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The screw with a locking agent, "Seahorse Lock(R)," is a pre-coated type with a locking agent applied to the screw part, allowing for immediate tightening work as an adhesive-based locking product. It eliminates the hassle, inconsistencies, and forgetfulness of the application process, effectively preventing loosening due to impact and vibration. The locking agents can be broadly categorized into two types: "resistance" and "adhesion," with multiple variations available for each type, allowing for selection based on application needs. This product contributes to reducing the labor involved in the application process and streamlining operations. 【Features】 ■ Eliminates the hassle, inconsistencies, and forgetfulness of adhesive application ■ Customizable types, application ranges, viscosities, and colors of locking agents ■ Supports prototypes, small lots, and short delivery times ■ Specialized engineers are available to assist with specification selection and torque settings using testing equipment *For more details, please download the PDF or contact us directly.
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Free membership registrationOne of the issues troubling manufacturing sites is the detachment of screws used on the production line. Implementing measures to prevent loosening on-site can lead to unnecessary costs, which is a significant burden. In other words, the required measures should not only prevent screw detachment but also ensure that subsequent maintenance is easy, which is also an important factor. *For more details, you can view the related links. Please feel free to contact us for more information.*
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Free membership registrationScrews have grades due to differences in tolerance ranges. However, the old standards are still strongly present in the field, which can lead to troubles during product acceptance. Additionally, if you do not check your company's inspection standards and management gauges and update them with the latest information, there is a possibility that consistency in screw quality may not be maintained. In this column, we will explain the differences between the old and new screw grades and the background of their mixing. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*
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Free membership registrationMany in the manufacturing industry that use screws likely implement torque management based on torque methods. It is common to use a torque wrench to check whether the specified tightening torque value set during the design phase has been reached. However, in reality, torque management alone is insufficient for ensuring reliable bolt fastening. In this column, we will explain the meanings of the terms "torque" and "axial force," which are essential for screw fastening, and their relationship. *For more details on the column, please refer to the related links. Feel free to contact us for more information.*
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Free membership registrationA screw insert is a component that is embedded in buildings, structures, and equipment. Among them, there is a type called a wire insert, which is a part that can reinforce and repair internal threads. However, if a wire insert is used incorrectly, it can become difficult to insert, and in some cases, even with the wire insert in place, it may lead to damage of the internal threads. Here, we will explain the "correct design method for wire inserts." *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*
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Free membership registrationBoth the implant bolts and double-ended bolts have no heads and are products with threads cut on both ends, and they are sometimes thought to be the same product, but in fact, they are different. Recently, I received a consultation stating, "There was a loosening in the double-ended bolt that is securing the machine." It seems that the person was not aware that the effective diameter of the threaded part on the implant side of the implant bolt is slightly thicker, which was the cause of the loosening. If such issues are discovered after mass production, it can lead to serious problems. To prevent this, let's recognize the differences between "implant bolts" and "double-ended bolts." *For more details on the column, you can view it through the related links. For further inquiries, please feel free to contact us.*
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Free membership registrationTapping screws can be fastened by directly screwing them into a pilot hole, which is why they are used in industries such as automotive and home appliances to reduce labor costs. They are convenient screws, but they are also very difficult to select. If tapping screws are not chosen correctly, issues such as screw stripping, boss breakage, screw lifting, and loosening can occur. This column will focus on the types of tapping screws, tightening torque, and how to select the appropriate pilot hole diameter. *For more detailed information, please refer to the related links. Feel free to contact us for more details.*
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Free membership registrationI believe that large-diameter bolts are often used for securing components such as tie rods and cover bolts for pressure vessels. Have you ever experienced a large-diameter bolt breaking? If it breaks, it requires a lot of effort to address the issue, and in some cases, it can lead to machine downtime, resulting in loss costs. In this column, we will explain the causes of large-diameter bolt breakage and the countermeasures using a product called Super Bolt. *For more detailed information, please refer to the related links. Feel free to contact us for more details.
