TUV Test Report for Grade 12.9 Bolts

This page presents the full TUV certification test results for Grade 12.9 wheel bolts, including chemical composition analysis, decarburization testing, hardness, microstructure, salt spray resistance, tensile performance, and proof load tests.

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📌 Test Categories

• Chemical Composition Analysis (M14x1.5)
• Decarburization / Hardness Test – M14 × 1.25
• Decarburization / Hardness Test – M15 × 1.25
• Neutral Salt Spray Test – 192 Hours (M14x1.25)
• Neutral Salt Spray Test – 192 Hours (Extended Bolts)
• Tensile Test / Proof Load Test / Wedge Loading
• Chemical Composition Analysis (M15x1.25)
• Microstructure Analysis (M15x1.25)

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📌 1. M14x1.5 - Chemical Composition Analysis

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📌 2. Decarburization / Hardness Test – M14 × 1.25

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📌 3. Decarburization / Hardness Test – M15 × 1.25

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📌 4. Neutral Salt Spray Test – 192 Hours (M14x1.25)

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📌 5. Neutral Salt Spray Test – 192 Hours (Extended Bolts)

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📌 6. Tensile Test / Proof Load Test / Wedge Loading

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📌 7. M15x1.25 – Chemical Composition

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📌 8. M15x1.25 - Microstructure

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📌 Summary

The TUV certification confirms that Grade 12.9 wheel bolts (materials: SCM440 / equivalent) meet all mechanical and corrosion resistance requirements. Tests include:

• Chemical composition within specification
• Decarburization depth and hardness acceptable
• Salt spray resistance 192 hours passed
• Proof load and tensile strength passed
• No structural defects under wedge loading
• Microstructure conforms to Grade 12.9 standards

For more information or additional test documentation, please contact us.