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  1. Home
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  3. 日本プララド
  4. Bolt tensioner, ArmorMax protection for hydraulic nuts (super hard surface treatment)
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  • Nov 14, 2025
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Nov 14, 2025

Bolt tensioner, ArmorMax protection for hydraulic nuts (super hard surface treatment)

日本プララド 日本プララド
■ ArmorMax: Enhanced Durability with Ultra-Hard Surface Treatment Our proprietary ArmorMax features a specially developed ultra-hard surface treatment. With a high-strength surface finish, it is resistant to scratches, wear, and corrosion, making it a "bolt tensioner with significantly improved durability." ■ Improved Fatigue Strength with ArmorMax Protection Metal fatigue, which occurs when repeated loads cause tiny scratches on the metal surface that lead to crack propagation, reduces lifespan. ArmorMax protection retains compressive surface stress that counteracts this, significantly increasing fatigue strength and providing crack suppression for a longer lifespan. ■ Enhanced Wear Resistance ArmorMax is treated with an ultra-hard surface that is resistant to scratches and marks. With high surface hardness and low friction coefficient, it not only improves wear resistance and fatigue strength but also reduces sliding wear, preventing damage to bolt tensioners and hydraulic nuts, thus extending their lifespan. ■ Improved Corrosion Resistance In neutral salt spray tests for corrosion resistance (over 800 hours), ArmorMax demonstrates superior corrosion resistance compared to other metal surface treatments like zinc plating and nickel plating, offering more than three times the rust prevention effect of standard black oxide treated bolt tensioners and hydraulic nuts. Japan Plarad Co., Ltd.
Bolt tensioner, ArmorMax protection for hydraulic nuts
Bolt tensioner, ArmorMax protection for hydraulic nuts
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Product Features of Bolt Tensioners | Japan Plarad

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High-precision bolt tensioner and axial force management tool | Japan Prarad

High-precision axial force management tool for large bolts from M20 to M300. Allows simultaneous parallel tightening of bolts, ensuring uniform tightening without variation in axial force!

- Supports large bolt tightening from M20 to M300. (Custom production possible from M16.) - Multiple bolts can be tightened simultaneously and uniformly in parallel by connecting bolt tensioners. The tightening axial force is uniform, preventing uneven tightening of flanges. (There is a record of simultaneously tightening 40 flange bolts in parallel.) - Bolts are pulled using hydraulic force, applying tensile load for tightening, which eliminates the influence of friction with the thread surface and seating surface. "Axial force can be managed directly," allowing for more accurate tightening through axial force management than torque management. - Features our unique ArmorMax protection with a super-hard surface finish. Excellent durability, wear resistance, and corrosion resistance maximize the lifespan of the tool. - The compact and lightweight bolt tensioner allows for bolt tightening even in confined spaces. Custom production is also possible. - Since the bolts are not twisted, there is no generation of friction heat, preventing galling between the nut and flange surface and seizing of the threaded parts. <For inquiries about purchasing or renting bolt tensioners> Please contact us for free demos, quotes, and material requests. Nihon Purarado Co., Ltd. TEL: 078-967-3556

  • Hydraulic Equipment
  • Torque wrench
  • Other work tools

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Multi-stage bolt tensioner (for wind power generation) - Nippon Pralado

In addition to bolt tightening work for wind power generation, this is a slim large bolt tightening axial force management tool that can be used in narrow spaces, suitable for M24 to M64 sizes. It features a built-in automatic return spring for added safety.

■ Equipped with an automatic return spring to prevent forgetting to reset to zero, ensuring safety and improving work efficiency by eliminating the need to return the puller to zero stroke each time. ■ The two-stage piston design makes the main body slim, suitable for tightening bolts in narrow spaces, and delivers high tension for tightening force. ■ The gearbox is designed for quick nut seating with a ratchet wrench. ■ Long lifespan, designed for a minimum of over 10,000 pressure cycles. ■ The drive socket features a spring-loaded snap-down structure for quick installation onto the nut. ■ No alignment is needed when attaching to the nut. ■ A tightening tool for axial force suitable for narrow space blade bolt tightening, nacelle frame bolts, hub bolts, and foundation anchor bolts for offshore and onshore wind power construction. ■ Also effective for tightening large bolts from M24 to M64 for applications other than wind power. <For inquiries regarding the purchase or rental of bolt tensioners> Please contact us for free demos, quotes, and material requests. Nihon Purarado Co., Ltd. TEL: 078-967-3556

  • Hydraulic Equipment
  • Torque wrench
  • Other work tools

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Hydraulic nut (lock type)

No tools needed! The hydraulic nut can tighten 40 flange bolts simultaneously! Since it tightens with uniform force at the same time, the bolt axial forces do not vary.

