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[Technical Information] Basic Knowledge of Understanding Loosening: Proper Tightening of Screws

[Technical Information] Basic Knowledge of Understanding Loosening: Proper Tightening of Screws

When tightening bolts, it is important to select the appropriate strength class and friction coefficient that match the target bolt axial force!

To perform safe screw fastening, sufficient initial tightening force F is required, and for that, it is necessary to tighten with an appropriate tightening torque T. The characteristics of the tightening methods for screw fasteners can be broadly divided into two categories: elastic region tightening and plastic region tightening. Therefore, when fastening bolts, it is important to select the appropriate strength classification (yield stress) and friction coefficient that correspond to the target bolt axial force. Thus, to perform proper screw tightening, it can be said that it is essential to have a good understanding of the friction coefficient, which greatly influences the tightening torque and initial tightening force. [Tightening Methods for Screw Fasteners] ■ Elastic Region Tightening: Tightening within the range where the bolt does not yield ■ Plastic Region Tightening: Tightening within the range where the bolt yields and reaches the limit tightening axial force *For more details, please refer to the PDF document or feel free to contact us.

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[Technical Information] About the Structure of Screws

[Technical Information] About the Structure of Screws

We will provide detailed information about commonly used metric threads for fastening, including diagrams and tables.

In the fastening of mechanical structures (screw fasteners), screws are important components. They can be removed when necessary. The ability to repair mechanical structures and reuse them is a key feature. According to the screw fastening general rules (JIS B 1083:2008), screw fastening is defined as the method or state of joining two or more items by fitting the threaded part of a bolt with the nut or the internally threaded part formed in the item, and tightening the screw. A screw fastening assembly is defined as the entire structure with a screw fastening part or a part of the structure that includes the screw fastening part. Our technical information site "Screw Fastening Technology Navigation," which contributes to solving screw fastening challenges, provides detailed information about "the structure of screws." Please take a look through the related links. *For more details, please feel free to contact us.

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[Technical Information] About Tightening Stress

[Technical Information] About Tightening Stress

I will introduce tensile stress σ and shear stress τ!

When tightening bolts and nuts, the points to be aware of regarding the relationship between the tightening torque and axial force in the threaded joint can be broadly categorized into the following two points: (1) When the tightening torque is too high relative to the strength of the bolt and nut. (2) When the tightening torque is too low relative to the strength of the bolt and nut. Our technical information site "Screw Fastening Technology Navi," which contributes to solving issues related to screw fastening, confirms the stresses that occur inside the bolt during fastening and addresses the issue of screw failure when the tightening torque is too high, providing detailed information on this topic. Please take a look at the related links. *For more details, please feel free to contact us.

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[Technical Information] On Metal Damage: "Corrosion"

[Technical Information] On Metal Damage: "Corrosion"

We will provide a detailed introduction to general corrosion, pitting corrosion, and galvanic corrosion!

The main forms of corrosion include "uniform corrosion, pitting corrosion, and galvanic corrosion." Other types of corrosion include "crevice corrosion," which occurs due to the formation of an oxygen concentration cell in tiny gaps on the order of microns, "grain boundary corrosion," where the grain boundaries preferentially corrode, "erosion corrosion," which involves the action of wear by fluids, and "high-temperature oxidation," which occurs in high-temperature atmospheres or steam. Our technical information site "Screw Fastening Technology Navi," which contributes to solving issues related to screw fastening, features the three main forms of corrosion (uniform corrosion, pitting corrosion, and galvanic corrosion). Please take a look through the related links. [Contents] ■ Main forms of corrosion - Uniform corrosion - Pitting corrosion - Galvanic corrosion ■ Special types of corrosion cracking - Stress corrosion cracking - Hydrogen embrittlement cracking *For more details, please feel free to contact us.

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Basic knowledge of screws, including technical information on fastening and loosening.

Basic knowledge of screws, including technical information on fastening and loosening.

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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Reduction of man-hours without the need for tongue-type washers: Lock nuts for single hexagonal bearings.

Reduction of man-hours without the need for tongue-type washers: Lock nuts for single hexagonal bearings.

No need to bend the troublesome tongue-shaped washer onto the lock nut at all! Hexagonal single type.

The "SLB Space Lock Bearing Nut" is a powerful return-stop lock nut with a hexagonal shape and pre-loading torque type. It is a groundbreaking product that does not damage the threads of the bolt during tightening and maintains its return-stop function even after reuse. Since it can maintain the appropriate initial preload for a long time, it prevents various damages to bearings caused by a decrease in rigidity. 【Features】 ■ Maintains strong return-stop effect even after reuse ■ Can be reused without damaging the threads, even on shafts with keyway machining ■ Hexagonal shape makes tightening easy and efficient ■ Thread strength is twice that of standard lock nuts ■ Good balance of the nut's center of gravity *For more details, please refer to the related links or feel free to contact us.

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