High tensile strength bolt 8.8

Bolt grade 8.8 is classified within the high-strength bolt category, known for its ability to withstand significant tensile and lifting loads. Its high hardness is an advantage that endows high-strength bolts with robust resistance to severe deformation.
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    Video review

    The technical specifications of the grade 8.8 Bolt

    • Form: Hexagon, partially threaded 931, fully threaded 933
    • Diameter: M10 ~ M60 or custom machining
    • Length: Custom machining
    • Material: Carbon steel
    • Surfaced finishing: Black/Plain, Electro-White-Plated, Electro-Zinc-Plated, Hot-Dip Galvanized
    • Standards: DIN 931, DIN 933, DIN 960, DIN 961, ISO
    • Brand: KPF South Korea/ CTEG


    Bolt grade 8.8 is classified within the high-strength bolt category, known for its ability to withstand significant tensile and lifting loads. Its high hardness is an advantage that endows high-strength bolts with robust resistance to severe deformation. Due to these characteristics, they find extensive applications in mechanical industries, construction, and the energy sector. In addition to grade 8.8 high-strength bolts, there are also higher-grade bolts such as 10.9 and 12.9, offering increased load-bearing capacity and finding use in situations requiring high structural integrity.

    Characteristics of Grade 8.8 Bolts

     Grade 8.8 bolts are a type of bolt manufactured from steel with an average carbon content. The composition is carefully controlled to minimize impurities such as sulfur (S) and phosphorus (P), which can impact the quality of the finished product. 

    - For Grade 8.8 high tensile strength bolt products, the inspection stages range from data input to the process of annealing, drawing, and stamping to create the shape and size, and then passing through the heat treatment line (quenching process, tempering). These stages are strictly controlled to produce products with high uniformity in accordance with ISO 898-1 standards: tensile force (Tensile Strength), elastic strength (yield strength), reference load (proof load), hardness (hadness test), permeability, and Ensure that product coating is managed in accordance with ISO 4042/ISO 10684... And finally, the product enters the market with a reputation for high quality and dependability, as seen by the bolt strength grade 8.8's attributes of shear strength, significant lifting force, long service life, and customer warranty commitment.

    - Breaking strength and yield strength are the two parameters used to express the product's mechanical properties:

    • 800 Mpa for tensile strength

    • 640 Mpa is the minimum yield strength (Yield Strength).

    Grade 8.8 high tensile strength bolts knowledge and evaluation will help us choose the best bolt for each unique connection application.

    - Grade 8.8 high tensile strength bolts are finished with a zinc-colored, hot-dip galvanized surface that may or may not have a distinctive black layer due to the heat process.

    Refer to the ISO 898-1 bolt mechanical characteristics table for more information.

    Grade 8.8 high tensile strength bolt

    The interpretation of marking symbols on bolts.

    Ký hiệu cấp bền bulong 8.8

    Refer to the size chart for bolts according to ISO 4014/4017 standards.

    Cấu tạo bulong 8.8
    Bảng tra cấp bền bulong
    Bulong cấp bền 8.8

    >>> High tensile strength bolt

    >>> Grade 8.8 Bolts

    >>> Zinc Plated Bolts Grade 8.8

    Application of Grade 8.8 high tensile strength bolt

    – In terms of tensile strength and high lifting force, grade 8.8 bolts are commonly utilized in the assembly of workshops, steel-framed structures, mechanical construction, centrifugal concrete industries, connection of flanges, pipelines, transportation infrastructure, and drainage systems where the primary consideration is static load-bearing capacity. The selection of the finishing surface is crucial to ensure the longevity of the bolts in accordance with the project's lifespan. 

    - Indoors, bolt surfaces 8.8 black (plain/black), light oil coating, or electro-zinc plated surfaces are commonly used. Dacromet plating with a hot dip galvanized surface is utilized outside the house in corrosive environments.

    Refer to the table below for coating life thickness based on environment.

    Mô tả độ dày lớp mạ trên bulong 8.8

    Why should you choose Cuong Thinh for Grade 8.8 high tensile strength bolt?

    - CTEG is committed to meeting 100% of the quality standards set: clarifying the materials used to create products for customers, providing the proper materials as promised, in line with the technical drawings and the required work.

    – Quick product return

    – On-time delivery

    - CTEG's products and services are aimed at providing the highest quality to customers, with product quality serving as the basic foundation for businesses and constantly innovating to provide the best value

    - CTEG consistently comes up with ways to import directly produced goods at the best possible prices without having to cross another bridge. helping to keep the domestic market stable. Bring manufactured goods to the world market gradually. Effectively support the growth of the nation and the industry.

    >>>More Cuong Thinh bolt products can be found HERE

    Ký hiệu cấp bền bulong 8.8

    The most important CTEG evaluation criteria:

    – Product quality: High-quality products that have been tested to meet standards before being released to the market. 

    - Warranty policy: CTEG's products are committed to providing the best after-sales service possible, including a lifetime warranty policy.

    – Delivery policy: CTEG pledges to deliver goods on time, quickly, and efficiently in order to serve you.

    – Return Policy: All defective products, even if they are in stock, will be returned. 

    Cuong Thinh Industry and Trade Joint Stock Company is delighted to be a partner and is always proud to be an importer, manufacturer, and supplier of wholesale materials for businesses, factories... in many fields, from mechanical engineering to traffic construction, industry, solar energy, shipbuilding industry... with typical products: bolts, anchor bolts, link bolts, cables, risers, screws.

    CTEG has over ten years of experience and consistently meets the needs of every client.

    Please contact CTEG as soon as possible for a consultation and quote.

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