■ The hydraulic nut can tighten 40 flange bolts simultaneously at once! ■ The hydraulic nut is a revolutionary nut that tightens bolts by pulling them with the hydraulic function of the nut body! The nut itself tightens the bolt. ■ Since the nut is tightened by pulling force without twisting, there is no frictional influence with the seating surface, allowing for precise application of axial force directly to the bolt. ■ It tightens multiple bolts simultaneously and uniformly, preventing variation. ■ Because it pulls and tightens the bolt hydraulically, it does not damage the surface of the flange or the seating surface of the nut. ■ Tightening through axial force management achieves higher precision than torque management due to the absence of frictional influence. ■ It accommodates large bolt tightening from M20 to M300 class. ■ There is also a stainless steel version of the hydraulic nut with anti-corrosion specifications. <For inquiries about purchasing hydraulic nuts> Please contact us for free demos, quotes, and requests for materials. Nihon Purarado Co., Ltd. TEL: 078-967-3556

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  • Hydraulic Equipment
  • Other work tools

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Related catalog(1)

Armor Max protection for bolt tensioners (super hard surface treatment)

Armor Max protection for bolt tensioners (super hard surface treatment)

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Fukuda's leak test, leak inspection, leak detection, leak test, integrity test.

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Fukuda Co., Ltd. has been pursuing leak detection for 60 years and is committed to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing properties. We will propose the appropriate testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Jun 29, 2026

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Hotron Group Case Page

[Case Study] Hotron pursues sensor technology and creates products that generate safe and comfortable living spaces. We would like to introduce Hotron products that support people's lives throughout the city.

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We will introduce the implementation results of the sensor technology developed by the Hotron Group, which has been cultivated over more than half a century, through customer case studies. In addition to automatic door sensors, we also offer a wide range of vehicle detection sensors and nursing/care sensors. Many implementation examples are also presented, so please take a look at the case study page.

Jun 29, 2026

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Please take a look at the technical document for the leak test, the "Technical Manual"!

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Fukuda Co., Ltd., which develops, manufactures, and sells leak testing equipment to inspect airtightness and sealing performance, provides a technical document that clearly explains the methods and theories of airtight testing, titled "Technical Manual." We are offering it as a PDF file. Please take this opportunity to download and view it!

Jun 29, 2026

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Hyper CLT flooring panel

Civil CLT as common temporary works for public construction | Hyper CLT flooring

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In public construction civil engineering sites, there are many instances where sheets are used as common temporary facilities, such as construction roads, access roads, heavy machinery work yards, material storage areas, and worker pathways. Traditionally, steel plates were common, but due to their weight, transportation and installation can be cumbersome. Hyper CLT sheets are civil engineering materials made from wooden CLT for civil engineering use. The 5×10 sheet weighs about 230 kg, and the 5×20 sheet weighs about 460 kg, making them lightweight and easy to transport, install, and remove, even with small machinery. They can be widely utilized for temporary roads, heavy machinery scaffolding, pathways within the site, and protection of material storage in public works. Since they are made of wood, they also contribute to environmental aspects such as reducing summer heat reflection, lowering noise, and fixing CO2. They can simultaneously address construction efficiency, safety measures, and environmental considerations, making them effective for innovative proposals in public works. Furthermore, they improve transportation efficiency and reduce labor in site operations as an alternative to steel plates. Hyper CLT sheets are registered technology with the Ministry of Land, Infrastructure, Transport and Tourism under NETIS "TH-250021-A." They are recommended for companies considering civil engineering, civil engineering use, and civil engineering CLT. Feel free to request materials or consult about implementation. They are temporary materials that also help improve site evaluations in public works. Please consider them.

Jun 28, 2026

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[YouTube Update] Differences in Cleansing Ingredients You Should Know Before Developing an Original Shampoo

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We have released a new video on our company’s YouTube channel. The theme of this video is "The World of Amino Acid-Based Shampoos." Amino acid-based shampoos have become popular in recent years, but the lather, feel, and finish can vary greatly depending on the cleansing ingredients used. In this video, we clearly explain the changes in user experience based on the differences in cleansing ingredients by comparing two types of amino acid-based shampoos. We hope you can use this as a hint for developing original shampoos and differentiation.

Jun 26, 2026

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