{"id":835,"date":"2025-06-06T13:51:13","date_gmt":"2025-06-06T04:51:13","guid":{"rendered":"https:\/\/hem.co.jp\/global\/?page_id=835"},"modified":"2025-09-24T17:04:21","modified_gmt":"2025-09-24T08:04:21","slug":"e-special-24k","status":"publish","type":"page","link":"https:\/\/hem.co.jp\/global\/e-special-24k","title":{"rendered":"Oxygen-Free Copper (OFC) Battery Terminal (24K Gold Plated Version)"},"content":{"rendered":"\n
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Battery Terminals Preferred by Auto Electrical Repair Professionals<\/h1>\n<\/div>\n<\/div>\n\n\n\n
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Oxygen-Free Copper (OFC) Battery Terminal (24K Gold Plated Version)<\/h2>\n<\/div>\n<\/div>\n\n\n\n
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Oxygen-Free Copper (OFC) Battery Terminal (24K Gold Plated Version)
DTPL 24K SET<\/p>\n\n\n\n

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Oxygen-Free Copper (OFC) Battery Terminal (24K Gold Plated Version)
DTPS 24K SET<\/p>\n\n\n\n

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\nA supreme masterpiece made from high-conductivity oxygen-free copper (OFC), plated with 24K gold for low contact resistance and superior corrosion resistance\n<\/div>\n\n\n\n

Designed to efficiently and stably supply power from automotive batteries (lead-acid batteries) to various electrical components, this terminal is crafted from the highest quality copper with a purity of 99.96% or higher, containing minimal impurities and additives. Using oxygen-free copper (OFC), known for its excellent conductivity, as the main material, this terminal reflects over half a century of experience as a professional manufacturer of automotive repair parts. Manufactured exclusively in Japan to meet Hero Electric's stringent standards, it stands as a truly unique battery terminal.<\/p>\n\n\n\n

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The surface is finished with 24K gold plating of exceptional purity (99.9% to 100.0%), chosen not only for the material\u2019s uniquely exquisite natural luster, but also for its ability to maintain low contact resistance and exhibit extraordinary corrosion resistance with minimal degradation even under atmospheric exposure. These outstanding properties make it a preferred choice for a wide range of industrial applications where utmost reliability is essential, including precision electronic devices such as computers, semiconductor manufacturing equipment, measuring instruments, and medical components.<\/p>\n\n\n\n

Hero Electric\u2019s original Oxygen-Free Copper (OFC) battery terminal with 24K gold plating embodies our unwavering commitment to innovation\u2014responding to the evolving needs and values of consumers in a changing era. More than a functional component, it is a product designed to deliver lasting satisfaction and a deep sense of pride in ownership, as we continue to pursue the creation of truly high-value offerings.<\/p>\n<\/div>\n\n\n\n

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\"MADE IN JAPAN\" \u2013 a mark of trust and reliability<\/h3>\n\n\n\n
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By integrating the extensive knowledge and specialized expertise that Hero Electric has cultivated over more than half a century into every aspect of the design phase\u2014and manufacturing exclusively at domestic facilities under innovative technologies and a rigorous, comprehensive quality control system\u2014we achieve exceptionally high precision and reliability in the products themselves.<\/p>\n<\/div>\n\n\n\n

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To meet the supreme mission of achieving both \"quality\" and \"durability\" as professional-use products, all of our products are designed and developed entirely in-house.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Uses Oxygen-Free Copper (OFC) with impurities removed to the utmost limit<\/h3>\n\n\n\n

For the first time in Japan's automotive aftermarket industry, we adopted Oxygen-Free Copper (OFC) as the core material for our battery terminal bodies. OFC is significantly purer and more conductive than standard copper, and is widely used in electronics and high-performance cables.<\/p>\n\n\n\n

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Oxygen-Free Copper (OFC) Main Body<\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n

Images are for illustration purposes.<\/em>
Not available for sale in bare (non-plated) form.<\/p>\n\n\n\n

