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Old 02-02-2004, 02:45 PM   #1
BlackEclipse
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Bolt Hardness & Strength Guide

Metric bolt hardness/strength is not measured in grades. They are measured in classes. The classes are usually stamped on the head. See the following chart:

Code:
Inch  Marks   Material      Tensil Strength  Yield Strength  
Grade on Head               N/mm2    psi     N/mm2    psi  
----- ------- ------------- ------ --------- ------ -------
2     none    Steel         510    74,000    393    57,000  
5     3       Steel         827    120,000   634    92,000  
8     6       Alloy Steel   1030   150,000   896    130,000  
SHCS  none    Alloy Steel   1240   180,000   965    140,000  
18-8  none    302 Stainless 690    100,000   448    65,000  
316   none    316 Stainless 690    100,000   448    65,000  
   
  
Metric Marks   Material       Tensile Strength  Yield Strength
Class  on Head                N/mm2    psi      N/mm2    psi
------ ------- -------------- ------ ---------- ------ -------
8.8    8.8     Steel          800    116,000    640    93,000  
10.9   10.9    Steel          1040   151,000    940    136,000  
12.9   12.9    Alloy Steel    1220   177,000    1100   160,000  
A2-70  A2-70   302 Stainless  700    102,000    450    65,000  
A4-80  A4-80   316 Stainless  800    116,000    600    87,000
If you ever have the need to cut a bolt that is Class 10.9 then do not use a regular metal cutting blade in a saber saw. You need to use a diamond-embedded Dremel cutting disc.

Ace Hardware seems to be the only place around town that sells the Class 10.9 bolts which are more appropriate for use in the "home-made" camber kit.
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Last edited by BlackEclipse; 03-22-2008 at 08:55 PM.
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