理解螺栓标记和头部印记的完整指南。学习如何从螺栓头部标记识别螺栓等级、拉伸强度和材料特性。
Why Bolt Markings Matter
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Metric Bolt Grade Markings
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| Grade | Tensile Strength | Proof Stress | Yield Strength | Common Applications |
|---|---|---|---|---|
| 4.8 | 400 N/mm² | 320 N/mm² | 320 N/mm² | General applications, non-critical |
| 8.8 | 800 N/mm² | 640 N/mm² | 640 N/mm² | Construction, machinery |
| 10.9 | 1000 N/mm² | 900 N/mm² | 940 N/mm² | Heavy machinery, vehicles |
| 12.9 | 1200 N/mm² | 1080 N/mm² | 1152 N/mm² | Precision machinery, critical applications |
How to Read Bolt Markings
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Stainless Steel Bolt Markings
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Marking Recognition in African Projects
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常见问题
See frequently asked questions below.
What are Technical Guide and how are they used?
Technical Guide are essential components in construction and manufacturing. Proper selection depends on load requirements, environmental conditions, and material compatibility.
How do I choose the right fastener for my project?
Consider the material being fastened, load requirements, environmental exposure, and applicable standards. Consult with a professional if unsure about specifications.
What materials are available for these fasteners?
Common materials include carbon steel, stainless steel, alloy steel, and specialty alloys. Each offers different strength, corrosion resistance, and cost characteristics.
Do you offer custom manufacturing?
Yes, we offer custom fastener manufacturing to spec. Contact our sales team with your requirements for pricing and lead times.
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