Is there anyone in the forum that has used any of the 600 series loctite "retaining compounds" as thread-lockers ?
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. After24 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 the # 680 has a shear strength of 4,000.00 PSI
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 greatest resistance to the nut breaking loose and/or backing off ?
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. John