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: Allowable Stress for Bolt Specification
: Allowable Stress for Bolt Specification -- ChuckM	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 04/18/2010, 10:47:15 Author Profile eMail author Edit

Hi Chuck, Not sure I understand the question. What are you trying to do? There are only so many grades of bolts in total and there are specifications easily available for them all. Try looking at DIN specs also but they will pretty much parallel our "Grade" specs. Although I am not aware of a DIN counterpart for Grade 2. There probably is but I would use chopsticks and rubber bands before using Grade 2 anything. More information will get a more informed answer. Dave

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: : Allowable Stress for Bolt Specification
: : Allowable Stress for Bolt Specification -- Pinkerton	Post Reply	Top of thread	Engineering Forum

Posted by: ChuckM ® 04/18/2010, 11:58:43 Author Profile eMail author Edit

The AISC provides allowable Shear and Tension specification for structural bolts, which are types A307, A325, A490, etc., used in structural connection. The allowable stress is typically a percentage of the minimum yield strength. An A325 High Strength structural bolt has an allowable shear stress of 15.0 kpsi, and an allowable tension stress of 40 kpsi, per AISC. A A325 bolt has an minimum yield strength of 92 kpsi for bolts up to 1" in diameter. A Grade 8 bolts has a minimum yield strength of 130kpsi. Yet I have seen load capacity tables on the Internet for Grade 8 bolts based on very low stress limits, e.g. 6.5kpsi. What I am looking for is the equivalent governing specifications for machine applications using Grade 8 quality fasteners, similar to what the AISC manual provides for structural applications.

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: : : Allowable Stress for Bolt Specification
: : : Allowable Stress for Bolt Specification -- ChuckM	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 04/18/2010, 16:57:05 Author Profile eMail author Edit

Ah, OK, got it. Grade 8 should be in SAE J429. I don't have a copy and too old and lazy to search online. The close-to equivalent to Grade 8 in ASTM is A354. Instead of looking for tables, would it not be easier just to calculate it? A couple of short programs into Excel and you can roll your own. Fastenal have a good set of PDFs for free download covering all manner of things -- Bolt. Dave

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: : : : Allowable Stress for Bolt Specification
: : : : Allowable Stress for Bolt Specification -- Pinkerton	Post Reply	Top of thread	Engineering Forum

Posted by: ChuckM ® 04/18/2010, 19:05:30 Author Profile eMail author Edit

Your correct. I wasn't looking for tables, once you know what the allowable stress is for tension, shear, if the code assumes a friction non-bearing connection for shear, vs. a bearing connection, calcs are fairly straigh forward. In addition, you need to know what's the basis for a combined tension and shear connection. I have looked on line. SAE J429, or rather the SAE Fastener Standards Manual is not available for free. Amazon lists it New for $340, with no used listings. I'll have to see if one of the local universities have a copy in their library.

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: : : : : Allowable Stress for Bolt Specification
: : : : : Allowable Stress for Bolt Specification -- ChuckM	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 04/19/2010, 10:53:04 Author Profile eMail author Edit

Chuck, Google this... +"sae j429" +manual +free +filetype:pdf Have a read there. Dave

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