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| Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers |  | ||
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| Posted by: john2003 ® 12/08/2006, 22:28:44 Author Profile eMail author Edit |
Hi everyone, Is there anyone in the forum that has used any of the 600 series
I have tested some loctite # 262 & #2760 thead-locker on a #10-24 screw with a small pattern hex nut having a height of 7/64". I tried black oxide finished & stainless screws with stainless and brass nuts. After 24 hours, the strength was not satisfactory. Loctite said that the #2760 is some of the strongest thread-locker they make & does not need primer and even works in the presence of a small amount of oil. I did not use primer as loctite said that the primer is already in the #2760 and advised against it's use. The screws were brand new out of the box and appeared clean and dry. Someone suggested using #680 retaining compound as a threadlocker and said that it should be stronger than threadlockers. I see no reason a retaining compound would not work as a threadlocker unless the gap in the screw threads is too large for the retaining compound to dry properly. Loctite lists the # 638 retaining compound as "maximum strength" but
Loctite's technical data sheets don't list the strength of each product in the same way and it makes it very difficult to compare products. They should just list the torque necessary to break the nut loose in each case and provide data for large and small nuts. This thing never gets hot and is always used at room temperature. I just want to use a threadlocker or retaining compound to permanently lock the nut to the screw with the greatest amount of strength possible. It's no problem to wait 24 hours for the assembly to dry. Loctite only recommnended using threadlockers, but someone out in the field said they had used the 680 loc-tite as a threadlocker with success. What loc-tite product will produce the strongest bond and/or the
I am going to test some of the 680 and perhaps 638 retaining compound, I just wanted to see if anyone had any experiences they could relate to me that might help me choose the best product for the job. Perhaps a two part epoxy would be stronger, but then I have to mix it and I would rather use a single part product already mixed. Thanks for your help.
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| Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers | |||
| Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers -- john2003 | Post Reply | Top of thread | Forum |
| Posted by: john2003 ® 12/14/2006, 20:38:28 Author Profile eMail author Edit |
Hi Randy, Thanks for the tip on the JB Weld. Locite said to try their #271 threadlocker & to use primer. Thanks
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| Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers | |||
| Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers -- john2003 | Post Reply | Top of thread | Forum |
Posted by: randykimball ®  12/10/2006, 09:14:57 Author Profile eMail author Edit |
John,
'sorry for the late response. Another idea pulled from my experience. If you want a bond for the long term, but CAN be removed with effort if needed in the future. I have used JB Weld. You mix and apply thinly to the thread group that the nut will occupy when it is in final position. I have had non-failure results, so you may want to add this to your test group. As with loc-tites, your threaded components need to be clean. g'luck The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. |
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| Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers | |||
| Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers -- randykimball | Post Reply | Top of thread | Forum |
| Posted by: john2003 ® 12/22/2006, 20:11:31 Author Profile eMail author Edit |
Hi everyone, I tested some 270, 271, 262, 2760, 638, & 680 loctite as a threadlocker on some 10-24 and 10-32 screws & nuts. Whether the thread was course or fine seemed to make no significant difference as far as strength. I tested with and without primer using black oxide finished screws and zinc, brass, and stainless nuts. The stainless nuts had the weakest bonding, and the brass nuts seemed to have the strongest bonding although the zinc seemed
The best bond seemed to be the 680 using a brass nut, black oxide finished steel screw, and 7471 primer. I think it will be plenty strong for my application, but it did not destroy the threads when taking the nut off the screw, as a couple people told me it would. The 271 was also good, but I think the 680 was a little better, and it seemed to dry faster than the 271
The 2760 does not seem very strong at all on small screws. I just thought I would report my findings to you in case anyone was interested. John |
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| Re: Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers | |||
| Re: Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers -- john2003 | Post Reply | Top of thread | Forum |
| Posted by: Kelly Bramble ® administrator, administrator 12/23/2006, 08:51:42 Author Profile eMail author Edit |
Thanks john2003! |
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| Re: Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers | |||
| Re: Re: Re: Questions regarding experiences with loctite & using 680 or 638 series retaining compounds as thread-lockers -- john2003 | Post Reply | Top of thread | Forum |
| Posted by: randykimball ® 12/23/2006, 01:11:27 Author Profile eMail author Edit |
Thank you! We all gain when people take the time to control group like this and share their findings. Thank you, so much, for all the readers that will reference this post in the future. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. |
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