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Free membership registrationWhen manufacturing parts with special-shaped threaded components, how much time do you typically take from drafting to starting production? Is it not the case that after drafting the drawings, you check them, confirm with the factory whether they can be produced, and sometimes receive a notification from the factory that production is not possible, leading to revisions of the drawings, and before you know it, nearly two weeks have passed? In this column, we will focus on the tolerance settings for the length of the threaded part during the drafting of drawings for special-shaped threaded components. *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*
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Free membership registrationRecently, the issue of "lightweighting products" has become important across various industries. Screws are relatively small components in each product, but by adopting "plastic screws," also known as resin screws, further weight reduction can be achieved. However, there are many types of resins, each with different strengths and characteristics. In this column, we will introduce recommended types of resins used for plastic screws from four perspectives: strength, heat resistance, chemical resistance, and cost. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*
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Free membership registrationIf you do not thoroughly understand who will use the drawings, for what purpose, and when, there is a possibility of overlooking mistakes or encountering problems during production. Such oversights can ultimately lead to increased costs in terms of unit price, delivery time, and effort, making it extremely important to accurately interpret the drawings. In this column, I will summarize the role of drawings and the key points to keep in mind when creating or reviewing them. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*
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Free membership registrationThere are two main types of screw processing methods: "rolling processing" and "cutting processing." Each method has its own strengths in terms of shapes and quantities, and it is necessary to select the appropriate processing method based on the desired quality, unit price, and delivery time. In this column, we will explain in detail the differences between the two processing methods. *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*
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Free membership registrationThin sheet components such as spacers and shims used for gap adjustment in precision machinery face various challenges, including burrs and distortions during processing. Of course, there are also issues related to cost and delivery time, so selecting the appropriate processing method is crucial for creating better products. In this column, we will explain the differences between three processing methods, along with their advantages and disadvantages. *For detailed content of the column, please refer to the related link. For more information, feel free to contact us.*
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Free membership registrationDistinguishing between the pitch of screws (coarse and fine) can sometimes go unnoticed when there is little time to pay attention during on-site work, even if they are mixed together. As a countermeasure in such cases, many people take steps to make them easier to distinguish by using head coatings or plating, but the available surface treatments are limited. Therefore, our company has focused on a technology called "oxidation coloring," which is a coloring technique for stainless steel materials. In this column, we will explain the mechanism, features, and applications of oxidation coloring. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*
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Free membership registrationOn this page, we upload discussions about products and methods centered around fastening technology, as well as contributions from experts. We introduce columns such as "Differences between the old and new standards for screw grades" and "The risks of foreign object contamination in food manufacturing lines and their countermeasures." There are categories, tags, and article searches available. Please take a moment to read. 【Contents】 ■ The risks of foreign object contamination in food manufacturing lines and their countermeasures ■ Differences between the old and new standards for screw grades in tolerance classes ■ The unstable relationship between torque and axial force that you should know for bolt fastening ■ The correct design method for screw inserts: Important points to maximize their effectiveness *You can view detailed content of the columns through related links. For more information, please feel free to contact us.
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Free membership registrationThe screw is completed through multiple processes, including the head, the screw part, and others. This document focuses on the processing methods for the screw part, but in reality, it is necessary to select the most optimal method by considering the processing of other parts as well. Additionally, what is deemed optimal in this document is not exhaustive, as the best method may vary depending on customer requests and the prioritization of conditions. 【Contents】 ■ Processing method for the screw part - Rolling screw ■ Processing method for the screw part - Cutting screw ■ Examples of method selection *For more details, please refer to the PDF document or feel free to contact us.
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Free membership registrationIn this document, we introduce some of the relatively commonly used male thread products available in the market. We hope you find this helpful when selecting male threads. *For more details, please refer to the PDF document or feel free to contact us.*
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Free membership registration【Publication Content】 ■ Changed from progressive press processing to etching processing + single press processing, reducing initial costs to one-third ■ Added a flat pressing process to maintain quality while reducing costs ■ Suppression of distortion in t0.01 shims and reduction of initial costs *For more details, please refer to the PDF document or feel free to contact us.
