Fastener identification thread

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  #1  
Old 10-31-13, 12:55 PM
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Fastener identification thread

Hi, I was wondering if any of you could tell me what this kind of fastener head is called and what it's used for
 
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Old 10-31-13, 01:08 PM
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It just a grade 8 bolt.
bolt grades identification - Bing Images
 
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Old 10-31-13, 01:15 PM
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yes, I do believe it has similar strenght to the grade 8, however the lines in those are just etched over the head and these lines are indented into the head, so much the you could get a grip and turn the screw with them, I distribute fasteners and have never seen this one before
 
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