52 Ford
Stainless
- Joined
- May 20, 2021
Once I torque to failure, how much should I back off for my actual torque value?
HA! I see what ya did there.
Very funny, Strostovsky
Sent using Morse code on - .- .--. .- - .- .-.. -.-
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Once I torque to failure, how much should I back off for my actual torque value?
All good points but it makes the most sense for these sorts of projects to design it to use the reasonably priced, reasonably strong bolts I can get from Fastenal (I get a good discount since the business I work for buys a $20k in bolts per year).
I think I'll look into the standards they comply with to get the ideal tensile strength, and do some testing and/or calculations to determine what gets to that.
Honestly half the stuff I make could be held together with a threaded potato, but hey, I'm learneding.
About 10 years ago my dad got into a discussion with a guy who turned out to be a representative for a large fastener distributor (not sure which one - one of the BIG names, though). They did a lot of quality checks on bolts.No, absolutely not. Buy by going with a reputable manufacturer, DO NOT trust the retailer to maintain quality control. Period. They have every motivation to Sorce from low price vendors, while claiming some QC standard, a manufacturer has their name on the box and reputation on the line.
P. S., the fact you are seeing “mis-shapened” fasteners with some regularity is proof you are getting junk.
yes, it will snap. m6/10.9 torque is 13.2-16.5 nm (vdi 2230-2003). this is based on 90% ys. so 14.9 (lightly lubed)/0.9 = 16.5. uts/ys is 1000/940 mpa, corresponding to 17.5 nm. even starting with the dry value it should snap.
Notice
This website or its third-party tools process personal data (e.g. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. To learn more, please refer to the cookie policy. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise.