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  1. Home
  2. Other construction industries
  3. 日本プララド
  4. Released the bolt anti-rotation washer "Tsure Zero Washer".
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  • Nov 11, 2024
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Nov 11, 2024

Released the bolt anti-rotation washer "Tsure Zero Washer".

日本プララド 日本プララド
Nippon Prarado Co., Ltd. has released the "Tsure Zero Washer," a washer designed to prevent the rotation of bolts with diameters ranging from M12 to M72. ■ Features of the Anti-Rotation Washer "Tsure Zero Washer" 1. A washer that prevents bolt rotation Unlike washers that utilize surface irregularities from knurled processing to create friction resistance, the anti-rotation Tsure Zero Washer has a special structure that changes the equivalent friction diameter. It has already been applied for international patent. The conical shape on the back and the hexagonal design increase the effective friction diameter against the seating surface, resulting in the reaction torque from the bolt head being more than twice as large as the tightening torque of the nut. This prevents the washer from rotating and stops the bolt head from rotating together. As the tightening torque of the nut increases, the reaction torque from the bolt head also increases, ensuring that the bolt does not rotate until the tightening is complete. 2. Significant reduction in bolt tightening and loosening time, manageable by one person By simply replacing standard flat washers with the Tsure Zero Washer, there is no need for cumbersome anti-rotation tools or backup wrenches, leading to a substantial reduction in the time required for bolt tightening operations.
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zero-washer.pdf[1978349]

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Bolt Anti-Rotation Washer "Tsure Zero Washer" Japan Pralado
Absolutely no bolt rotation! The anti-rotation Tsure Zero Washer has a special structure that changes the equivalent friction diameter, ensuring that the bolt does not rotate. International patent application filed. For M12 to M72.
Principle of Bolt Anti-Rotation and Tsure Zero Washer
Dimension Table for Bolt Anti-Rotation Tsure Zero Washer for M12 to M72

Related product

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Anti-rotation washer that absolutely prevents the bolt from rotating together - zero friction washer.

Washer for completely preventing the simultaneous rotation of bolts, suitable for M12 to M72.

■ Completely prevents bolt rotation with the "Anti-Rotation Zero Friction Washer" Bolt sizes: Compatible with M12 to M72. International patent applied for. ■ Features of the Plarad Anti-Rotation Zero Friction Washer Prevents hex bolt rotation. ■ Unlike washers that utilize surface irregularities from knurled processing for friction resistance, the Zero Rotation Washer has a special structure that changes the equivalent friction diameter, ensuring that the bolt does not rotate. ■ By simply replacing standard flat washers, there is no need for cumbersome bolt anti-rotation tools or backup wrench tools, significantly reducing the time required for bolt tightening operations. Additionally, the bolt tightening task, which previously required two workers to hold the tightening tool and the anti-rotation tool, can now be done by one person, improving labor efficiency. - Strength classification: 8.8 - Material: S45C - Surface treatment: Trivalent chromate finish <For inquiries about the bolt anti-rotation Zero Friction Washer> Please contact us for quotes and information requests. Plarad Co., Ltd. TEL: 078-967-3556

  • Joining and fastening materials

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bol-2025.png

The strongest lock nut "Bolrock Nut"

A nut that does not loosen even after 1 million vibration tests (3D vertical and horizontal)! Compatible bolt sizes: M14 to M100.

■ Structure and Non-Loosening Principle of the Strongest Lock Nut "Bolrock Nut" 1. When the nut is subjected to vibration and attempts to loosen counterclockwise, the fine internal balls utilize a clutch mechanism to exhibit a wedge effect, preventing the nut from turning and loosening. 2. The slope angle of the internal balls is designed to be larger than the "screw lead angle," which corresponds to one full turn of the screw. 3. When the nut is tightened, the internal balls automatically move to the deepest part of the groove, aligning the bottom of the nut with the top of the balls, eliminating any gap between them and the floor, thus not affecting the tightening axial force. ■ Vibration Test Condition Data - Bolt Diameter: M16 - Bolt and Nut Material: SCM435 - Frequency: 100Hz - Number of Vibrations: 1,000,000 times - Simultaneous 3D vibration in vertical and horizontal directions While competitor lock nuts loosen after 1,100 to 2,300 vibrations, Plarad's Bolrock Nut has withstood 1,000,000 vibrations, proving its overwhelming vibration resistance. <About the Strongest Lock Nut: Bolrock Nut> For inquiries regarding quotes, requests for materials, etc., please contact us. (Company) Nippon Plarad TEL: 078-967-3556

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Notice of Golden Week Holiday Closure from Castem Co., Ltd.

