池田金属工業 List of Products and Services

The author of this document is Shibuchō, who runs a blog called "Shibuchō Technical Research Institute," which shares information about mechanical design. He is an active engineer working for a machinery manufacturer and widely disseminates information related to manufacturing technology. His clear explanations are supported by many readers as enjoyable content, even for those who are not experts. In this document, we will introduce examples of misunderstandings that beginners in mechanical design are likely to encounter among the various measures to prevent screw loosening. Are you making the same misunderstanding? Or can you properly correct the mistakes of your subordinates?

• others

■Basics of Surface Treatment ■Differences Between Trivalent Chromate and Trivalent Unichrome 　・Trivalent Chromate and Trivalent Unichrome: Do They Look Almost the Same? 　・Characteristics of Each (Corrosion Resistance and Cost) ■Types and Features of Coating-Based Surface Treatments ■Points to Note When Applying Electroplating to Screws 　・Principle of Electroplating 　・Characteristics of Electroplating 　・Main Purposes and Types of Electroplating 　・Prohibited Actions on Screws 　・Hydrogen Embrittlement and Delayed Fracture *For details, please download the PDF or contact us directly.*

• others

The screw with anti-loosening processing, "Seahorse Lock(R)," is a pre-coated type with an anti-loosening agent applied to the screw part, allowing for tightening work to be done immediately as an adhesive-based anti-loosening product. It eliminates the hassle, inconsistency, and forgetfulness of the application process, and strongly prevents loosening due to impact and vibration. The anti-loosening agents can be broadly categorized into two types: "resistance" and "adhesion," with multiple varieties available for each type, allowing for differentiation based on application needs. This product contributes to reducing the labor involved in the application process and streamlining operations. 【Features】 ■ Eliminates the hassle, inconsistency, and forgetfulness of adhesive application work ■ Customizable types, application ranges, viscosities, and colors of anti-loosening agents ■ Supports prototyping, small lots, and short delivery times ■ Specialized engineers are available to assist with specification selection and setting various torque values using testing equipment *For more details, please download the PDF or contact us directly.

• bolt

Electroplating is a very popular surface treatment for screws. Compared to hot-dip galvanizing, electroless plating, and painting surface treatments, it is also lower in cost, and products treated in this way are available on the market. If there are no commercially available products with plating, it is possible to request treatment from a processing factory for the required quantity. However, there are precautions and prohibitions that must be observed during this process. This column explains the characteristics and principles of electroplating, as well as important considerations, providing useful information for when you request electroplating. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.*

• Technical and Reference Books

Are you troubled by rust on screws? What measures are you taking against rust? I believe many people are using surface treatment (plating) as a rust prevention method. In this column, I will explain the types and characteristics of "coating-based surface treatments" that are particularly effective for rust prevention. *You can view the detailed content of the column through the related links. For more information, please feel free to contact us.*

• Technical and Reference Books

In June 2021, the introduction and operation of HACCP became mandatory, requiring businesses handling food to implement even more meticulous measures than before. Although it is not directly related to our screw industry, we have been hearing from our customers, such as those in the food machinery and restaurant industries, particularly in central kitchen facilities, about issues like, "We are receiving feedback from users regarding the problem of screws falling out during the implementation of HACCP," and "Is it acceptable to use screws made of this material in the equipment?" Therefore, I would like to reconsider "HACCP measures that can be taken with screws and fastening components." *For detailed content of the column, please refer to the related link. For more information, feel free to contact us.*

• Technical and Reference Books

This time, we infiltrated a factory that produces small-diameter products. It is a factory that manufactures small items, precision parts, nozzles, camera components, and more. We can also produce M1.0 bolts and nuts. For more details, please refer to the related links below. 【Factory Features】 ■ Specialty sizes: Φ0.2 to Φ10 ■ Minimum diameter Φ0.2 to maximum diameter Φ16, capable of producing lengths up to 200 ■ Preferred quantities: 200 to 2,000 pieces *You can view detailed content of the blog through the related links. For more information, please feel free to contact us.

• Technical and Reference Books

The sacrificial corrosion protection effect refers to zinc sacrificing itself to rust, preventing red rust from forming on steel materials, and this is the greatest advantage of electroplated zinc. On the contrary, there are also platings where the sacrificial corrosion protection effect does not occur. Nickel plating, copper plating, and even silver plating and gold plating all have a lower ionization tendency than iron (Fe), making them noble metals, and thus do not exhibit the sacrificial corrosion protection effect. *For more details, you can view the related links on the blog. Please feel free to contact us for more information.

