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Precision Springs Product List and Ranking from 9 Manufacturers, Suppliers and Companies | IPROS GMS

Last Updated： Aggregation Period:May 20, 2026～Jun 16, 2026
This ranking is based on the number of page views on our site.

Precision Springs Manufacturer, Suppliers and Company Rankings

Last Updated： Aggregation Period:May 20, 2026～Jun 16, 2026
This ranking is based on the number of page views on our site.

  1. アキュレイト 東京カスタマーセンター Tokyo//Ferrous/Non-ferrous metals
  2. 宮下スプリング製作所 Tokyo//Manufacturing and processing contract
  3. I-TEN 精密ばね製造部・精密板金製造部 Hyogo//Machine elements and parts
  4. 4 幸手スプリング Ibaraki//Machine elements and parts
  5. 4 布施精密発條 本社工場 Osaka//Machine elements and parts
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Precision Springs Product ranking

Last Updated： Aggregation Period:May 20, 2026～Jun 16, 2026
This ranking is based on the number of page views on our site.

  1. Bane's AKIBA Showroom アキュレイト 東京カスタマーセンター
  2. A Satirical and Humorous Senryu of Prep School Students Seen Through Springs and Peening アキュレイト 東京カスタマーセンター
  3. The difference between coloring steel wire through low-temperature annealing and bluing, and their purposes. アキュレイト 東京カスタマーセンター
  4. Establishment of Standards and Changes in Steel Materials in the Spring Industry during the Showa Period アキュレイト 東京カスタマーセンター
  5. 4 Changes in the fatigue strength of springs due to dimensional effects and the influence of internal defects in the material. アキュレイト 東京カスタマーセンター

Precision Springs Product List

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Exploring the relationship between fishing and springs: Research for the school festival and the fun of the Japanese language.

Exploring the relationship between fishing and springs: Research for the school festival and the fun of the Japanese language.

[Reproduction of Private Spring Preparatory School Lecture 49] Fishing rods are similar to springs in that they utilize the elasticity of bamboo, that is, the force of rebound!

Today, let's go to the fishing club's classroom. Steel can be broken down into the blade of a tool and metal. With this method, most things can be deconstructed, and their etymology can be traced. For example, the "forge" in blacksmith comes from the "ka" and "chi" of "kaneuchi" (metal hitting). Additionally, the chisel used by blacksmiths is a "cutting metal," and the hatchet used for cutting wood combines the "na" from "Kusanagi no Tsurugi" (the sword of Kusanagi) and the "ta" from "to cut." Now, how are fishing and springs connected using this method? Look forward to the research results from the fishing club. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.

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The selection and importance of metal materials for springs learned with the arrival of spring.

The selection and importance of metal materials for springs learned with the arrival of spring.

[Reproduction of Private Spring Preparatory School Lecture 50] Studying metal materials for springs! I will explain the types of steel most commonly used for springs.

There are many materials used for springs. For example, the skis that I played with in the winter mountains until recently can be thought of as board-like springs that slide on the snow, and until not long ago, they were made from wood. However, nowadays, they are made from not only wood but also materials ranging from fiberglass to metal. Let's consider why these materials have been chosen. Since skis are also springs, they must not break or deform immediately when a person, who is the load, stands on them; otherwise, they would be unusable. In other words, we want an elasticity that is suitable for the load. *For more detailed information, please refer to the PDF. For inquiries, feel free to contact us.*

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The causes of burning defects and the impact of decarburization on the fatigue strength of spring steel.

The causes of burning defects and the impact of decarburization on the fatigue strength of spring steel.

[Reprint Private Spring Preparatory School Lecture 57] Burn marks can occur due to uneven quenching temperatures, uneven cooling, and the presence of scale!

Burning unevenly, that is, the cause of insufficient heating in localized areas, is often due to decarburization. Now, let's study decarburization, which is the main cause of this issue. Decarburization cannot be avoided when heating steel, not just spring steel, to high temperatures. The mechanical properties of steel are proportional to the carbon content, and fatigue strength is well proportional to hardness up to the level of spring hardness. Springs are generally used in a way that bending or torsional stresses are applied, and these stresses act so that the maximum stress occurs on the surface of the spring. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Effects and countermeasures of crystal grain growth, surface oxidation, and reduction of fatigue strength in spring steel due to overheating.

