Prevailing PrevailingTorque TorqueType Type

The industry standard for lock nuts that ensure dependable fastening solutions

The FUJILOK U-NUT Technology With over 50 years of history. The FUJILOK U-NUT is now highly regarded as the first name in locknuts across all industries from steel structures such as railways and connecting bridges to automobiles, motorcycles, and on up to industrial machines. No matter how harsh the use environment is, the FUJILOK U-NUT which is required for safety and peace of mind is the definitive version of the locknut which continues to evolve in terms of durability, vibration resistance, etc. as well as locking performance. ●Flange Type ●Weld Type ●Whit Thread Type ●Unified Thread Type...

As a leader in the locknut industry The FUJILOK U-NUT was a groundbreaking locknut introduced by Fuji Seimitsu as the first in the industry to feature a metal ring locking function. The FUJILOK U-NUT sparked a revolution in the area of bolts and nuts where up until that point loosening had been considered unavoidable. With over 50 years of history The FUJILOK U-NUT is now highly regarded as the first name in locknuts across all industries from steel structures such as railways and connecting bridges to automobiles, motorcycles, and on up to industrial machines. Stress (P) produced through the...

The industry's first [metal ring locking function] The FUJILOK U-NUT consists of a nut and friction ring (specialized spring). The friction ring is secured to and integrated with the top face of the nut by crimping. When the bolt is screwed in, the friction ring begins to bend, and presses against the bolt thread. Stress produced through a spring effect and the prevailing torque (friction torque) caused by a reaction force that presses against the bolt thread are produced. Tighten in the same way as The friction ring touches an ordinary nut the bolt thread. Prevailing torque is produced by the...

In every facet of life Public works Seismic Reinforcement To ensure safety Back side Acoustical Board Sound Insulation Wall For construction in high/narrow areas For the prevention of the falling of parts For construction in high/narrow areas Transmission Towers Solar Panels Shipbuilding

The majority of products in the FUJILOK U-NUT series were created based on customer needs for safety and security. As a wide range of industries including motorcycles, industrial machinery, and steel structures advance and develop we believe that the safety needed to keep pace with these advances requires maintaining a high level of safety at all times. With a strong awareness that we are providing safety and security to our customers, we will continue to make advances to the FUJILOK U-NUT and other Fuji Seimitsu products. Exterior Panels Prevention of the falling of parts Destination Display...

The true strengths of the FUJILOK U-NUT verified by a variety of testing Testing and measurement equipment that verifies safety from a variety of aspects. NAS Conforming High- Speed Thread Looseness Tester Threaded Fastener Tightening Characteristic Testing Unit This machine is produced to conform to NAS3350 (U.S. National Aerospace Standard) tester specifications, and is used for judgement and comparison of locking performance. This machine conforms to JIS B 1084 (Fasteners-Torque/clamp force testing), and is used for measuring characteristic values resulting from tightening. Capable of observations...

Vertical Axis Vibration Test Junker Type Thread Loosening Testing Machine (according to DIN 65151) This test repeatedly applies amplitude and impact in a direction vertical to the axis of the bolts and nuts that are assembled in a vibration plate in order to examine the reduced axial tension of the fastener and judge the locking performance. Specification of the Junker Type Thread Loosening Testing Machine Test Condition Frequency of the vibration plate Sample size Material of the sample nut, bolt Vibration time Axial tension for fastening 17150 N {1750 kgf} Yield point of Bolt δy: 314 N/mm²...

A groundbreaking locknut introduced by Fuji Seimitsu as the first in the industry. With over 50 years since the birth. The FUJILOK U-NUT is now highly regarded as the first name in locknuts across all industries from steel structures such as railways and connecting bridges to automobiles, motorcycles, and on up to industrial machines. No matter how harsh the use environment is, the FUJILOK U-NUT which is required for safety and peace of mind is the definitive version of the locking nut which continues to evolve in terms of durability, vibration resistance, etc. as well as locking performance....

Thin Type Thin Type Single Chamfer Double Chamfer Single Chamfer Double Chamfer Thread Accuracy: ISO6H (JIS6H) Unit: mm Material of the Friction Ring Unit Weight * Thin type (h1) mentioned is available. *Please confirm the shape on single or double chamfer. * Please check the stock condition of each size. * The material also includes items with equivalent materials. * Dimensions may change for improvement.

• : Available Thread Accuracy: ISO6H (JIS6H) Unit: mm * Please check the stock condition of each size. * The material also includes items with equivalen materials. * Dimensions may change for improvement. Brake Levers Tractors Motorcycle Side Kickstands

• The appearance can be improved by covering the bolt with a cap. • By covering the bolt, we can obtain excellent corrosion resistance and safety. FUJILOK U-NUT • : Available Thread Accuracy: ISO6H (JIS6H) Unit: mm * Please check the stock condition of each size. * The material also includes items with equivalent materials. Dimensions may change for improvement. Introduction of Applications Fall Prevention Devices Washing Machines Exterior Panels

Flange Type U-NUT Features • No washer is needed so it can improve work efficiency. • Can achieve stable locking performance. • Can reduce the number of parts. • The appearance can be improved by the FUJILOK U-NUT with integrated washer. : Available Material of the Nut Body Width Across Flat (s) SUS301 Diameter of Flange Counter Bores Thickness Property Class (ødb) (c) Base Tolerance MIN 6T 8T 0.6  Thread Across Depth of Height Corners Counter (m) (e) Bores (b) Tolerance Approx. Approx. 4.2 8.1 Flange Diameter (ødc) Tolerance Material of the Friction Ring Nominal Diameter (d) Friction Ring...