• Technical and Reference Books

When applying electroplating such as electric zinc plating (which of course includes chromate treatment in this case) or electric nickel plating, one must be cautious of "hydrogen embrittlement." Also referred to as hydrogen brittleness, this phenomenon occurs when steel absorbs hydrogen during the plating process, leading to the formation of internal cavities and a reduction in strength. As a result, bolts may fracture. This is known as "delayed fracture," and when it occurs, it can lead to the failure of the bolted joint, making it extremely dangerous. *For more detailed information, please refer to the related links on the blog. Feel free to contact us for further inquiries.*

• Technical and Reference Books

Understand 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 standards for embedded bolts (JIS B 1173) and the tolerances for fastening components (JIS B 1021). - Comparison table of differences between embedded bolts and double-ended bolts - Standards for embedded bolts (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 materials or feel free to contact us.

• Technical and Reference Books

【Content】 ■ Change from progressive press processing to etching processing + single press processing to reduce initial costs to one-third ■ Add a flat pressing process to press processing 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.

• others

In this document, we introduce some of the relatively commonly used male-threaded 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.

• others

The screw is completed through multiple processes, including the head, the threaded part, and others. This document focuses on the processing methods for the threaded part, but in reality, it is necessary to select the optimal method comprehensively, considering the processing of other parts as well. Additionally, what is considered optimal in this document is not exhaustive, as the best method may vary depending on customer requests and the prioritization of conditions. [Contents] ■ Processing methods for the threaded part - Rolling screws ■ Processing methods for the threaded part - Cutting screws ■ Examples of method selection *For more details, please refer to the PDF document or feel free to contact us.

• others

On this page, we upload discussions about products and construction methods centered around screw fastening technology, as well as contributions from experts. We introduce columns such as "Differences between the old and new standards of screw grades" and "The risks of foreign matter contamination in food manufacturing lines and their countermeasures." There are categories, tags, and article searches available. Please take a moment to read. 【Contents】 ■ Risks of foreign matter contamination in food manufacturing lines and their countermeasures ■ Differences between the old and new standards of screw grades in tolerance classes ■ The unstable relationship between torque and axial force that you need to know for bolt fastening ■ Correct design methods for screw inserts: Important points to maximize their effectiveness *Detailed content of the columns can be viewed through related links. For more information, please feel free to contact us.

• nut

Distinguishing 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.*

• bolt

Thin sheet components such as spacers and shims used for gap adjustments 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 more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• nut

There 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 detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• bolt

If you do not thoroughly understand who will use the drawings, for what purpose, and when, there is a possibility of overlooking mistakes or encountering issues during production. Such oversights can ultimately lead to increased costs in terms of unit price, delivery time, and labor, making it extremely important to read the drawings accurately. In this column, I will summarize the role of drawings and the key points to keep in mind when creating or viewing them. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

• nut

Recently, 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.*

• nut

When manufacturing special-shaped screw parts, how much time do you 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 in some cases 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 screw lengths when creating drawings for special-shaped screw parts. *For more detailed information about this column, please refer to the related links. Feel free to contact us for more details.

• nut

I 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? When a bolt breaks, it requires a lot of effort to address the issue, and in some cases, it can halt the machinery, resulting in loss costs. In this column, we will explain the causes of large-diameter bolt breakage and the countermeasures using a product called Superbolt. *You can view the detailed content of the column through the related links. For more information, please feel free to contact us.*

• bolt

Tapping screws can be fastened by screwing directly into a pilot hole, making them 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 with the correct steps, issues such as screw stripping, boss breakage, screw lifting, and loosening may occur. This column will focus on the types of tapping screws, tightening torque, and the selection method for pilot hole diameter. *For detailed content of the column, you can view it through the related links. Please feel free to contact us for more information.*

• nut

The embedded bolt and the double-ended bolt both lack heads and have threads cut on both ends, and they are sometimes thought to be the same product, but in fact, they are different items. 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 embedded side of the embedded bolt is slightly thicker, which caused the loosening. If such an issue is discovered after mass production, it can lead to serious problems. To prevent this, let's recognize the differences between the "embedded bolt" and the "double-ended bolt." *For more details on the column, you can view it through the related link. Please feel free to contact us for more information.*

• nut

A 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 may become difficult to insert, and in some cases, even with the wire insert in place, it could lead to damage of the internal threads. Here, we will explain the "correct design method for wire inserts." *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

• nut

Many people in the manufacturing industry that use screws are likely implementing torque management based on the torque method. 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 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 detailed content of the column, please refer to the PDF. For further inquiries, feel free to contact us.*

• nut

Screws 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, you can view it through the related links. For more information, please feel free to contact us.*