Effects and countermeasures of crystal grain growth, surface oxidation, and reduction of fatigue strength in spring steel due to overheating.

[Reproduction of Private Spring Preparatory School Lecture 58] As the grain size increases, the resistance to impact decreases, and the fatigue strength also diminishes!

The damage from overheating is not just limited to decarbonization. The grain size also increases, and surface oxidation leads to more severe skin roughness. When the grain size increases, the impact value, which refers to resistance to impact, decreases, and fatigue strength also declines. Speaking of the decline in fatigue strength, surface oxidation significantly affects skin roughness. Here, please take another look at the JIS standards for spring steel materials. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Method for determining the organizational changes in steel due to re-annealing and the depth of quenching.

Method for determining the organizational changes in steel due to re-annealing and the depth of quenching.

[Reproduction of Private Spring Preparatory School Lecture 59] Explanation of reversion! Also explaining martensite structure and changes in structure.

Today, let's study tempering. Steel that has been fully hardened becomes martensitic, but this is extremely hard, so it must be softened to an appropriate hardness, up to the spring hardness, through tempering. The range of tempering temperatures that can achieve spring hardness is 450 to 540 degrees, and the structure will be in a tempered troostite state. Let’s explain the changes in structure due to tempering in a bit more detail. *The detailed content of the article can be viewed in the PDF. For more information, please feel free to contact us.*

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Points to note during heat treatment and grinding of high-grade springs and causes of strain generation.

Points to note during heat treatment and grinding of high-grade springs and causes of strain generation.

Reproduction of Private Spring Preparatory School Lecture 60: Sometimes the spring surface may soften due to grinding heat, leading to breakage!

The stiffness of a spring is not strictly defined within a certain range. In some cases, it can be even harder. For types like leaf springs or disc springs, the spring stiffness can be increased to nearly 500 on the Brinell hardness scale. It is common to grind the surface of such springs after heat treatment, as using them with the heat-treated surface intact is very dangerous and not permissible. Now, even with such high-quality springs, there are unexpected cases of breakage, which are often due to mistakes during grinding. *For more detailed information, please refer to the PDF. For further inquiries, feel free to contact us.*

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The development of the spring industry in the early Taisho period and technological innovation through the introduction of testing machines.

The development of the spring industry in the early Taisho period and technological innovation through the introduction of testing machines.

[Reproduction of Private Spring Preparatory School Lecture 6] Standards and specifications for steel materials and springs have been established! The spring industry made great strides in the early Taisho period.

In the previous discussion, we talked about how the spring manufacturing industry modernized in the late Meiji period, and how other related industries made remarkable progress. Now, let's study the development process of the early Taisho period. In the late Meiji period, there were printing machine companies that were winding springs, and there is a story that when spring manufacturers went to take orders, they boasted that they could also wind springs. This was because the manufacturing of springs at that time was a closely guarded secret, and even if something was considered good, there were no methods to investigate it. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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The development of the automobile and aircraft industries during the Showa period and the role of the spring industry.

The development of the automobile and aircraft industries during the Showa period and the role of the spring industry.

[Reproduction of Private Spring Preparatory School Lecture 9] Explaining the transition of the automotive and aerospace industries! Also discusses war and the spring industry.

Last time, we got sidetracked with the discussion about the new type of Katasa testing machine, but we are finally entering the history of springs in the Showa period. Since the Showa period is quite recent, I believe many of you are already familiar with various aspects, so let's study quickly. The spring industry, having inherited the developments of the late Taisho period, continued to thrive, and undoubtedly, the contributions of automobiles and airplanes were significant, so this time we will focus our study on this topic. As mentioned before, the entry of American automobile manufacturing into Japan from the late Taisho to the early Showa period stimulated the existing three companies in Japan to start full-scale production. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Establishment of Standards and Changes in Steel Materials in the Spring Industry during the Showa Period

Establishment of Standards and Changes in Steel Materials in the Spring Industry during the Showa Period

[Reissue Private Spring Preparatory School Lecture 10] About the spring industry during the Showa period! Establishment of various standards and specifications, from JES to JIS.

