Hex Bolt 12.9 Size M24 Full Thread with Class 10 Hex Nut

Specification Details: DIN 933 Hexagon Head Screw Grade 12.9 (Full Thread) with DIN 934 Hex Nut Class 12 (Size M24-3.0)

1. Thread Specification

• Diameter: M24 (Nominal diameter 24 mm)
  
• Pitch: 3.0 mm (Metric Coarse Thread)
  
• Thread Direction: Right-Hand Thread

2. Dimension SpecificationReference: DIN 933 for the screw and DIN 934 for the nut

• Type: Hexagon Head Full Thread
  
• Head Height (k): 15 mm
  
• Nut Height (m): 19 mm
  
• Wrench Size / Across Flats (s): 36 mm (The same wrench size is used for both the bolt head and the nut)

3. Mechanical & Material SpecificationReference: ISO 898-1 and ISO 898-2

• Screw Property Class: Grade 12.9. Manufactured from high-grade alloy steel, quenched and tempered to achieve maximum hardness.
  
• Minimum Tensile Strength: 1,200 N/mm² (MPa)
  
• Minimum Yield Strength: 1,080 N/mm² (MPa)
  
• Nut Property Class: Class 12 (Caution: A Class 12 nut must be used to match the 12.9 grade screw. Using a Class 10 nut is strictly prohibited as the internal threads will strip before reaching maximum load capacity).
  
• Surface Finish: Black Oxide Finish with a light rust-preventive oil coating. (Note: Electroplating/zinc plating is highly discouraged for Grade 12.9 without proper hydrogen embrittlement relief baking, as it can cause sudden brittle failure).

4. Suitable Applications

• Critical High-Stress Joints: Areas with limited space requiring massive clamping force where increasing the fastener size or quantity is not feasible.
  
• Heavy Machinery & High-Pressure Presses: Hydraulic cylinder tie rods, large metal-cutting machines, and components subjected to severe shock loads.
  
• Die & Mold Industry: Large metal stamping or injection molds enduring continuous high pressure and extreme vibration.
  
• Mining Equipment & Crane Structures: Pivot points, sling anchorages, or structural connections on machinery frequently subjected to overloading.