• nut

One of the problems troubling the manufacturing site is the falling off of screws used on the production line. Measures taken on-site to prevent loosening can lead to unnecessary costs, which is a significant burden. In other words, the required measures should not only prevent screws from falling off but also ensure that subsequent maintenance is easy, which is also an important factor. *For more details on the column, you can view it through the related link. Please feel free to contact us for more information.*

• Interior parts

This time, I will talk about high-frequency hardening. It is a heat treatment method where a copper wire coil, called a high-frequency coil, is wrapped around a product that you want to harden, and heat is applied by passing an electric current to harden only the surface. While one might think that general heat treatments like quenching or annealing would suffice for hardening, there are valid reasons for choosing high-frequency hardening. *For more detailed content, you can view it through the related links. Please feel free to contact us for more information.*

• Other consumables

Metal materials can change their internal or surface structure by heating, cooling, or repeating these processes, thereby altering properties such as hardness and strength without changing their shape or dimensions. However, this does not mean that there are no changes in shape or dimensions at all; during heating, deformation of the shape or expansion of volume can lead to changes in dimensions. This time, I will discuss the potential issues and countermeasures that can arise when heat treating screw components. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other consumables

Screws are classified into several strength categories based on the type of material, the presence or absence of heat treatment, and the degree of heat treatment. This is referred to as the "strength classification," which can be represented by combinations of numbers or solely by numbers, as well as by combinations of alphanumeric characters. It is not an exaggeration to say that the most important factor when using screws is the strength classification. If the appropriate strength classification is not selected based on the intended use, it could lead to screw breakage, destruction of the mating base material, and potentially serious accidents such as damage to machinery and equipment. *For more detailed information, please refer to the related links. If you have any questions, feel free to contact us.*

• Other consumables

Before explaining the strength classification of screws, it is necessary to describe mechanical properties and units (specifically, the international units abbreviated as SI units). Mechanical properties refer to the characteristics of metallic materials, specifically the strength and hardness with which these materials resist external forces applied to them. Among the strength classifications of screws, the most important are "tensile strength," "yield point," and "proof strength (or 0.2% proof strength)." *For detailed content of the blog, please refer to the related links. For more information, feel free to contact us.*

• Other consumables

Strength classifications can be represented by combinations of numbers or solely by numbers, as well as by combinations of alphanumeric characters. The most commonly encountered in fastening with screws are the strength classifications of steel bolts and screws. At first glance, the strength classification of steel screws appears to be a single number expressed up to one decimal place, but in reality, it is composed of two elements. In other words, "10.9" consists of the two elements "10" and "9." *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other consumables

The strength classification of steel external threads is based on the combination of two elements represented by numbers. Let's take "10.9" as an example to examine the meaning of each number. The first "10" indicates the tensile strength, which in this case is 1,000 MPa (megapascals) or 1,000 N/mm² (newtons per square millimeter) of tensile strength. Tensile strength, as discussed in the screw reinforcement document Vol. 44, refers to the maximum stress that a bolt or screw can withstand when a tensile load is applied along its axis until it fractures. This value is expressed by dividing the load at fracture by the cross-sectional area of the bolt. So, what does a stress of 1,000 MPa or 1,000 N/mm² mean? It means that a stress of 1,000 MPa (since 1M is one million, 1,000 MPa is one billion pascals) can be applied to an area of 1 m² without causing fracture, or that a stress of 1,000 N can be applied to an area of 1 mm² without causing fracture. *For more detailed content, please refer to the related links. Feel free to contact us for more information.*

• Other consumables

The strength classifications of stainless steel bolts and screws are represented by a combination of alphanumeric characters separated by a hyphen, such as "A2-50" or "A4-70". Let's take "A2-50" as an example to explain what each part means. First, the initial "A2" indicates the type of steel, where "A" represents austenitic stainless steel, and "2" refers to steel types such as SUS304 or SUSXM7. In the classification of steel types, besides the letter "A" for austenitic stainless steel, there are also "F" for ferritic stainless steel and "C" for martensitic stainless steel. *For more details, please refer to the related links on the blog. Feel free to contact us for further inquiries.*

• Other consumables

The strength classification of steel nuts is represented only by numbers. There are eight types: "04," "05," "5," "6," "8," "9," "10," and "12," but in everyday use, they are rarely encountered based on my experience. The likely reason is that there are few, if any, commercially available products that clearly indicate the strength classification, which results in them being seldom used in daily orders and transactions. Please understand that this is solely my personal opinion. So, how are daily orders and transactions conducted? In the case of nuts, it is mostly done by material name rather than strength classification. *For more detailed content of the blog, please refer to the related links. Feel free to contact us for more information.

