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High - Strength Bolt

Parameter Category	Description
Thread Standard	Metric (ISO): M8–M64; Imperial (ASTM): 1/2"–2"
Material & Grade	Alloy steel: Grade 8.8 / 10.9 / 12.9 ; Stainless steel alloy: Grade A4-80 / A4-100
Surface Treatment	Hot-dip galvanizing; Dacromet coating ; Phosphating + oil coating ; Black oxide coating
Mechanical Properties	Grade 10.9: Yield strength ≥900MPa, Tensile strength ≥1000MPa; Grade 12.9: Yield strength ≥1080MPa, Tensile strength ≥1200MPa; Shear strength ≥640MPa (Grade 10.9)
Size & Dimensions	Shank length: 20mm–600mm; Head type: Hex head / Hex socket head / Flange head; Thread type: Partial thread / Full thread

Overview
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Structural Features
Made of high-strength alloy steel (e.g., 40Cr, 20MnTiB) with quenching and tempering treatment (Hardness HRC 28–38). Available in hex, socket, T-head, and friction-grip types with anti-corrosion finishes. Structural bolts rely on high pre-tension to create friction grip, resisting shear forces and protecting threads.

Performance Advantages
• High Tensile Strength: Grade 10.9 ≥1000MPa, Grade 12.9 ≥1200MPa.
• Fatigue & Impact Resistance: Excellent durability for heavy-duty dynamic loads.
• Stable Clamping: Maintains consistent preload under vibration and temperature changes.
• Corrosion Protection: Features robust coatings like hot-dip galvanizing or Dacromet.
• Standard Compliance: Meets ISO 898-1 and ASTM A325 standards.

Applications
Essential for steel structures, bridges, wind turbines, heavy machinery, and aerospace ground equipment where high safety and reliability are required.