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Thank you very much for your continued patronage. We apologize for the inconvenience, but we will be closed during the following period. 【Closure Period】 From Wednesday, April 29, 2026, to Wednesday, May 6, 2026. Inquiries received during the closure period will be addressed sequentially starting from Thursday, May 7, 2026. We apologize for any inconvenience this may cause and appreciate your understanding. *Orders placed on various online shopping sites will still be accepted during the closure period. *Shipping of products and responses to inquiries will begin after Thursday, May 7, 2026.

Apr 14, 2026

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We have introduced "scent design" at the entrance of a real estate company located in Tokyo.

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At the entrance of a real estate company in Minato-ku, Tokyo, we have introduced the rental service "Majesta Fragrance" for commercial aroma diffusers, creating a fragrant atmosphere in the space. With the new start of the office relocation on April 1st, a high-quality and sophisticated scent suitable for this new beginning is spreading throughout the entrance. The "scent" that visitors first experience is one of the important elements that naturally conveys the company's impression and dignity. At Majesta Fragrance, we support the enhancement of corporate branding value through the production of scents tailored to the spatial concept. We also offer a free trial installation, so please experience the atmospheric effects that scent can bring. If you are interested in scent design, please feel free to contact us.

Apr 14, 2026

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We will be exhibiting at the Thermal Tech 2026 event held on April 24, 2026.

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We will be exhibiting at the Thermal Tech 2026 event held at the Osaka Industrial Creation Center. At this exhibition, we will introduce our unique material technologies to engineers who face challenges in material selection for high-temperature environments, focusing on polyimide sheets suitable for high heat resistance and insulation applications. As attendance is by prior registration, please register through the related link before visiting, and we hope you will stop by our booth. We sincerely look forward to your visit. ◆ Our main exhibition content - PI Plates (Polyimide Laminates) - SUS/Polyimide Substrates ◆ Exhibition Details ◆ Exhibition Name: Thermal Tech 2026 (Pre-registration required) Pre-registration Method: Please register via the URL in the related link Date and Time: April 24, 2026 (Friday) 10:30 AM - 4:30 PM Venue: Osaka Industrial Creation Center, 3rd and 4th Floors (Reception on the 4th Floor)

Apr 14, 2026

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We have released the ZEROSAI X-AI Heat Stroke Prevention Collection for civil engineering and construction.

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From June 2025, measures against heat stroke in the workplace have become mandatory. Additionally, in December 2026, a "Support Package for Heat Wave Measures in Construction Work" was formulated, making heat stroke prevention during the summer a pressing issue, especially for those engaged in the construction industry. This time, we provide a collection of heat stroke prevention materials that can be utilized through Sysmet Co., Ltd.'s comprehensive weather platform, ZEROSAI X-AI. Examples of heat stroke prevention measures possible with ZEROSAI X-AI: - Cloud management of heat stroke information - Forecasting of the heat index (WBGT) tailored to the site with a mesh of 500m for up to 17 days ahead - Observation of the heat index (WBGT) in compliance with JIS standards using a black globe thermometer - Alerts for exceeding work standard values for the heat index (WBGT) via electronic bulletin boards, emails, and business chat tools like direct LINE WORKS We hope this will be useful at your sites as well.

Apr 13, 2026

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The Nabari City Youth Center has been given the nickname "Energy With Hall."

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Energy With Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo, President: Yoshito Ishii, hereinafter referred to as Energy With) has acquired the naming rights for the Nabari City Youth Center located in Nabari City, Mie Prefecture, and began using the name "Energy With Hall" from April 1, 2026. Earlier this month, a new sign for Energy With was installed. About Energy With Hall Facility Overview Address: 1325-1 Matsuzakicho, Nabari City, Mie Prefecture, 518-0721 (Google Maps: https://maps.app.goo.gl/YLh6Dv6D91irLDx79) Phone Number: 0595-64-3478 Fax Number: 0595-64-8321 For more detailed facility information, please see below. Energy With Hall (Nabari City Youth Center (formerly ads Hall)) – Facility Information

Apr 13, 2026

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