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Bolt strength
I have bought some seat bolts which I thought were 8.8 grade but the tops just have 3 lines on them. Does anyone know if they are the same strength. I am thinking that this is because they are imperial
Am I correct? David |
Medium carbon steel bolts.
M & S in Newburn can supply most nuts bolts rivnuts etc and cheap for cash too. |
Quote:
David |
Think I've found the answer
Metric 8.8 is equivalent to a grade 5. Metric 10.9, 12.9, are equivalent to grade 8. |
Tensile is 90/120,000 on those three mark ones so 8.8 is the lowest used in automotive as far as I remember for general use,10 upwards for more strength and over engineered for safety.
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