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| Posted by: ashish ® 04/25/2007, 19:39:58 Author Profile eMail author Edit |
I need make a 1 x 6" bolt and Nut. Threads must be wrench-fit as per the ASME B18.10. It essentially means that for first minimum two threads (and max. 4 threads) the nut will be a free-fit and after that it will be a wrench thread having a torque within a range of 10 to 110 lbs. Any suggestion how this can be achieved? |
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| Re: wrench-fit thread -- ashish | Post Reply | Top of thread | Forum |
| Posted by: Kelly Bramble ® 04/27/2007, 09:19:11 Author Profile eMail author Edit |
I have done this with a locking threaded insert and a flex-lock, plastic-lock nut. The first few threads are always cut with extra clearance as manufacturing needs to do this for the cutting tool.
Search the internet (Google, Yahoo, MSN, or ..) for "locking thread". You should find tap vendors and other information. Modified by Kelly Bramble at Fri, Apr 27, 2007, 09:20:02 |
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| Posted by: jboggs ® 04/26/2007, 12:24:22 Author Profile eMail author Edit |
Can you just modify a standard bolt or threaded rod to do what you want? I don't know what the term "wrench thread" means. Wrenches are applied to bolt heads, not threads. Are you just saying that you have to have a loose section of thread and a tight section? Your torque units must be ft-lbs or in-lbs. Which is it? Are you talking about a running torque or the final tightening torque? 10 to 110 is a pretty big range. Sorry, no help, just questions. |
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| Posted by: CCR5600Design ® 04/26/2007, 13:19:40 Author Profile eMail author Edit |
I have run into similar occurances where a nut needs to easily install on the threads of a bolt to a point where it requires a wrench to go any further. In such instances, we have utilized what is called a "patch-lock" bolt where the manufacturer of the bolt actually applies a thread locking compound on the threads at a specified distance from the end of the bolt. This allows for all fasteners on the job to be installed "finger tight" so as to locate everything properly before final tightening. The compound also locks the fasteners in place and minimizes the risk of them vibrating loose. I hope this helps. Ron "What we need are more people who specialize in the impossible." - Theodore Roethke |
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