What is Oxygen-Free Copper (OFC) ?<\/h4>\n\n\n\n
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Oxygen-Free Copper (JIS H 3100, C1020)<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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High-purity copper with a purity of 99.96% or more<\/h5>\n\n\n\n

Oxygen-Free Copper is an exceptionally pure type of copper with minimal trace elements, impurities, and oxygen, resulting in a significantly higher purity compared to general copper.<\/p>\n\n\n\n

High Electrical Conductivity<\/h5>\n\n\n\n

Oxygen-Free Copper has excellent electrical conductivity and is widely used in electronics, wiring, and conductors. Its high conductivity allows efficient transmission of electrical signals.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\u25a0Types, Grades, and Symbols of Materials Used in Oxygen-Free Copper (OFC) Battery Terminals<\/h5>\n\n\n\n
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Name<\/th>\n\t\t\tType<\/th>\n\t\t\tGradea)<\/sup><\/th>\n\t\t\tType Symbol<\/th>\n\t\t\tKey Features and Representative Applications (Reference Only)<\/th>\n\t\t<\/tr>\n\t\t
Alloy Number<\/th>\n\t\t\tForm<\/th>\n\t\t<\/tr>\n\t\t
Oxygen-Free Copper (OFC) <\/td>\n\t\t\tC1020<\/td>\n\t\t\tStrip<\/td>\n\t\t\tStandard Grade<\/td>\n\t\t\tC1020Rb)<\/sup><\/td>\n\t\t\tIt has excellent electrical and thermal conductivity, ductility, and drawability. It also offers good weldability, corrosion resistance, and weather resistance. Even when heated to high temperatures in a reducing atmosphere, it does not risk hydrogen embrittlement.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

[Note]
b) For plates and strips used for electrical conduction, a \"C\" shall be added after the type symbols P, PS, R, or RS.<\/p>\n\n\n\n

\u25a0 Chemical Composition of Oxygen-Free Copper (Alloy Number: C1020)<\/h5>\n\n\n\n
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Alloy Number<\/th>\n\t\tChemical Composition (%)<\/th>\n\t
Cu<\/th>Pb<\/th>Fe<\/th>Sn<\/th>Zn<\/th>Al<\/th>Mn<\/th>Ni<\/th>P<\/th>Zr<\/th><\/tr>\n\t
C 1020<\/td>\"Minimum99.96%\"<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

\u25a0 Mechanical Properties of Materials Used in Oxygen-Free Copper (OFC) Battery Terminals<\/h5>\n\n\n\n
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Alloy Number<\/th>\n\t\tGrade<\/th>\n\t\tProduct Symbol<\/th>\n\t\t Tensile Test<\/th>\n\t\tBending test a)<\/sup><\/th>\n\t\tHardness test a)<\/sup>(for reference)<\/th>\n\t<\/tr>\n\t
Thickness<\/span> Rangemm<\/th>\n\t\tTensile Strengthb)<\/sup><\/span>N\/mm2<\/sup><\/th>\n\t\tElongationb)<\/sup><\/span>\uff05<\/th>\n\t\tThickness<\/span> Rangemm<\/th>\n\t\tBending Anglee)<\/sup><\/th>\n\t\tInner Radiuse)<\/sup><\/th>\n\t\tThickness<\/span> Rangemm<\/th>\n\t\tVickers Hardnessb)<\/span><\/sup>HV<\/th>\n\t<\/tr>\n\t
C1020<\/td>\n\t\t\u00bdH<\/td>\n\t\tC 1020P-\u00bdHd)<\/sup>C 1020PS-\u00bdHd)<\/sup><\/td>\n\t\t0.10~<0.15<\/td>\n\t\t235~315<\/td>\n\t\t-<\/td>\n\t\t0.10~2.0<\/td>\n\t\t180\u00b0<\/td>\n\t\t1xThickness<\/span><\/td>\n\t\t0.20~20<\/td>\n\t\t75~120e)<\/sup><\/td>\n\t<\/tr>\n\t
0.15~<0.30<\/td>\n\t\t\u226710<\/td>\n\t<\/tr>\n\t
0.30~20<\/td>\n\t\t245~315<\/td>\n\t\t\u226715<\/td>\n\t<\/tr>\n\t
C 1020R-\u00bdHd)<\/sup>C 1020RS-\u00bdHd)<\/sup><\/td>\n\t\t0.10~<0.15<\/td>\n\t\t235~315<\/td>\n\t\t-<\/td>\n\t\t\u22670.20<\/td>\n\t<\/tr>\n\t
0.15~<0.30<\/td>\n\t\t\u226710<\/td>\n\t<\/tr>\n\t
0.30~4.0<\/td>\n\t\t245~315<\/td>\n\t\t\u226715<\/td>\n\t\t\u22664.0<\/td>\n\t<\/tr>\n<\/table>\n<\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

