Need help choosing Loctite

| |I have a threaded device that I want to 'lock up' as tightly as I can |without using heat (as in brazing). | |The thread is a 3 start, square thread, (not Acme) about 3/4" dia. by about |1" long. Its kind of loose fitting, as it is intended to move back and |forth very easily. | |My questions is whether Loctite #270 (the red threadlocker) would be best, |or would it be #620 ( the green bearing retainer) or is there something else |that would be more appropriate?

Lewis My preference is Permatex, who owned Loctite until last year.

Bearing Mount (green) for relaxed fits has the highest shear strength at 4000 psi Makes slip fits up to .015 into press fits. #68040

Bearing Mount for worn parts (Silver) works up to .020, but only 3000 psi.

I bet either would work Be sure to use the surface prep activator #24163 Rex in Fort Worth

I would use the green bearing retainer grade.

Jim

================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ==================================================

...

Sounded good, so I Googled it:

"Lewis Campbell" wrote in news: snipped-for-privacy@gbronline.com:

#262 (blue) is removeable with hand tools, should you ever need it. Red is permanent strength and requires heat to remove.

Hey Lewis,

Of course, there were over 29,000 Google hits in just under 1/2 second (for "Loctite" + "Applications"), but this was simple one:

Take care.

Brian Laws>

loctite's got a great tech service team. If you e-mail me at the office with a reminder I'll give them a call Monday.

snipped-for-privacy@wolsleyinc.ca

Greetings Lewis, Several years ago I was doing a job where 17-4 PH SS steel shaft extensions were threaded into the shaft and then finish turned. The threads were 5/8-18. We did many different combinations of shafts and extensions. All were fixed in place with #609 loctite and the activator. I don't remember what number the activator was. Anyway, less than 5 minutes after an extension was threaded in the boss came out and said he gave me the wrong print and so the extension needed to be removed and replaced with the correct one. I put a pipe wrench on the extension and when it finally came out it left the threads behind. A long story that shows how good this stuff is. I should have heated the shaft to 450 degrees but I didn't think it would be that tight that fast. Cheers, eric

Thanks to all of you for your help and suggestions, I really appreciate it.

Part of my confusion in my search comes from that fact that, for instance, Loctite # 271 is described as 'Very High strength', #2760 is described as 'Exceptional Strength', whereas Permatex #68040 is described as 'shear strength 4000 psi'.

Given a figure of 4000 psi, I can tell that 3000 psi means less strength but I don't know if 'Exceptional Strength' is more, less or equal to 4000 psi.

When I look at the Loctite website, in their data sheets, I didn't see any numbers that I could relate to. They had some ISO numbers but I don't know how to compare those to psi figures.

I want my gizmo >>( I have a threaded device that I want to 'lock up' as tightly as I can without using heat (as in brazing).

Hi, Doug, thanks for your offer, I appreciate it.

However, if this is the number:- 1-800-562-8483 I can give them a call.

If you have a better suggestion, I would appreciate it.

Kind regards.