Products Description
High Strength Grade 8.8, 10.9, 12.9 Hex Flange Head Bolts are premium fasteners engineered for applications requiring exceptional tensile strength and reliability. These bolts feature a flanged hex head design, combining the benefits of a hex head for easy wrenching with a flange that provides a larger bearing surface and distributes load more evenly. Available in various grades, these bolts are suitable for critical fastening in automotive, construction, and industrial settings.
Key Specifications:
Material: High-strength alloy steel (Grade 8.8, 10.9, 12.9).
Head Type: Hex flange head for easy wrenching and increased bearing surface.
Thread Type: Full thread or partial thread options available.
Finish: Zinc plated, hot-dip galvanized, or plain finish for corrosion resistance.
Sizes: Available in various diameters (M6 to M36) and lengths to accommodate different application requirements.
Products Process
Material Selection: Bolts are manufactured from high-strength alloy steel, such as Grade 8.8, 10.9, or 12.9, chosen for its specific mechanical properties and hardness.
Cold Heading: Steel rods are cold forged into the desired bolt shape, ensuring consistent dimensions and strength.
Thread Rolling: Threads are precision-rolled onto the shaft of the bolts to improve thread strength and ensure smooth assembly.
Heat Treatment: Bolts undergo heat treatment processes such as quenching and tempering to achieve the required hardness and mechanical properties for each grade.
Surface Coating: Bolts may be coated with zinc plating, hot-dip galvanizing, or other treatments to enhance corrosion resistance and prolong service life.
Quality Control: Each batch of bolts undergoes rigorous testing to ensure they meet international standards for strength, dimensions, and performance.
Products Application
High Strength Grade 8.8, 10.9, 12.9 Hex Flange Head Bolts are used in:
Automotive: Engine assemblies, chassis components, and structural applications.
Construction: Steel structures, bridges, and heavy machinery.
Industrial: Mining equipment, manufacturing machinery, and industrial plant installations where high strength and reliability are critical.
FAQ
Q: What do the grade numbers (8.8, 10.9, 12.9) mean?
A: These numbers denote the bolt's minimum tensile strength in megapascals (MPa). For example, Grade 8.8 bolts have a minimum tensile strength of 800 MPa, Grade 10.9 bolts have 1000 MPa, and Grade 12.9 bolts have 1200 MPa.
Q: What are the advantages of hex flange head bolts?
A: Hex flange head bolts provide a larger bearing surface, reducing the risk of surface damage and ensuring even distribution of clamping force.
Q: Are these bolts suitable for outdoor applications?
A: Yes, bolts with zinc plating or hot-dip galvanizing offer excellent corrosion resistance, making them ideal for outdoor and industrial environments.
Q: Can these bolts be used in high-temperature environments?
A: Grade 10.9 and 12.9 bolts can withstand higher temperatures due to their higher strength and heat treatment, but application specifics should be verified based on intended use.
Q: How should I tighten hex flange head bolts?
A: Use a torque wrench to tighten hex flange head bolts to the specified torque values to ensure proper clamping force and prevent over-tightening.
High Strength Grade 8.8, 10.9, 12.9 Hex Flange Head Bolts are designed to meet the demands of heavy-duty applications where reliability, strength, and corrosion resistance are essential. Their robust construction and precise manufacturing ensure they perform reliably under high-stress conditions.
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