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#1
5th February 2014, 08:07 PM
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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
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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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#2
5th February 2014, 08:13 PM
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Medium carbon steel bolts.
M & S in Newburn can supply most nuts bolts rivnuts etc and cheap for cash too.
__________________
Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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#3
5th February 2014, 08:57 PM
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Quote:
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
5th February 2014, 09:01 PM
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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.
__________________
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
6th February 2014, 11:32 AM
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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.
__________________
Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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