Last time, we studied the automotive and aircraft industries that form the background of the spring industry during the Showa period. Continuing from that, this time we will have a lesson on the spring industry during the Showa period. One characteristic of the Showa period that must be addressed is the establishment of various standards and specifications. The establishment of such standards can be seen as evidence of the advancement of research into industrial products. For example, regarding the Japanese National Railways, specifications for carbon steel materials for vehicle springs, wire springs for cushions, and wire and plates of phosphor bronze for springs were established in 1928. In 1930, specifications for hard-drawn steel wire for springs were established, followed by specifications for leaf springs and steel wire springs in the following year. *For detailed content of the article, you can view it in the PDF. For more information, please feel free to contact us.

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The evolution of spring technology and heat treatment methods during the Showa period and their historical background.

The evolution of spring technology and heat treatment methods during the Showa period and their historical background.

[Reissue Private Spring Preparatory School Lecture 11] Explanation of single and double quenching methods! Discussion of new materials and technologies as well.

Last time, we talked about JES and JIS, but this time let's trace the technical history of the Showa era. I gave it a confusing title like "one-stage or two-stage," but in fact, since the late Taisho period, the method of hardening spring plates has been a significant issue for the National Railways, so let me introduce the background. The term "one-stage hardening," which was used at that time (the Taisho period), refers to what we now call "austenitizing hardening," while "two-stage hardening" refers to the process of hardening and tempering. In this regard, the terminology used in heat treatment was incorrect, so although I wrote "one-stage" and "two-stage" in the title for this preparatory school, I will use the correct terms: "austenitizing hardening" for the former and "hardening and tempering" for the latter. *You can view the detailed content of the article in the PDF. For more information, please feel free to contact us.

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The influence of dynamic stress and fatigue failure in automobile springs and its relationship with road conditions.

The influence of dynamic stress and fatigue failure in automobile springs and its relationship with road conditions.

[Reproduction of Private Spring Preparatory School Lecture 14] Characteristics of stress on springs! Used under significantly larger static and dynamic stresses.

In the last session, we started with a method for cutting wire by hand and studied fatigue testing methods, but we will continue with the lessons. As you know, springs are used in a very different way compared to general mechanical components. This is evident at a glance, as springs are often significantly bent or undergo intense stretching and contracting movements. The fact that springs are used in this manner means that they are subjected to much larger static and dynamic stresses compared to the design stresses of general mechanical components. *For detailed content of the article, you can view it in the PDF. Please feel free to contact us for more information.*

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Observation of fracture surfaces and understanding of the safety zone in fatigue testing of metallic materials.

Observation of fracture surfaces and understanding of the safety zone in fatigue testing of metallic materials.

[Reproduction of Private Spring Preparatory School Lecture 17] Metals also change when they are fatigued! An explanation of how the results of fatigue tests are organized and utilized in design.

The fracture surface of the fatigue test specimen, like that of an actual fatigue fracture, exhibits both smooth and rough surfaces. The difference is that, in many cases, the smooth surface does not show the shell-like patterns resembling tree rings. This is because the testing machine applies a constant repeated stress, preventing the progression of cracks from exhibiting a step-like pattern. The shell-like patterns that form on the fatigue fracture surface of automotive springs occur due to variations in the weight of the load or changes in road conditions, which cause fluctuations in the repeated stress. Additionally, there are instances where the smooth fracture surface of the test specimen appears discolored purple; this is due to temper colors resulting from frictional heat generated by the rubbing of the crack surfaces. *For more detailed information, please refer to the PDF. Feel free to contact us for further inquiries.*

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The Story of Butsushutarou and the Estimation Method of Fatigue Limits Learned from Static Strength and Its Practice

The Story of Butsushutarou and the Estimation Method of Fatigue Limits Learned from Static Strength and Its Practice

[Reproduction of Private Spring Preparatory School Lecture 18] Study of Fatigue Limit Estimation Method! Estimating fatigue limits from tensile strength and hardness test results.