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Free membership registrationUnderstand in 3 minutes! Technical materials on screws are available for download! Please feel free to download and take a look. ■ Screw Encyclopedia We have compiled products that are relatively commonly used in the market. ■ Overview of Resins Used for Plastic Screws - Overview of resin materials - Characteristics of each type - Mechanical properties by type of resin - List of physical properties of resin materials - List of chemical resistance of resins ■ Differences Between Embedded Bolts and Double-Ended Bolts We have summarized the tolerances for "length" and "thread length," which are particularly prone to causing trouble when using embedded bolts and double-ended bolts, according to the embedded bolt standard "JIS B 1173" and the fastening component tolerance standard "JIS B 1021." - Comparison table of differences between embedded bolts and double-ended bolts - Embedded bolt standard "JIS B 1173" - Tolerances for fastening components "JIS B 1021" - How much difference is there between JIS B 1173 and JIS B 1021? *For more details, please refer to the PDF document or feel free to contact us.
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Free membership registrationThe 310 Slim is an ultra-low head type screw that is ideal for space-saving measures and enhancing design aesthetics. Its thickness is only 0.5mm for M2 and just 0.9mm for M4, making it perfect as a cover screw. 【Features】 - Ultra-thin head type - Ideal for areas without clearance in machines and equipment - No protrusion of the head after installation on the product For more details, please contact us or download the catalog.
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Free membership registrationNortlock is a locking product that utilizes axial force, designed to securely and easily fasten bolts and nuts in critical areas where loosening is problematic. It ensures maximum safety during tightening and withstands loosening caused by vibrations and impacts. It allows for easy installation and removal, and the tightening force is not affected by lubricants. Regardless of whether the tightening force is high or low, it can reliably manage the tightening and axial force. It can be used under the same temperature conditions as standard bolts and nuts and is reusable. 【Features】 ○ Self-locking utilizing tension ○ Since it manages axial force rather than friction, it is resistant to loosening due to vibrations For more details, please contact us or download the catalog.
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Free membership registrationRecoil is a wire insert with tangs that can restore damaged screw threads to the same size as before at a low cost, and it can achieve a holding strength stronger than the original screw thread. 【Features】 ○ Restores damaged screw threads to a strong holding screw thread at a low cost ○ Can restore screw threads to the same size as before the damage For more details, please contact us or download the catalog.
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Free membership registrationThe Tangless Insert features a driving notch instead of the traditional tang. This driving notch is engaged by the claws of the insertion tool during insertion. Once the insertion is complete, the dedicated tool automatically rotates in reverse, allowing the claws to detach from the insert and be stored within the grooves of the dedicated tool. Compared to inserts with tangs, there is no need to deal with tang breakage or searching for broken tangs, significantly reducing work time and leading to cost savings. 【Features】 ○ Work time reduced to one-third ○ Cost reduction achieved ○ A difference in work time of 12 seconds For more details, please contact us or download the catalog.
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Free membership registrationKeyserts are a robust, one-piece solution, unlike wire inserts such as Recoil. They are used for repairing stripped threads and reinforcing female threads, similar to Recoil. The locking key of the Keysert mechanically locks the insert to prevent rotation caused by vibration or twisting. 【Features】 ○ A more durable insert system that replaces wire in thread repair. For more details, please contact us or download the catalog.
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Free membership registrationThe drill for the bottom hole comes with a tap, and the insertion tool quickly transforms into a tap handle! The breaking tool is equipped with a magnet, eliminating the hassle of searching for the tang.
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Free membership registrationTypically, in bolt fastening, it is said that "the fastening is complete when the appropriate axial force is generated in the bolt." However, how can we confirm the generation of this axial force? Of course, there are instruments available to measure axial force, but they tend to be quite expensive. Most places probably manage it using tightening torque. This led to the development of the "DTI System (Direct Tension Indicating Fastener System)," which allows the bolt itself to indicate whether axial force is generated. 【Features】 ■ No need for temporary shutdown or suspension of inspection equipment! ■ No need to even touch the bolt! ■ Safety: Reliable due to axial force management! ■ Accuracy: Allows for precise visual inspection! ■ Reliability: Display function has a durability of over 20 years! ■ Compatible sizes: M10 to 64 (from L size 30mm) ■ Operating temperature range: -20℃ to 75℃ *For more details, please download the catalog or contact us directly.
