pexter Posted October 1, 2004 Share Posted October 1, 2004 Check out the link to these grade F-911 bolts sick tensile strength Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 1, 2004 Share Posted October 1, 2004 With grade 5's having around 105,000 tensile strength and grade 8's having around 160,000, these should be pretty tough at 190,000. Quote Link to comment Share on other sites More sharing options...
pexter Posted October 1, 2004 Author Share Posted October 1, 2004 With grade 5's having around 105,000 tensile strength and grade 8's having around 160,000, these should be pretty tough at 190,000. I bet Quote Link to comment Share on other sites More sharing options...
ishred Posted October 1, 2004 Share Posted October 1, 2004 i'm no expert, but i don't think tensile strength has anything to do with how well it bends. The sticks that i have in school to weld with go up to 100k tensile strength and bend easily. I mean coat hanger easy. Quote Link to comment Share on other sites More sharing options...
pexter Posted October 1, 2004 Author Share Posted October 1, 2004 (edited) Just found a link were you can buy these individually.grade 9 and F911 bolts Edited October 1, 2004 by pexter Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 1, 2004 Share Posted October 1, 2004 i'm no expert, but i don't think tensile strength has anything to do with how well it bends. The sticks that i have in school to weld with go up to 100k tensile strength and bend easily. I mean coat hanger easy. How thick are these sticks? Does anyone know the correct measurement we should be using to figure out how much harder certain bolts are? I usually see tensile strength and shear strength on bolt specifications. Quote Link to comment Share on other sites More sharing options...
pexter Posted October 1, 2004 Author Share Posted October 1, 2004 (edited) i'm no expert, but i don't think tensile strength has anything to do with how well it bends. The sticks that i have in school to weld with go up to 100k tensile strength and bend easily. I mean coat hanger easy. I agree.I think tensile strength is what it takes to pull,or stretch the bolt on both ends at the same time pulling it, till it breaks. Edited October 1, 2004 by pexter Quote Link to comment Share on other sites More sharing options...
supersqueeze Posted October 1, 2004 Share Posted October 1, 2004 I think it's the "yield strength" that is the measure of the type of bending we do. Pexter is correct about tensil strength being a measure of how hard it is to pull the bolt appart from opposite ends (noone is going to do this!!). And shear strength is breaking the bolt with parallel forces directed in the opposite direction (like ripping paper). Mike M. Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 1, 2004 Share Posted October 1, 2004 Allright. Well yield strength for these is 159,000 PSI, and for an average grade 5 is 92,000 and grade 8 is 130,000. Quote Link to comment Share on other sites More sharing options...
supersqueeze Posted October 1, 2004 Share Posted October 1, 2004 (edited) Jeff - Do you know the yield strength of the 5/16" X 7" G5s that Clay has put a serious (90 deg) bend in? Mike M. Edited October 1, 2004 by supersqueeze Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 1, 2004 Share Posted October 1, 2004 No, the chart I used only has the minimum strengths for that kind of bolt. It isn't specific to thickness. Here it is for reference http://www.boltdepot.com/fastener-informat...Grade-Chart.htm Quote Link to comment Share on other sites More sharing options...
foggymountainmuscle Posted October 2, 2004 Share Posted October 2, 2004 If I'm not mistaken, these bolts have the same tensile strength, and may very well exceed, most Ivanko barbells. Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 4, 2004 Share Posted October 4, 2004 So who will be the first to bend a barbell? (braced of course) Quote Link to comment Share on other sites More sharing options...
Clay Edgin Posted October 4, 2004 Share Posted October 4, 2004 I've kinked one, but there was 350lbs on each end and I was trying to shake it at lockout. Quote Link to comment Share on other sites More sharing options...
MikeP Posted October 4, 2004 Share Posted October 4, 2004 Mike Dayton claims to have kinked a barbell, but he also claims to have bent US quarters and I find that very hard to believe. The odd part is he claims that breaking handcuffs is his most impressive feat and only mentions that he can bend quarters. I have seen people break handcuffs but we all know the urban legend quality of the quarter bender. Quote Link to comment Share on other sites More sharing options...