[Notes]
a) Products that fall outside the specified thickness categories are not subject to bending or hardness tests.
b) Numerical values are rounded to the nearest whole number.
d) Also applicable to plates and strips used for electrical purposes.
e) Minimum test force is 1.961 N. <\/p>\n<\/div>\n<\/div>\n\n\n\n

[Reference] Comparative Table of Conductivity of Various Materials Commonly Used for Battery Terminals<\/h5>\n\n\n\n
Comparative Materials<\/th>\nOxygen-Free Copper (OFC)
(Material used in our products)<\/td>\n		Brass<\/td>\nZinc Alloy Die-Cast<\/td>\nLead<\/td><\/tr>\n
Material Conductivity (% IACS)<\/th>\n\t101%<\/td>\n\t28%<\/td>\n\t26%<\/td>\n\t9%<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

*1. IACS refers to the International Annealed Copper Standard, which defines 100% IACS as the conductivity of annealed standard copper.
*2. The above values are general reference values and not absolute (guaranteed) values.
(*Note) Cu-Zn alloys are referred to as brass; the academic term is \"\u9ec4\u9285\" (\u014dd\u014d).
\u3000\u3000\u3000\u3000\u3000(Reference): Osawa, Nao. \"Illustrated Introduction to the Basics and Mechanisms of Copper.\" Shuwa System, 2010, p.106.<\/p>\n\n\n\n

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[Point] Easy-to-understand conductivity explained with illustrations<\/h5>\n\n\n\n

Conductivity can be compared to \"road width,\" where smoother traffic flow represents higher efficiency.<\/p>\n\n\n\n

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Copper is a critical material for realizing a sustainable, decarbonized society through renewable energy and electric vehicles<\/h3>\n\n\n\n
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\u25a0Renewable Energy Generation
Copper plays a vital role in renewable energy systems. Solar and wind power equipment requires large amounts of copper wiring. Copper's high conductivity and durability enhance the efficiency and sustainability of renewable energy generation.<\/p>\n\n\n\n

\u25a0Electric Vehicles and Charging Infrastructure
Copper is an essential material in the production of electric vehicles. Motors, batteries, and charging infrastructure for electric vehicles require large amounts of copper. Its excellent conductivity and durability contribute to improved performance and efficiency in electric vehicles.<\/p>\n\n\n\n

\u25a0Electronic Devices
Copper is also essential in electronics manufacturing. Copper wiring is used in computers, smartphones, and TVs. Its excellent heat conduction makes it suitable for use in cooling systems. As high-performance electronics become increasingly important in a decarbonized society, copper plays a crucial role in supporting this demand.<\/p>\n\n\n

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The surface is treated with 24K gold plating, which not only preserves low contact resistance but also delivers outstanding corrosion resistance and a lustrous, refined appearance<\/h3>\n\n\n\n

For the surface treatment of oxygen-free copper (OFC), we employ 24K gold plating\u2014renowned not only for its elegant appearance, but also for its exceptionally low contact resistance, superior chemical stability, and outstanding corrosion resistance. This high-grade plating is the same type used in partial plating of specialized automotive airbag connectors, as well as in precision electronics, semiconductor manufacturing equipment, and measurement instruments.<\/p>\n\n\n\n