Once upon a time, there was a story called "Monkusho Taro." It is said that he was so lazy that he would lie around all day and even relied on others to pick up the rice cakes he dropped. However, in the end, he achieved great success and was enshrined as a deity. Now, even if one does not achieve success or become a god, it can be tedious to go through exhausting tests that require both effort and time. Therefore, for those like Monkusho Taro, let’s study methods for estimating fatigue limits. This is based on the idea that there may be some relationship between fatigue limits and static strength, which many scholars are seeking to understand. The results indicate that there is a certain degree of correlation, but the variability is also quite large. The variability is not limited to just fatigue strength. *For more detailed information, please refer to the PDF. Feel free to contact us for more details.*

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The importance of factors affecting fatigue strength, such as notches and surface roughness, and their countermeasures.

The importance of factors affecting fatigue strength, such as notches and surface roughness, and their countermeasures.

[Reproduction of Private Spring Preparatory School Lecture 19] Notches reduce both static strength and fatigue strength! The scary part is the notches that are like bacteria, which are hard to see.

Last time, we studied that if we know the tensile strength of a material, we can estimate the approximate fatigue limit, and that this fatigue limit cannot be used as is. From this time onward, we will explain the factors that influence fatigue strength for a while. Have you encountered any mechanical parts in your daily handling that have broken due to fatigue failure, as we have studied so far? Please pay attention to where the starting point of fatigue cracks is. Usually, don't they start from places like keyways, oil holes, threads, abrupt changes in cross-section, or welds? *You can view the detailed content of the article in the PDF. For more information, please feel free to contact us.

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The importance of corrosion treatment and surface strengthening to enhance the durability of springs.

The importance of corrosion treatment and surface strengthening to enhance the durability of springs.

[Reproduction of Private Spring Preparatory School Lecture 23] Explanation of methods to prevent the decline of fatigue strength and surface treatments aimed at corrosion protection!

In recent discussions, we have explained the factors that lead to a decrease in fatigue strength. However, as the saying goes, "If you think you will lose, you will lose." Therefore, while we won't call it a surefire method, let's study ways to prevent the decline in fatigue strength. To improve fatigue strength, the first consideration is surface enhancement. As previously mentioned, this includes cleaning the surface and preventing decarburization, but there are also other effective measures such as corrosion protection and shot peening for springs. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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The effects and precautions of shot peening in improving the fatigue strength of spring materials.

The effects and precautions of shot peening in improving the fatigue strength of spring materials.

[Reproduction of Private Spring Preparatory School Lecture 24] An explanation of the miracle cure for improving fatigue resistance, shot peening, and other important considerations!

Today, let's study shot peening, a remedy for improving fatigue strength, as a way to wrap things up, along with other important points. Shot peening involves bombarding the surface of a spring with small steel balls at high speed using compressed air or centrifugal force to strengthen that surface. The effects of this strengthening can primarily be considered as follows: A. Blowing away surface scale and decarburization layers, thereby reducing a type of notch. B. Generating effective residual stress on the surface. C. Work hardening the surface. D. Creating a uniform roughness on the surface. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.

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The importance of changes in steel transformation and organizational structure, and hardness adjustment through heat treatment.

The importance of changes in steel transformation and organizational structure, and hardness adjustment through heat treatment.

[Reproduction Private Spring Preparatory School Lecture 28] We are explaining using a diagram that shows the carbon content and the proportion of organizational components in steel!

As a policy of our preparatory school, we aim to make our lectures as easy as possible while ensuring the content is rich and profound. However, for a while, I believe we will continue with some difficult explanations. Please study with the same enthusiasm as a wife reading a cookbook. Now, phase transformation occurs at temperatures above 700 degrees, but first, let's examine the structure of steel at room temperature. *For detailed content, you can view the PDF. For more information, please feel free to contact us.*

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Explanation of the temperature changes due to the steel transformation process and the influence of carbon.

Explanation of the temperature changes due to the steel transformation process and the influence of carbon.

[Reproduction of Private Spring Preparatory School Lecture 29] Pure iron at room temperature undergoes a sudden transformation into gamma iron when the temperature rises to 910 degrees!