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Free membership registration"Lock Recoil" is a lock-type insert that prevents loosening of bolts caused by vibrations and temperature changes. The middle 1 to 2 turns are polygonal, and by tightening the bolt threads in this area, it exhibits a loosening prevention effect. There are standard stock items available by material, and it is also possible to manufacture materials that are not in stock. 【Features】 ■ Prevents loosening of bolts due to severe vibrations and temperature changes ■ Reduces volume and weight, enabling cost reduction ■ Excellent seismic resistance ■ Exhibits anti-retraction effect ■ Ideal for aluminum base materials *For more details, please refer to the catalog. Feel free to contact us with any inquiries.
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Free membership registrationThe "Enzart" is a highly functional insert with a self-tapping feature. Not only does it eliminate the need for a pre-tap, but it also has a self-locking function for metal materials, resins, and wood, making it resistant to loosening due to the removal and reattachment of the screw. It provides excellent wear resistance and high pull-out strength for any type of material. 【Features】 ■ Excellent workability with self-tapping function ■ No pre-tap required ■ Equipped with self-locking function for metal materials, resins, and wood ■ High pull-out strength *For more details, please refer to the catalog. Feel free to contact us with any inquiries.
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Free membership registration"Sea Horse Lock®" is a pre-coated type product with a locking agent already applied to the threaded part, allowing for immediate tightening work. It eliminates the hassle, inconsistencies, and forgetfulness of the application process, and effectively prevents loosening due to shock and vibration. The locking agents can be broadly divided into two types: "resistance" and "adhesion," with multiple varieties available for each type, allowing for selection based on application needs. 【Features】 ■ Eliminates the hassle, inconsistencies, and forgetfulness of adhesive application ■ Customizable types, application ranges, viscosities, and colors of locking agents ■ Supports prototyping, small lots, and short delivery times *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "DTI system" is a torque management system that embeds a mechanism within the bolt to detect slight elongation caused by axial force, displaying the degree of elongation (i.e., axial force) through a color change from red to black. Insufficient axial force due to improper tightening during bolt fastening operations increases the risk of breakage and other issues. By using this system, it is possible to confirm that the planned initial axial force has been achieved at all fastening points. Since the appropriate axial force varies depending on the application, it will be determined in consultation and produced to order based on the intended use. 【Features】 ■ Improves the safety of bolt fastening assemblies by accurately grasping axial force (i.e., tightening force) ■ Constant display of axial force allows for early problem detection and trouble avoidance ■ Enhances equipment operational efficiency through pinpoint maintenance *For more details, please download the PDF or feel free to contact us.
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Free membership registrationThe "Nord-Lock Washer®" is a product that physically prevents the loosening of bolt connections by utilizing "axial force" rather than friction, featuring a washer shape consisting of two pieces. It is characterized by a wedge locking mechanism, allowing anyone to safely, easily, and reliably secure bolts and nuts, particularly effective against "rotation loosening" caused by vibrations. It can also be used in conjunction with lubricants during tightening. 【Features】 ■ Loosening prevention utilizing axial force ■ Can be used with lubricants as it does not rely on friction ■ Provides loosening prevention effects safely, easily, and reliably for anyone *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "Nortlock Washer Black" is a product characterized by its wedge locking mechanism. It consists of two washers that work together. It physically prevents the loosening of bolt connections by utilizing axial force rather than friction. Anyone can safely, easily, and reliably tighten bolts and nuts, and it is particularly effective against "rotation loosening" caused by vibrations. Additionally, it can be used in conjunction with lubricants during tightening. 【Features】 ■ Loosening prevention using axial force ■ Can be used with lubricants as it does not rely on friction ■ Provides loosening prevention effects safely, easily, and reliably for anyone ■ Effectively stops bolt loosening caused by vibrations ■ The black color allows for easy identification of whether it is installed or not *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "Nord-Lock Washer® X Series" is a product that can simultaneously solve two important issues in bolt fastening: "rotation loosening due to vibration" and "non-rotation loosening due to settling or relaxation of materials such as metal." Rotation loosening is prevented by a wedge locking mechanism, while the "spring effect," a feature of the X Series, addresses non-rotation loosening. When the bolt is tightened, the washer, shaped like a disc spring, flattens and grips the joined components. 