A nut that can tighten a large bolt with "1/100 of a small torque."
A nut that can be tightened with "1/100 of a small torque" without using electricity or air. Even with an M100 bolt, the tightening torque is only 200Nm. It can be tightened with just one torque wrench. A nut that does not loosen due to a patented structure with a special sloped disc. ■ M30 bolt: 1/42 of the standard torque = required tightening torque 30Nm ■ M56 bolt: 1/107 of the standard torque = required tightening torque 80Nm ■ M100 bolt: 1/260 of the standard torque = required tightening torque 200Nm ■ Features of the tension nut When tightening large bolts from M30 to M100, the tightening torque can reach several thousand to tens of thousands of Nm, requiring large hydraulic or electric tools. The tension nut allows for easy tightening of large bolts using only a hand torque wrench by tightening the Hertz screw. No more large tools or equipment are needed. ■ Tension nut that absolutely does not loosen (international patent obtained) The Plarado tension nut is ideal for machines with vibrations due to its anti-loosening effect. The special structure of the "sloped disc" generates higher axial force the more force is applied in the reverse direction that tries to loosen it, resulting in an even tighter fit.
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basic information
■ Bolt Tightening Axial Force Management By managing the axial force, bolt tightening can be performed with higher precision than torque management, without the influence of friction. ■ No Bolt Seizing or Galling Instead of tightening the bolt by turning it, the bolt is tightened by applying tensile force through the tightening of small Hertz screws, which prevents the generation of friction heat, thus "no bolt seizing or galling occurs." Therefore, tension nuts are particularly suitable for large bolt tightening of M30 and above. ■ Awarded the "Excellence in New Technology and New Products Award for Small and Medium Enterprises" The "Tension Nut" from Nippon Pralado received an award at the "36th Excellence in New Technology and New Products Award for Small and Medium Enterprises," organized by the Resona Small and Medium Enterprise Promotion Foundation and Nikkan Kogyo Shimbun. ■ High-Temperature Resistance up to 280°C It can be used in high-temperature environments, such as pressure vessels, up to 280°C. ■ Custom Specifications Manufacturing Available We also accept manufacturing of bolt sizes other than those listed below, including inch threads, fine threads, and custom specifications.
Price range
Delivery Time
※Sizes that are out of stock will be produced 45 days after the order.
Applications/Examples of results
General tightening of large bolts from M30 to M300. Used for the large bolt tightening of various industrial machines such as tie rod bolts of injection molding machines, presses, generators, pressure vessels, compressors, reciprocating compressors, gear reducers, and vibration testing machines. <Contact for inquiries about tension nuts> Nihon Purarado Co., Ltd. TEL: 078-967-3556
Detailed information
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Tension nut
Line up（16）
| Model number | overview |
|---|---|
| M30TY×P3.5-H6 Tension Nut | Bolt diameter M30, maximum axial force 210kN, tightening input torque 30Nm |
| M30TY×P3.5-H8 Tension Nut | Bolt diameter M30, maximum axial force 270kN, tightening input torque 30Nm |
| M33TY×P3.5-H8 Tension Nut | Bolt diameter M33, maximum axial force 270kN, tightening input torque 30Nm |
| M36TY×P4-H8 Tension Nut | Bolt diameter M36, maximum axial force 410kN, tightening input torque 50Nm |
| M39TY×P4-H10 Tension Nut | Bolt diameter M39, maximum axial force 530kN, tightening input torque 50Nm |
| M42TY×P4.5-H12 Tension Nut | Bolt diameter M42, maximum axial force 610kN, tightening input torque 50Nm |
| M45TY×P4.5-H10 Tension Nut | Bolt diameter M45, maximum axial force 740kN, tightening input torque 80Nm |
| M48TY×P5-H10 Tension Nut | Bolt diameter M48, maximum axial force 740kN, tightening input torque 80Nm |
| M52TY×P5-H12 Tension Nut | Bolt diameter M52, maximum axial force 890kN, tightening input torque 80Nm |
| M56TY×P5.5-H12 Tension Nut | Bolt diameter M56, maximum axial force 890kN, tightening input torque 80Nm |
| M60TY×P5.5-H10 Tension Nut | Bolt diameter M60, maximum axial force 1250kN, tightening input torque 200Nm |
| M64TY×P6-H10 Tension Nut | Bolt diameter M64, maximum axial force 1250kN, tightening input torque 200Nm |
| M68TY×P6-H12 Tension Nut | Bolt diameter M68, maximum axial force 1480kN, tightening input torque 200Nm |
| M72TY×P6-H12 Tension Nut | Bolt diameter M72, maximum axial force 1480kN, tightening input torque 200Nm |
| M76TY×P6-H16 Tension Nut | Bolt diameter M76, maximum axial force 2000kN, tightening input torque 200Nm |
| M80TY×P6-H16 Tension Nut | Bolt diameter M80, maximum axial force 2000kN, tightening input torque 200Nm |
News about this product（1）
Company information
Plarad is a specialized manufacturer of hydraulic torque wrenches, boasting the oldest history and tradition in the world (since 1962). The design and manufacturing of all hydraulic torque wrenches began with Plarad. As a pioneer, it has developed many patented technologies and high-precision hydraulic torque wrenches, electric torque wrenches, air torque wrenches, and bolt tensioners specifically for large bolt tightening, which are used in various industrial sectors worldwide. It offers a lineup of tools ranging from 50 Nm to one of the largest tightening torques in the world at 500,000 Nm. - Awarded the Germany TOP 100 Innovators Award. - As a leading company in hydraulic torque wrenches and bolt tensioners, it supplies hydraulic tools for large bolt fastening systems capable of torque management and axial force management to Japan and the world. - Engaged in manufacturing, sales, and rental business. - Plarad hydraulic torque wrenches have numerous delivery records, including the Tokyo Skytree, Abeno Harukas, the world's largest shield machine, the world's largest wind turbine at 8.0 MW, the world's longest high-speed tunnel, the linear Shinkansen, Boeing 787, and JAXA Tanegashima Space Center. - Certified with international standards ISO 9001 and ISO 14001.