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Before 24K Gold Plating<\/figcaption><\/figure><\/div><\/div>\n\n\n\n
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After 24K Gold Plating<\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n

About Gold Purity<\/h4>\n\n\n\n
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Gold purity (or fineness) is a measure of the amount of gold in a product, expressed as a percentage (%) or in karats (K, kt). Pure gold is 24 karats, which means it contains 99.9% to 100.0% gold.<\/p>\n<\/div>\n<\/div>\n\n\n\n

\u25a0 Gold Purity Explained at a Glance<\/h5>\n\n\n\n
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Note: Common metals used as gold alloys include silver, copper, palladium, nickel, and zinc.<\/p>\n\n\n\n

(Reference) TANAKA Holdings Co., Ltd. \u201cInteresting Facts About Precious Metals - Is it true that the higher the gold purity, the softer it is?\u201d https:\/\/www.tanaka.co.jp\/fun_facts\/gold_purity\/. (Accessed on 2024-04-17)<\/p>\n\n\n\n

Developing products with a strong emphasis on unleashing maximum performance<\/h3>\n\n\n\n

To ensure the highest priority of achieving both reliability and robustness as battery terminals under the extremely harsh conditions of automotive engine compartments, we have established key specifications that include thickened materials and a slitless structure\u2014free from notches or cracks. From the design stage onward, our in-house product development integrates the technical expertise and know-how that Hero Electric has cultivated over the years.<\/p>\n\n\n\n

Development Concept<\/th>Background Behind the Development Concept<\/th><\/tr><\/thead>
Enhanced Durability through Thicker Base Material<\/td>
  1. Structural Reinforcement
    While copper is a relatively soft material, increasing its thickness enhances its strength, thereby improving both rigidity and durability.<\/li>\n
  2. Improved Electrical Conductivity
    While oxygen-free copper (OFC) already offers excellent electrical conductivity, increasing its volume through thicker material design further enhances the efficiency of electrical signal and power transmission.<\/li><\/ol><\/td><\/tr>
Slitless Structure<\/td>
  1. Enhanced Strength and Durability
    The absence of slits (cuts or cracks) improves the overall strength and durability of the product.<\/li>
  2. Reduced Risk of Product Damage
    The slitless structure minimizes the risk of cracks or fractures, helping to avoid issues like poor contact and voltage drops.<\/li><\/ol><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Thickness Verification of Oxygen-Free Copper (OFC) Battery Terminals<\/h4>\n\n\n\n
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    Products<\/th>\n\t\t\t\tPlate Thickness<\/th>\n\t\t\t<\/tr>\n\t\t<\/thead>\n\t\t
    Bolt-Type Model<\/td>\n\t\t\t\tDTPL Series<\/td>\n\t\t\t\t1.8 mm (0.071 in)<\/td>\n\t\t\t<\/tr>\n\t\t\t
    DTPS Series<\/td>\n\t\t\t\t1.5 mm (0.059 in)<\/td>\n\t\t\t<\/tr>\n\t\t<\/tbody>\n\t<\/table>\n<\/figure>\n\n\n\n

    (Dimensional tolerance: \u00b10.1 mm \/ \u00b10.004 in)<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

    [Reference] Validation Based on Real-World Use Cases of Slit-Type Battery Terminals<\/h5>\n\n\n\n
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    Slits (cuts or cracks) can weaken the strength of objects or structures. When external force or load is applied to the slit, that area may become a point of weakness, increasing the likelihood of cracking or breakage.<\/p>\n\n\n\n

    Furthermore, Slit-type battery terminals that develop cracks due to vibrations from automobiles may cause unexpected vehicle issues, as increased contact resistance or poor connections can lead to voltage drops.<\/p><\/p>\n<\/div>\n<\/div>\n\n\n\n

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    Verified by \"Vibration Test\" Based on JIS Standards (Test materials: DTPL and DTPS)<\/h3>\n\n\n\n

    [Overview of Vibration Testing Equipment]<\/p>\n\n\n\n

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