• Other consumables

In the screw industry, surface treatment primarily refers to plating with chemical solutions, painting with coatings, and chemical treatment through reactions with chemical solutions. The purpose of surface treatment on screws is to change their properties or add new functions, such as hardening the surface, improving corrosion resistance, and enhancing appearance. First, let’s introduce the main methods of surface treatment applied to screws. *For more detailed content, please refer to the related links. Feel free to contact us for more information.*

• Other consumables

Rust refers to the corrosion products that occur when metals react with oxygen and moisture, leading to oxidation and corrosion. Gold (Au) and platinum (Pt) do not oxidize, meaning they do not rust, but most metals do rust in the air. There are various types of rust, primarily "red rust," "white rust," "blue rust," and "black rust." *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other consumables

The reason stainless steel is resistant to rust is that "its surface is passivated." Now, what does this passivation mean? When chromium is added to iron, it combines with oxygen, meaning it oxidizes, and a thin protective film is formed on the surface of the steel. This phenomenon is called "passivation," and adding chromium in amounts of 10.5% or more is the condition for passivation to occur. The oxidized film that results from passivation is called the "passivation film," and this film prevents the progression of rust. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other consumables

Among the austenitic stainless steels, the most representative grade is undoubtedly SUS304. This SUS304 is used in many types of products, including hex bolts, hex socket bolts, and cross-recessed screws, just for the male threads. However, not all of these are made from SUS304; depending on the type and size of the screw, modified grades of SUS304 are used. The modifications are made to improve "cold workability." *For more details, you can view the related links on the blog. Please feel free to contact us for more information.*

• Other consumables

18-chromium ferritic stainless steel has inferior corrosion resistance compared to austenitic stainless steel, but it has advantages in terms of workability during cold forming of screw components. In other words, when manufactured using molds, it places less stress on the molds and the material, making it easier to produce. Additionally, since it does not contain expensive nickel like austenitic stainless steel, the price of the material itself tends to be lower. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.

• Other consumables

13-chromium martensitic stainless steel has a lower chromium content than ferritic types, which reduces its corrosion resistance; however, one of its characteristics is that it can be hardened through quenching, or heat treatment. So, what types of screws need to be hardened when using stainless steel? A representative example is drill screws. Drill screws need to be hardened because they require a drill at the tip to create a pilot hole. *For more details, please refer to the related links. Feel free to contact us for more information.*

• Other consumables

Austenitic-ferritic stainless steel combines the characteristics of austenitic stainless steel, which excels in corrosion resistance, and ferritic stainless steel, which excels in stress corrosion cracking resistance. Austenitic stainless steel has good corrosion resistance and heat resistance, as well as high strength and toughness, but care must be taken regarding stress corrosion cracking. Now, you might wonder, "What is stress corrosion cracking?" It refers to the phenomenon where cracks form in metals when they are subjected to stress in a corrosive environment, such as exposure to seawater or chlorides, or when exposed to high temperatures during welding, leading to corrosion. Notably, this can occur even under stresses that are lower than what the metal can typically withstand. *For more details, please refer to the related links on the blog. Feel free to contact us for more information.*

• Other consumables

The phenomenon where screws expand due to the frictional heat generated when tightening or loosening them, causing the male and female threads to seize and become immovable, is called "seizing." Seizing is also referred to as "galling," and stainless steel, in particular, has a tendency to seize easily due to its inherent properties. The causes of this are attributed to its low thermal conductivity and high thermal expansion rate. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other consumables

In terms of screw fastening itself, I will provide some examples of what tends to seize easily. For instance, in the fastening of hex bolts and hex nuts, when using JIS supplementary items such as JA hex nut type 1 and high nuts with greater height, the high nuts are more prone to seizing. In the case of high nuts, the grip length of the threads between the hex bolt and hex nut becomes longer, which increases the contact area between the male and female threads, generating friction heat more quickly and at a higher level. As a result, thermal expansion occurs, leading to the threads seizing. *For more detailed content of the blog, you can view it through the related links. Please feel free to contact us for more information.

• Other consumables

Let's take a look at what types of fastenings are prone to seizing. When the pitch of the screw is small, the pitch of fine-thread screws is, of course, smaller than that of coarse-thread screws. As the pitch decreases, the friction coefficient increases, making it more susceptible to heat, which in turn makes it more likely to seize. When the tightening speed is fast, electric tools with high rotation speeds generate friction heat more easily compared to manual tools, making them more prone to seizing. *You can view the detailed content of the blog through the related links. For more information, please feel free to contact us.*

• Other consumables