Precision lock nut of the pre-bleeding torque type.
"TWIN FU-NUT" is a precision lock nut of the pre-breling torque type. With two friction rings (special springs), it further enhances the anti-loosening performance of the "FINE U-NUT." By simultaneously machining the screw and the seating surface, the runout accuracy of the seating surface relative to the screw is secured to the 1,000 micrometer range (mm). This product, which combines high runout accuracy and anti-loosening functionality, maintains precise bearing rotation at all times. 【Features】 ■ Precision lock nut of the pre-breling torque type ■ Enhanced anti-loosening performance of the FINE U-NUT ■ Tightening is completed simply by tightening the nut ■ Reusable ■ Screw accuracy is ISO4H *For more details, please refer to the PDF document or feel free to contact us.
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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 - Confirm that the friction ring has made contact with the end of the shaft. ■Step 4 - Use the dedicated tightening tool for the FINE U-NUT. (It can also be installed with a hook spanner.) ■Step 5 - Hold the shaft part of the ratchet handle and gently turn to tighten. ■Step 6 - Check whether the inner ring of the bearing is in close contact with the seating surface of the TWIN FU-NUT, and whether the threaded part of the shaft extends more than 2 pitches from the friction ring. *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】 ■Automatic Segiri Processing Machine ■Sugarcane Harvester *For more details, please refer to the PDF document or feel free to contact us.
catalog（1）
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CAD data（64）
| Model number | overview | File |
|---|---|---|
| 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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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.