Last time, I briefly explained "Steel H," but today I will finally get serious and talk about perversion. As we learned previously, steel is an alloy of iron and carbon, and the strength and structure of steel change depending on the carbon content. However, it also varies with temperature, and the stable state is represented by a "phase diagram." *For detailed content of the article, you can view it in the PDF. Please feel free to contact us for more information.*

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Detailed explanation of dimensional changes due to quenching and tempering, and heat treatment techniques.

Detailed explanation of dimensional changes due to quenching and tempering, and heat treatment techniques.

[Reproduction of Private Spring Preparatory School Lecture 32] Explanation of the relationship between temperature and elongation when heated slowly and cooled slowly!

I have been studying quenching and tempering lately, so please bear with me a little longer. ■ Expands to the point of rapid cooling I have lectured on the changes in structure caused by quenching and tempering, but today I would like to talk a bit about changes in dimensions. * For detailed content of the article, you can view it in the PDF. Please feel free to contact us for more information.

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Causes of defects due to heat treatment and preventive measures: countermeasures for overheating, quenching, and cracking.

Causes of defects due to heat treatment and preventive measures: countermeasures for overheating, quenching, and cracking.

[Reprint Private Spring Preparatory School Lecture 33] What you need to be careful about is overheating! An introduction to defects that are likely to occur during heat treatment.

Today, in the sense of a final review, let's study the defects that are likely to occur during heat treatment. The first thing to be cautious about is overheating. This occurs when steel is unnecessarily heated to a temperature above the specified level, which not only damages the fuel but also accelerates the wear of the furnace. Overheated materials are prone to decarburization, oxidation, and grain coarsening, leading to cracking and making the mechanical properties more brittle. In the heat treatment of springs, there is also a chance of overheating during shaping and quenching heating. How can we prevent this? *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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The relationship between the quality and surface defects of spring steel wire and its price.

The relationship between the quality and surface defects of spring steel wire and its price.

[Reproduction Private Spring Preparatory School Lecture 38] Make sure to check that there are differences in price depending on the type of line and the line diameter!

Last time, I lectured on the manufacturing process of spring steel wire. We studied how more effort is put into removing surface defects for higher quality wires. Today, I will discuss how this affects the surface defects of the wire and how it reflects on the price. First, looking at the raw material wire, the higher the carbon content, the more expensive it is. For example, if the price of high carbon steel wire type 6 is set at 100, then that of high carbon steel wire type 4 is 87. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Quality and tensile strength of spring steel wire and changes in coil diameter.

Quality and tensile strength of spring steel wire and changes in coil diameter.

[Reproduction of Private Spring Preparatory School Lecture 39] An explanation of how the tensile strength of spring steel wire significantly affects coiling!

I also assigned this as homework, but did you understand the differences in quality and performance among various types of spring steel wire? Today, let's try making springs with steel wire. Oh, excuse me, you all are better at spring manufacturing than I am. I would like to learn from you, so let's skip that. By the way, why do the springs made from spring steel wire fit precisely into certain dimensions and specific spring characteristics? *For detailed content, you can view it in the PDF. Please feel free to contact us for more information.*

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Improvement of fatigue resistance of springs by shot peening and precautions during processing.

Improvement of fatigue resistance of springs by shot peening and precautions during processing.

[Reproduction of Private Spring Preparatory School Lecture 43] Fine matte texture on airplane parts! Explanation of shot peening.

Shot peening is a processing method in which countless small steel balls are struck against the surface of springs that have completed shaping and heat treatment. As a result of this processing, the surface of the spring develops numerous indentations and becomes similar to a pearlescent pattern. The formation of these surface irregularities occurs because the steel balls collide with great force against the surface of the steel, causing that area to undergo plastic deformation. *For more detailed information, please refer to the PDF. Feel free to contact us for further inquiries.

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A comprehensive summary of the causes of wire spring damage and preventive measures.

A comprehensive summary of the causes of wire spring damage and preventive measures.

[Reproduction of Private Spring Preparatory School Lecture 45] The usable temperatures of various steel wires and JIS related to wire springs are also included in the table!

