We have prepared technical materials on screw fastening and loosening in the form of columns, videos, and downloadable documents. This is a site we would like engineers to utilize.
Content Overview 【Loosening of Screws】 Principles/Types/Evaluation/Testing/Countermeasures 【Design and Tightening of Screw Fasteners】 Mechanics/Design of Screw Fasteners/Screw Tightening Methods/Screw Tightening Tools 【About Screws】 Standards/Types and Usage/Materials/Surface Treatment/Strength of Screw Components 【Screw Troubles】 Troubles during Screw Tightening/Troubles after Screw Tightening/Others (Troubles) ↓↓For more details, click here↓↓
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basic information
【Hard Rock Nut Features】 ■ World-recognized anti-loosening effect ■ Torque and axial force management possible ■ Reusable ■ Easy and good workability ■ Contributes to significant cost reduction *For more details, please refer to the PDF document or feel free to contact us.
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For more details, please refer to the PDF document or feel free to contact us.
catalog（2）
Download All Catalogs![Lock Parts "HLS [Hard Rock Set Screw] (R) Catalog"](https://image.mono.ipros.com/public/catalog/image/01/543/445119/IPROS79111561619361849476.jpeg?w=120&h=170)
Company information
Hard Rock Industries is a company that develops, produces, and sells "locking nuts," and it was established in 1974. Our Hard Rock Nuts were created from the strong desire of our founder and technical president, Katsuhiko Wakabayashi, to eliminate accidents caused by loosening screws and to create a safe and secure society. We are still advancing the development and improvement of new anti-loosening products. Our products are used in critical safety locations and areas where maintenance and inspection are challenging. <Main Clients> Railway market (vehicles, tracks, overhead lines, etc.), bridges and highways, transmission towers, construction and civil engineering, plant equipment, industrial machinery, etc.
![[Technical Information] About the Principle of Loosening: Basic Edition](https://image.mono.ipros.com/public/product/image/4d2/2000560043/IPROS54724764275627571407.png?w=280&h=280)
![[Technical Information] How to detect looseness? (NAS Test)](https://image.mono.ipros.com/public/product/image/8bc/2000560044/IPROS47300147668062805210.png?w=280&h=280)
![[Technical Information] How to detect looseness? (Junker Test)](https://image.mono.ipros.com/public/product/image/a55/2000560048/IPROS49152938194157321064.png?w=280&h=280)
![[Technical Information] About the Structure of Screws](https://image.mono.ipros.com/public/product/image/770/2000562715/IPROS32932385204986967550.png?w=280&h=280)
![[Technical Information] On Metal Damage: "Fatigue Fracture"](https://image.mono.ipros.com/public/product/image/c71/2000562861/IPROS37817229320564742766.png?w=280&h=280)