SqeezeMasterFlash Posted October 4, 2004 Share Posted October 4, 2004 I don't know about an Elieko bar, but I think a top long bar bender could take down a cheapo bar across the back of the neck. It'd be a pretty expensive way to train though Quote Link to comment Share on other sites More sharing options...
callmeleonard Posted October 4, 2004 Share Posted October 4, 2004 There has been some discussion here about tensile strengths and how it relates to bending. I think I can add some information that might make things a little clearer when it comes to this topic. First off, tensile strength and yield strengths are completely different. The tensile strength is indeed the theoretical strength that it would take to pull a piece of the steel apart if you pulled on it like a rope. It is not a force but is given as a pressure (psi-pounds per square inch) So, if you wanted to know the force, you would take the tensile strength (in psi) and multiply that number by the cross-sectional area. So a larger piece of metal (5/16 vs. 1/4) is harder to bend because it has a larger cross-sectional area. Its also why square stock bends easier one way than the other (diamond vs. sqaure) When you are bending, 2 things happen to the piece at the same time. The outside radius of the bend is put into tension and the inside is put into compression. So the tensile strength does have some bearing as to how difficult a piece is to bend. Yield strength is usually lower than tensile strength for the same piece of metal. It is the pressure at which a piece moves out of the plastic range and into the yield range. So when you bend, you are exceeding both the yield and tensile strength. If you can only flex the piece of metal and it springs back straight, you have not exceeded the yield strength. I hope this info helps clarify some of the numbers you see when you look at the information that pertains to a specific bolt or piece of metal. If you have any questions regarding this, let me know and I will try to clarify it even more. Have fun and keep bending leonard Quote Link to comment Share on other sites More sharing options...
supersqueeze Posted October 4, 2004 Share Posted October 4, 2004 So then, the yield strength is only the pressure needed to cause permanent deformation? So the "work" (if I remember my physics correctly) would be the integral of all the forces over the entire range of the bend and this would be the value of interest? Same with closing a gripper? Mike M. Quote Link to comment Share on other sites More sharing options...
Jedd Johnson Posted September 25, 2006 Share Posted September 25, 2006 Lots of information in this thread. Quote Link to comment Share on other sites More sharing options...
verdigriz Posted September 25, 2006 Share Posted September 25, 2006 There has been some discussion here about tensile strengths and how it relates to bending. I think I can add some information that might make things a little clearer when it comes to this topic. First off, tensile strength and yield strengths are completely different. The tensile strength is indeed the theoretical strength that it would take to pull a piece of the steel apart if you pulled on it like a rope. It is not a force but is given as a pressure (psi-pounds per square inch) So, if you wanted to know the force, you would take the tensile strength (in psi) and multiply that number by the cross-sectional area. So a larger piece of metal (5/16 vs. 1/4) is harder to bend because it has a larger cross-sectional area. Its also why square stock bends easier one way than the other (diamond vs. sqaure) When you are bending, 2 things happen to the piece at the same time. The outside radius of the bend is put into tension and the inside is put into compression. So the tensile strength does have some bearing as to how difficult a piece is to bend. Yield strength is usually lower than tensile strength for the same piece of metal. It is the pressure at which a piece moves out of the plastic range and into the yield range. So when you bend, you are exceeding both the yield and tensile strength. If you can only flex the piece of metal and it springs back straight, you have not exceeded the yield strength. I hope this info helps clarify some of the numbers you see when you look at the information that pertains to a specific bolt or piece of metal. If you have any questions regarding this, let me know and I will try to clarify it even more. Have fun and keep bending leonard NOw heres a man who we need to keep on I am having problems finding accurate info on comparing metric (4.6, 4.8) strengths/grades to US grades (2,5,8etc), can you help me out at all? Thanls in advance Quote Link to comment Share on other sites More sharing options...
Tim71 Posted September 27, 2006 Share Posted September 27, 2006 Mike Dayton has broke NIJ approved name brand handcuffs with no padding on his wrists. He's also done it using a direct pull. Most people who do that use cheaper foreign made security guard-type handcuffs and they kink the chain and pull that way. Also they use duc tape on their wrists. What I've seen Mike Dayton do is very impressive. Now as far as the barbell or the quarter, I have no Idea. I've wanted to try these F-911 bolts. They look pretty cool too. Tim Quote Link to comment Share on other sites More sharing options...
bencrush Posted September 27, 2006 Share Posted September 27, 2006 I wonder what the black bolts that Beatty sent to Eric Milfeld and Tmmicklabs and probably a few others are designated. I think they're Grade 12...but wonder if they're similar to these F-911 bolts. Anyone know? Quote Link to comment Share on other sites More sharing options...
gamidon Posted September 27, 2006 Share Posted September 27, 2006 Ben, Clay Edgin bent a F911 the 6" x 1/4" it is supposed to be about a grade9. Maybe between a grade 9 and a red. Greg Quote Link to comment Share on other sites More sharing options...
bencrush Posted September 29, 2006 Share Posted September 29, 2006 Ben,Clay Edgin bent a F911 the 6" x 1/4" it is supposed to be about a grade9. Maybe between a grade 9 and a red. Greg Thanks Greg. Quote Link to comment Share on other sites More sharing options...
gazza Posted September 30, 2006 Share Posted September 30, 2006 Ben I have bent the F911 bolts and they are definately harder than the L9 type G9 bolts like greg said inbetween a g9 and a red. Quote Link to comment Share on other sites More sharing options...
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