マルナカ List of Products and Services

The "W-V-LOCK Yurumanzō New Model" employs a ratchet mechanism between the bolt, nut, and washer, and additionally features protrusions on the bottom surface of the washer that bite into the workpiece, successfully eliminating loosening almost permanently. This product is a new type of "W-V-LOCK Yurumanzō," specifically a hex socket bolt (small diameter cap bolt) type. 【Features】 ■ The bolt and washer are connected using a ratchet system, with several protrusions on one side of the seating surface. ■ The protrusions bite into the fastened object in a wedge shape, preventing the washer from rotating. ■ It does not loosen even under strong vibrations or long-term use. ■ If removal of the screw is necessary, it can be detached by applying a slightly higher loosening torque than the tightening torque. *For more details, please refer to the PDF document or feel free to contact us.

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The "Yurumanzo (W-V-LOCK)" is a safety bolt and nut that successfully eliminates loosening permanently by adopting a ratchet mechanism between the bolt, nut, and washer, and by incorporating protrusions on the bottom surface of the washer that bite into the workpiece. All five units tested in the vibration loosening comparison test conducted by the Japan Quality Assurance Organization passed without any loosening for over 17 minutes. 【Features】 ■ The bolt and washer are connected using a ratchet mechanism, with several protrusions on one side of the seating surface. ■ The protrusions bite into the clamped object in a wedge shape, preventing the washer from rotating and providing a loosening prevention effect for the entire screw. ■ No loosening occurs even under strong vibrations or long-term use. ■ A high safety and durability loosening prevention mechanism for screws. ■ Patent obtained. *For more details, please request materials or view the PDF data from the download section.

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The "Yurumanzo (W-V-LOCK)" is a safety bolt and nut that successfully eliminates loosening permanently by employing a ratchet mechanism between the bolt, nut, and washer, and by incorporating protrusions on the bottom surface of the washer that bite into the workpiece. All five units tested in the vibration loosening comparison test conducted by the Japan Quality Assurance Organization passed without any loosening for over 17 minutes. 【Features】 ■ The bolt and washer are connected using a ratchet system, with several protrusions on one side of the seating surface. ■ The protrusions bite into the tightened object in a wedge shape, preventing the washer from rotating and providing a loosening prevention effect for the entire screw. ■ No loosening occurs even under strong vibrations or long-term use. ■ A high safety and durability loosening prevention mechanism for screws. ■ Patent obtained. * For more details, please request documentation or view the PDF data available for download.

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The "Yurumanzo (W-V-LOCK)" is a safety bolt and nut that successfully eliminates loosening permanently by employing a ratchet mechanism between the bolt, nut, and washer, and by incorporating protrusions on the bottom surface of the washer that bite into the workpiece. All five units tested in the vibration loosening comparison test conducted by the Japan Quality Assurance Organization passed without loosening for over 17 minutes. 【Features】 ■ The bolt and washer are connected using a ratchet system, with several protrusions on one side of the seating surface. ■ The protrusions bite into the clamped object in a wedge shape, preventing the washer from rotating, thereby providing a loosening prevention effect for the entire screw. ■ Does not loosen even under strong vibrations or long-term use. ■ A loosening prevention mechanism with high safety and durability. ■ Patent obtained. *For more details, please request materials or view the PDF data from the download. *If you would like a sample, please contact us.

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The "Yurumanzo (W-V-LOCK)" is a safety bolt and nut that successfully eliminates loosening permanently by adopting a ratchet mechanism between the bolt, nut, and washer, and further incorporating protrusions on the bottom surface of the washer that bite into the workpiece. All five units tested in the vibration loosening comparison test conducted by the Japan Quality Assurance Organization passed without loosening for over 17 minutes. 【Features】 ■ The bolt and washer are connected using a ratchet mechanism, with several protrusions on one side of the seating surface. ■ The protrusions bite into the fastened object in a wedge shape, preventing the washer from rotating and providing a loosening prevention effect for the entire screw. ■ No loosening occurs even under strong vibrations or long-term use. ■ A high safety and durability loosening prevention mechanism for screws. ■ Patent obtained. *For details, please request materials or view the PDF data from the download. *If you would like a sample, please contact us.

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