I would like to conclude the long study of spring mechanics with this session. Looking at examples of spring failures, they can be broadly categorized into breakage and deformation. Among these, the causes of breakage are mostly due to manufacturing defects and usage defects, while material defects are relatively minor. A common manufacturing defect is surface defects caused by overheating during heat treatment. In terms of usage defects, deterioration due to corrosion is likely. In the former case, shot peening is effective, while in the latter case, using stainless steel materials is effective. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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The Flower Preparatory School Festival: Lessons Hidden in the Songs Unraveled by the Folk Song Club

The Flower Preparatory School Festival: Lessons Hidden in the Songs Unraveled by the Folk Song Club

[Reproduction of Private Spring Preparatory School Lecture 46] Introducing songs about mainsprings, songs that encourage quality control, and songs related to painting and spring surfaces!

We decided to hold a school festival here to foster a connection between teachers and students. Titled, "Flower's Spring Prep School - School Festival." I wonder what kind of repertoire will emerge from the seriously diligent students. It's a mix of worry and excitement. First of all, the first classroom is very lively, so we've decided to come here today. Neither the president nor the students are studying today. Let's join together with the teachers and take a look at the results of our club activities. *For detailed information, please refer to the PDF. Feel free to contact us for more details.

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A Satirical and Humorous Senryu of Prep School Students Seen Through Springs and Peening

A Satirical and Humorous Senryu of Prep School Students Seen Through Springs and Peening

[Reprint Private Spring Preparatory School Lecture 48] Introducing a short poem consisting of three lines of 5-7-5 syllables, primarily focusing on humor and satire!

This is the third time for the Hanano Preparatory School's cultural festival. It’s both beneficial and not beneficial, which is what makes it great. If we only talk about things that are beneficial, it becomes like a wedding table speech, and it gets boring. In that regard, our school's haiku club, which I will visit today, may not have much to offer and is quite poor, but it somehow gives off an interesting vibe. *For detailed content, you can view it in the PDF. Please feel free to contact us for more information.*

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The relationship between spring stiffness and strength, an important point in design.

The relationship between spring stiffness and strength, an important point in design.

[Reproduction of Private Spring Preparatory School Lecture 52] Exploring specific examples of spring stiffness! We will also explain the limitations of using a spring scale.

In general, the hardness of a spring falls within a certain range. If it is too soft, it will deform under a small load, and if it is too hard, it will have low toughness and may break. Therefore, there arises a suitable hardness that is neither too hard nor too soft, which is referred to as "spring hardness." To impart this spring hardness to metals, methods such as cold working and quenching and tempering are used. Now, let’s explore specific examples of spring hardness. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Changes in the structure of steel due to quenching and the hardening mechanism, the influence of carbon content, and its applications.

Changes in the structure of steel due to quenching and the hardening mechanism, the influence of carbon content, and its applications.

[Reproduction of Private Spring Preparatory School Lecture 54] Changes When Hardening is Done! Explanation of Carbon Content and Hardness from Hardening.

Today, let's investigate the changes that occur when quenching. First of all, it is absolutely necessary to heat the steel to a red heat for quenching. The temperature for this is the standard quenching temperature found in the familiar JIS spring steel material table. However, this is an example for heat treatment of tensile test specimens. In reality, whether it is a leaf spring or a coil spring, there is a forming process involved, so the temperature at the end of the forming process corresponds to this temperature. Now, let's consider what significance this quenching temperature has. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.*

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Effective methods and precautions for removing quenching distortion using the press reversion method.

Effective methods and precautions for removing quenching distortion using the press reversion method.

[Reproduction of Private Spring Preparatory School Lecture 62] By using the press hardening method, it is possible to suppress the amount of distortion!

This time, let's study how to remove quenching distortion during the re-baking process. When unraveling yarn that has been knitted once and re-knitting it into something else, the yarn becomes zigzagged due to long-term setting. To remove this yarn's kink, we can use steam generated from a kettle and pass the yarn through it while pulling, which surprisingly straightens the yarn. In other words, in this case, we are straightening it by applying heat and force simultaneously. The application of this method to springs that have developed quenching distortion is known as the press re-baking method. *For more detailed information, please refer to the PDF. Feel free to contact us for more details.*

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