【Features】 ■ Prevents both rotation loosening and non-rotation loosening simultaneously ■ Can be used with lubricants as it does not rely on friction ■ Provides a loosening prevention effect that is safe, easy, and reliable for anyone *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Super Bolt" is a product that allows you to tighten bolts with a diameter of over 1 meter using only hand tools. Even large-diameter bolts can be securely tightened with a torque wrench. You are freed from cumbersome tools and dangerous, inefficient work, and the working time can be significantly reduced with fewer people. [Features] ■ Anyone can accurately tighten large-diameter bolts using only a torque wrench ■ Eliminates dangerous tasks often associated with large-diameter bolts ■ No worries about seizing or galling during tightening, and no need for reaction force support *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Boltight" is a tool that completes fastening by creating a pre-tightened state through controlled hydraulic tensioning of the bolt shaft, seating the nut, and then releasing the hydraulic pressure. By equalizing the compression applied to the joined components through hydraulic means, it is possible to fasten the flange joint surfaces with uniform force, preventing leaks. As a hydraulic tool using a tensioning method, the only remaining component after work is a standard nut, making it very effective for safely and reliably tightening multiple large-diameter bolts while keeping the cost of components low. 【Features】 ■ Hydraulic tensioner that allows simultaneous and uniform tightening of multiple large-diameter bolts ■ Enables fastening without leaks by applying uniform pressure to the flange surfaces simultaneously ■ Uses standard fastening components, improving repeated fastening tasks such as piping connections on a low budget ■ Compact, lightweight, highly durable, with excellent workability and safety *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"SOLVEST" is a solid lubricant with very high durability. SOLVEST reduces friction and wear, extending the lifespan of sliding components and preventing seizure in screws, allowing for stable tightening. Due to its effectiveness, it is widely used in automobiles and machinery. There are four main types: "Dry Coat," "Grease," "Paste," and "Oil." [Features] - Excellent load-bearing performance applicable over a wide range from low to high loads - Improved wear resistance and stable friction - A product lineup covering a wide temperature range from -200°C to +500°C *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Recoil(R)" is a metal wire insert that can repair stripped threads while maintaining the original thread size. By inserting it into lightweight materials such as aluminum, magnesium, and plastic, sufficient assembly strength can be ensured. The Recoil before insertion is designed to be larger than the base material's threaded hole. After being inserted while being slightly compressed, it exerts a spring action outward, preventing it from coming loose as it pushes against the base material. 【Features】 ■ Can repair stripped threads while maintaining the original thread size ■ Reinforces soft materials like aluminum, enhancing lightweight and repeatability ■ Available in a wide range of materials and sizes to accommodate special usage environments ■ Provides stronger reinforcement than the original threads *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "YFS(R) Hexagon Socket Bolt" is a product from one of the largest Taiwanese brands specializing in the manufacturing of high-strength bolts. Thanks to advanced quality control, we can guarantee a strength classification of 12.9 even for larger sizes of M22 and above. We offer a wide range of stock sizes from a minimum of M3 to a maximum of M36, allowing for the procurement of main sizes from a single company. 【Features】 ■ Price competitiveness due to one-stop production with one of the largest production volumes in the world ■ Guarantee of high strength of 12.9 even for diameters of M22 and above ■ A lineup of over 1200 sizes from M3 to M36 *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"DISGO" is a surface treatment technology for high-strength bolts that uses a paint-based process. Since it employs blast treatment instead of pickling, there is no risk of hydrogen embrittlement. It is chromium-free, containing neither hexavalent nor trivalent chromium, and complies with various environmental regulations such as RoHS. It has high corrosion resistance, demonstrating 2000 hours of rust prevention in salt spray tests (SST). [Features] - Suitable for high-strength bolts (high corrosion-resistant surface treatment that does not require baking) - Environmentally friendly, free of hexavalent and trivalent chromium - Reduces galvanic corrosion between dissimilar metals - Customization options available, including changes in film thickness, added heat resistance, and reduced friction *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "Ultra Low Head CAP" is a hex socket bolt with an even lower head than a low head bolt. It is suitable for areas where you want to minimize the protrusion of the screw head or reduce weight. Since countersinking is not required, it allows for a reduction in work processes and time. We can also accommodate various additional processing requests. 