Product Introduction
Hex Bolt Din 933 Cl 8.8 is a high-strength hexagonal bolt conforming to the German DIN 933 standard, with a performance class of 8.8. Made from quality alloy steel, it has high strength and good toughness, capable of withstanding heavy loads without damage. The surface is usually zinc-plated to enhance corrosion resistance and prolong service life. Its thread design is suitable for various fastening needs, ensuring strong and reliable connections.
Product Usage Notes
Selecting Appropriate Bolt Specifications and Materials
The specifications (such as diameter and length) of Hex Bolt Din 933 Cl 8.8 must precisely match the thickness, hole diameter, and force requirements of the connected parts. For instance, overly short bolts may result in incomplete thread engagement, reducing connection strength; overly long bolts may increase installation difficulty or cause interference issues. In corrosive environments (like coastal areas or chemical plants), bolts with galvanized or Dacromet surface treatments should be selected to enhance corrosion resistance.
Standardized Installation Procedures and Torque Control
Calibrated torque wrenches must be used during installation, strictly following the standard torque values. The recommended torque for Class 8.8 bolts should refer to ISO 898-1 or the manufacturer's parameter table. Insufficient torque will lead to inadequate preload and potential loosening; excessive torque can cause bolt stretching or even fracture. The threaded area should be cleaned before installation to avoid impurities affecting engagement accuracy.
Prohibition of Mixing Different Grade or Material Fasteners
Within the same connection structure, it is prohibited to mix bolts of different strength grades (such as Class 8.8 and Class 4.6) or materials. Differences in elastic moduli and thermal expansion coefficients of different materials may cause uneven stress distribution, leading to connection failure. For example, when mixing Class 8.8 bolts with low-strength bolts, the high-strength bolts may bear excessive loads, accelerating fatigue damage.
Regular Inspection in Dynamic Load Environments
In scenarios with frequent vibration or impact loads (such as heavy machinery or vehicle chassis), the preload status of bolts should be checked every 3-6 months. Use a torque wrench to remeasure torque for attenuation, and immediately retighten to the standard value if loosening is found. Bolts exposed to high temperatures for extended periods should be additionally inspected for signs of creep or strength reduction.
Avoiding Improper Reuse
Hex Bolt Din 933 Cl 8.8 is a one-time fastener. After disassembly, if thread wear, head deformation, or cracks are present, new bolts must be replaced. Reuse may lead to insufficient preload or sudden fracture risk. If bolts have undergone plastic deformation due to overload (such as obvious stretching), even if the appearance is undamaged, they should be discarded.
Product Parameters
|
Products name |
HEX BOLT DIN 933/ISO4017 CL 8.8 |
|
Standard |
DIN,ASTM/ANSI JIS EN ISO,AS,GB |
|
Grade |
Steel Grade: DIN: Gr.4.6,4.8,5.6,5.8,8.8,10.9,12.9; SAE: Gr.2,5,8; |
|
Finishing |
Zinc(Yellow,White,Blue,Black),Hop Dip Galvanized(HDG),Black Oxide, |
|
Production Process |
M2-M24:Cold Froging,M24-M100 Hot Forging, |
|
Customized Products Lead time |
30-60days, |
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High Quality
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With a commitment to strict quality control and attentive customer service, our experienced team is always ready to address your needs and guarantee complete customer satisfaction.
Quality Control
Our professional staff meticulously monitors the production process, conducts thorough product inspections, and ensures that every final product meets the required quality standards, guidelines, and specifications.
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FAQs
Q: What is the tensile strength of Hex Bolt Din 933 Cl 8.8?
A: The tensile strength of Hex Bolt Din 933 Cl 8.8 is a minimum of 800 MPa (Megapascals). This indicates the bolt's ability to withstand tensile forces without breaking.
Q: What is the yield strength of Hex Bolt Din 933 Cl 8.8?
A: The yield strength of Hex Bolt Din 933 Cl 8.8 is approximately 80% of its tensile strength, which calculates to 640 MPa. This is the point at which the bolt begins to permanently deform under stress.
Q: What materials are used to manufacture Hex Bolt Din 933 Cl 8.8?
A: Hex Bolt Din 933 Cl 8.8 is typically manufactured using low-carbon alloy steel or medium-carbon steel. These materials provide a good balance of strength and ductility.
Q: What is the maximum body length available for Hex Bolt Din 933 Cl 8.8?
A: The maximum body length for Hex Bolt Din 933 Cl 8.8 can reach up to 800mm (31.5 inches), depending on the specific manufacturer and size range.
Q: What surface treatments are commonly used for Hex Bolt Din 933 Cl 8.8 in corrosive environments?
A: In corrosive environments, Hex Bolt Din 933 Cl 8.8 is often treated with galvanizing or Dacromet to enhance its resistance to rust and corrosion.
Q: What is the recommended torque for installing Hex Bolt Din 933 Cl 8.8?
A: The recommended torque for installing Hex Bolt Din 933 Cl 8.8 should be referenced from ISO 898-1 or the manufacturer's provided torque table. It varies based on bolt size and material.
Q: Can Hex Bolt Din 933 Cl 8.8 be reused after disassembly?
A: Hex Bolt Din 933 Cl 8.8 is generally considered a one-time fastener. If the threads are worn, the head is deformed, or cracks are present after disassembly, it should be replaced with a new bolt to avoid safety risks.
Q: What is the hardness range for Hex Bolt Din 933 Cl 8.8?
A: The hardness range for Hex Bolt Din 933 Cl 8.8 can vary depending on the specific material and heat treatment process, but it is typically within a certain range as specified by the standard or manufacturer.
Q: Are there any specific inspection requirements for Hex Bolt Din 933 Cl 8.8 in dynamic load environments?
A: Yes, in environments with frequent vibration or impact loads, Hex Bolt Din 933 Cl 8.8 should be regularly inspected for preload status and torque attenuation. Any loosening should be immediately retightened to the standard value.
Q: Can Hex Bolt Din 933 Cl 8.8 be used in high-temperature environments?
A: Hex Bolt Din 933 Cl 8.8 can be used in high-temperature environments, but its performance may be affected. Therefore, it is important to select bolts specifically designed for high-temperature applications and regularly inspect them for signs of creep or strength reduction.
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