS | IGS data |
|
| SU_SUS | sldprt data |
|
| TFU_SC | sldprt data |
|
| TFU_SC | IGS data |
|
| WU_SC | sldprt data |
|
| WU_SC | IGS data |
|
| WU_SS | sldprt data |
|
| WU_SS | IGS data |
|
| WU_SUS | sldprt data |
|
| U_SS | IGS data |
|
| U_SS | sldprt data |
|
| U_SUS | IGS data |
|
| U_SUS | sldprt data |
|
| U_3 types_SC | sldprt data |
|
| U_3 types_SC | IGS data |
|
| U_3 types_SS | sldprt data |
|
| U_3 types_SS | IGS data |
|
| U_3 types_SUS | sldprt data |
|
| U_3 types_SUS | IGS data |
|
| FLANGE_SUS | IGS data |
|
| UNC_SC | sldprt data |
|
| UNC_SC | IGS data |
|
| UNC_SS | sldprt data |
|
| UNC_SS | IGS data |
|
| WU_SUS | IGS data |
|
| WELD_SS | sldprt data |
|
| WELD_SS | IGS data |
|
| CAP_SS | sldprt data |
|
| CAP_SS | IGS data |
|
| CAP_SUS | sldprt data |
|
| CAP_SUS | IGS data |
|
| FLANGE_SC | sldprt data |
|
| FLANGE_SC | IGS data |
|
| FLANGE_SUS | sldprt data |
|
| Small U_SC | sldprt data |
|
| Small U_SC | IGS data |
|
| Small U_SS | sldprt data |
|
| Small U_SS | IGS data |
|
| Small U_SUS | sldprt data |
|
| CU_SS_Molten Zinc Coating | sldprt data |
|
| CU_SUS | IGS data |
|
| FLANGE_SS | sldprt data |
|
| FLANGE_SS | IGS data |
|
| UNC_SUS | sldprt data |
|
| UNC_SUS | IGS data |
|
| Seat cushion with attachment_SS | sldprt data |
|
| Seat cushion with payment_SS | IGS data |
|
| Seat with metal base_SUS | sldprt data |
|
| Seat with metal base_SUS | IGS data |
|
| Small U_SUS | IGS data |
|
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.
![[Case Study] Delivery of ADB Bearings to JAXA (Vacuum Environment)](https://image.mono.ipros.com/public/product/image/2116982/IPROS15371915343153642774.png?w=280&h=280)
![[Case Study] Delivery of ADB Bearings to the Japan Agency for Marine-Earth Science and Technology](https://image.mono.ipros.com/public/product/image/2116982/IPROS5373024613893180027.png?w=280&h=280)
![[Case Study] Delivery of ADB Bearings to the Railway Technical Research Institute](https://image.mono.ipros.com/public/product/image/2116982/IPROS3538816796531318200.png?w=280&h=280)