【Features】 ■ The head height is even lower compared to the low head CAP. ■ No countersinking required, minimizing head protrusion. ■ Additional processing such as various surface treatments and anti-loosening treatments is also available. *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Nonsert(R)" is a tapping screw specifically designed for thermoplastic resin that does not require a metal insert. The metal insert, which was necessary for reinforcing the internal thread, is no longer needed, reducing labor costs. It can also prevent boss breakage in the mating material. The shaft is triangular in shape and has a sharp screw thread angle of 30° (normally 60°), allowing it to be screwed into the resin material with low torque. As a result, it is less likely to impose a load on the mating resin material, making it possible to reuse it repeatedly in the same hole. 【Features】 - No metal insert required, reusable - Shape that prevents boss breakage in the base material - High pull-out strength - Specifically for thermoplastic resin - Available in stainless steel and iron (various platings) *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationThe "310 Slim" is an ultra-low head screw with a head height of 0.5mm for M2 and 1mm for M5. It achieves a flat fastening surface without any protrusion of the screw head, eliminating the need for counterbore processing. It is recommended for applications where you want to eliminate screw head protrusion or reduce weight. The incomplete thread section below the neck is designed to be small, allowing for secure fastening without the screw head floating, even in thin sheet fastening. 【Features】 ■ Ultra-low head ■ No counterbore processing required to eliminate head protrusion ■ Can be tightened with the same torque as conventional small screws ■ The recess shape and depth are designed to enable fastening similar to cross-recess screws ■ Two types of recesses are adopted for good torque transmission: "6-lobe" and "Quo" *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Kajiritool®" is a spray that allows you to remove rusted stainless steel screws simply by spraying it. By using Kajiritool, you can eliminate the labor-intensive and time-consuming tasks of cutting or extracting screws. The special ingredients in the spray penetrate the gaps of the rusted screw, providing a lubricating effect. 【Features】 ■ Just spray and turn ■ No need for cutting or extracting rusted screws ■ Large capacity of 400ml *For more details, please refer to the related links or feel free to contact us.
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Free membership registrationWe would like to introduce the "duplex stainless steel products" handled by Ikeda Metal Industry Co., Ltd. These are stainless steels (duplex alloys) composed of austenitic and ferritic phases, combining the advantages of both types of stainless steel to boast excellent corrosion resistance and approximately double the strength. By refining the metal structure, the tensile strength at room temperature is increased to about twice that of conventional materials, allowing for thinner and lighter designs. We can accommodate not only standard dimension-compliant screws but also custom-made products. 【Features】 ■ High corrosion resistance and crevice corrosion resistance in chloride environments, excellent against stress corrosion cracking ■ Approximately double the strength and yield compared to SUS304, enabling thinner and lighter designs ■ Capable of accommodating not only standard dimension-compliant screws but also custom-made products *For more details, please refer to the related links or feel free to contact us.
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Free membership registration"Disulfide molybdenum shot processing" is a surface modification technology that involves the high-speed injection and collision of disulfide molybdenum powder, a solid lubricant, onto the surface of metal components using compressed gas. Through shot processing, disulfide molybdenum is permeated into the threaded parts of various bolts and nuts to prevent seizing. Additionally, since it can form a solid lubricant layer on the very surface of the treated object without the need for any binder, it is characterized by a significant friction reduction effect. [Features] - Prevents seizing of threaded parts and wear of components - Strongly adheres without peeling, ensuring lasting effectiveness - Compatible with a variety of materials, fine and complex shapes, and small production runs *For more details, please refer to the related links or feel free to contact us.
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