CANCRUSHER Posted April 27, 2013 Share Posted April 27, 2013 Sorry for the dumb question but can someone tell me the difference between grades of bolts(2,5,8)? Thanks. Quote Link to comment Share on other sites More sharing options...
jchapman Posted April 27, 2013 Share Posted April 27, 2013 The short answer is that Grade 2 is the weakest, Grade 5 is much harder to bend compared to a Grade 2 of the same bolt type, and Grade 8 is even harder to bend than a Grade 5 bolt of the same type. Quote Link to comment Share on other sites More sharing options...
CANCRUSHER Posted April 27, 2013 Author Share Posted April 27, 2013 The short answer is that Grade 2 is the weakest, Grade 5 is much harder to bend compared to a Grade 2 of the same bolt type, and Grade 8 is even harder to bend than a Grade 5 bolt of the same type. So a 3/8 grade 2 is equivalent to a 5/16 grade 5? Quote Link to comment Share on other sites More sharing options...
jchapman Posted April 27, 2013 Share Posted April 27, 2013 The short answer is that Grade 2 is the weakest, Grade 5 is much harder to bend compared to a Grade 2 of the same bolt type, and Grade 8 is even harder to bend than a Grade 5 bolt of the same type. So a 3/8 grade 2 is equivalent to a 5/16 grade 5? Not necessarily. Quote Link to comment Share on other sites More sharing options...
Grip_noob Posted April 28, 2013 Share Posted April 28, 2013 If you look at the minimum requirements to the manufactoring of different grade bolts, a grade 5 is then 41% weaker than a grade 8 and a grade 2 is 61% weaker than a grade 5. Bolts vary, so they can be stronger than this, but not any weaker or the batch would be discarded. Anyway it should give you an idea about the strenght difference between the different grades of bolts. 2 Quote Link to comment Share on other sites More sharing options...
Mike Sharkey Posted April 28, 2013 Share Posted April 28, 2013 Grade 2 Bolts is kind of a catch all for a wide variety of lower quality bolts. Grade 5, Grade 8, Grade 8.8 Grade 9, etc are all manufactured with much less variation using a higher tolerance with materials for industrial performance. (i.e., manufacturers will have tolerance ranges for these bolts). Quote Link to comment Share on other sites More sharing options...
CANCRUSHER Posted April 28, 2013 Author Share Posted April 28, 2013 Thanks to all for the info. Quote Link to comment Share on other sites More sharing options...
Jedd Johnson Posted April 28, 2013 Share Posted April 28, 2013 Cancrusher, I'd also like to throw out there something in case you don't know (I can't tell from what is written already if you know this or not). You can tell these bolts apart by looking at the heads. In my experience, Grade 2's have 3 diagonal and parallel slashes on the head. Grade 5's have 3 dashes around the outside perimeter of the head and the Grade 8 has six around the outside. Hope this helps. Again, just in case you weren't aware. Jedd 2 Quote Link to comment Share on other sites More sharing options...
Geralt Posted April 29, 2013 Share Posted April 29, 2013 (edited) Now, I'm a complete noob and starter in all of this, but I found (besides Jedd's and this board's excellent links) this one site. Gives a good insight also on the gradings. http://k-tbolt.com/bolt_chart.html I take it that these are universal standards..? Edited April 29, 2013 by Geralt Quote Link to comment Share on other sites More sharing options...
Mike Sharkey Posted April 29, 2013 Share Posted April 29, 2013 (edited) Listen.... Before we get too far down this topic, let me say this. Bolts. Bend them, sure. However, they are not really the optimal pieces of steel to use to work to get better at bending. Not at all. Think of them as an assistance exercise. Their movement is weird and springy, and while you can say that makes them harder (which it does) it also makes the forces necessary to destroy them difficult to master, and, more importantly understand. Think of only learning to bench press with that bamboo bar that Westside uses with weight hanging off them. Useful, but hardly the ideal primary training tool. Progressive 0-1 Drill Rod is the ideal training stock imo. Its consistent, bends cleanly but binds up through the bend, leading to strength gains, and has a very difficult crush portion relative to the kink. Stainless steel is also great, but you can't find the gradated sized you can with 0-1. CRUSHER, I've seen you bend a Red Nail in a single IMP. The only bolt of 1/4" diameter that might be remotely challenging for you are the black grade 8's that are over 500#. Really you should be looking at Edgins, which are 5/16" Grade 5 bolts. Edited April 29, 2013 by Mike Sharkey 1 Quote Link to comment Share on other sites More sharing options...
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