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  #1  
Old 5th February 2014, 08:07 PM
Davidbolam Davidbolam is offline
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Default 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
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Old 5th February 2014, 08:13 PM
flyerncle flyerncle is offline
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Medium carbon steel bolts.

M & S in Newburn can supply most nuts bolts rivnuts etc and cheap for cash too.
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  #3  
Old 5th February 2014, 08:57 PM
Davidbolam Davidbolam is offline
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Quote:
Originally Posted by flyerncle View Post
Medium carbon steel bolts.

M & S in Newburn can supply most nuts bolts rivnuts etc and cheap for cash too.
Are medium carbon steel not the same as 8.8

David
__________________
Click to see my build photos on Flikr

http://www.flickr.com/photos/67112582@N03/

Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.

Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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  #4  
Old 5th February 2014, 09:01 PM
Davidbolam Davidbolam is offline
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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.
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Click to see my build photos on Flikr

http://www.flickr.com/photos/67112582@N03/

Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.

Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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  #5  
Old 6th February 2014, 11:32 AM
flyerncle flyerncle is offline
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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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