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Lower bolt for rear coil over

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  • Lower bolt for rear coil over

    What would be a recommended bolt for a rear coil over? The internet searches turn up recommendations that are based on anecdotal evidence or just blind faith. Some say grade 10.9, some say 12.9. Some say 12.9 is "too brittle" and more likely to shear. Others say 12.9 has the greater tensile strength and that's all that matters. I've been using a 10.9 bolt.

  • #2
    All the suspension bolts on my Touring Car were 12.9 hardness, which is what I have been replacing them with when I service and also duplicated on my club race car when I converted to Gruppe A suspension.

    As always with any information shared on an internet forum,,,YMMV...
    jimmy p.
    87 E30 M3 Prodrive British Touring Car
    88 E30 M3 Zinnoberot - Street
    88 E30 M3 Lachsilber - Race (#98 SCCA SPU)
    92 E30 M Technic Cabrio - S14 POWERED!
    98 318Ti M44, Base - Morea Green
    04 Ford F350 - V10


    • #3
      Thanks for the info!