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  1. Lubricants Sealants Adhesives
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  5. 0.32 oz
Loctite Blue Stick Threadlocker - Medium Strength - 1/4" to 3/4" Nut/Bolt - 0.32 Oz Stick

Loctite Blue Stick Threadlocker - Medium Strength - 1/4" to 3/4" Nut/Bolt - 0.32 Oz Stick

Item # LT37643
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This general-purpose, paste-like, blue threadlocker locks and seals a variety of threaded assemblies, preventing unwanted loosening of nuts and bolts. Paste-like formula in convenient stick applicator is easy to apply and avoids mess. Fastest Shipping and Great prices for Loctite Blue Stick Threadlocker - Medium Strength - 1/4" to 3/4" Nut/Bolt - 0.32 Oz Stick. Read our customer reviews of Loctite lubricants sealants adhesives. Call 1-800-940-8924 for expert service or order your lubricants sealants adhesives part number LT37643 by Loctite online at etrailer.com.
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  • Reviews (141)
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Loctite Lubricants Sealants Adhesives - LT37643

  • Sealant
  • Nut and Bolt Sealant
  • 0.32 oz
  • Loctite

This general-purpose, paste-like, blue threadlocker locks and seals a variety of threaded assemblies, preventing unwanted loosening of nuts and bolts. Paste-like formula in convenient stick applicator is easy to apply and avoids mess.


Features:

  • General-purpose, medium-strength, waxy threadlocker keeps nuts and bolts securely tightened
  • Waxy formula avoids mess
    • Won't leak in toolboxes or pockets
    • Doesn't drip when used overhead
  • Treated threads resist corrosion
  • Assembled parts can be taken apart easily with hand tools
  • Made in the USA


Specs:

  • Application: 1/4" to 3/4" (6-mm to 20-mm) nuts and bolts
  • Quantity: 0.32-oz stick (9 g)
  • Fixture cure (time required to become tacky): 10 minutes
  • Full cure (time required to reach full set): 24 hours
  • Temperature range (endurance limits of threadlocker): -65 F to 300 F


Applications: Valve cover, water pump, oil pan and drive shaft bolts, rocker arm adjustment nuts and carburetor studs



This diagram illustrates the use of this threadlocker:


diagram of threadlocker in use

Threadlocker is applied as a paste to the threads of screws, nuts and bolts before assembly to keep them securely tightened, even when vibration occurs. Threadlocker also seals out air, water and grime to prevent rust or other corrosion from forming. Nuts and bolts that aren't corroded last longer and can be taken apart more easily. Standard hand tools can break the seal of the threadlocker, allowing you to remove treated nuts and bolts, which then can be reused.


This threadlocker is anaerobic (hardens in the absence of air) and requires contact with an active metal to cure. Active metals (those that tarnish, corrode or rust) include brass, copper, bronze, iron, soft steel and nickel. If both parts to be joined are made of inactive materials, Loctite Klean 'N Prime primer must be applied to one of the surfaces for curing to occur. Inactive materials include plated parts, stainless steel, galvanized steel, magnetite steel, pure aluminum, titanium, magnesium, gold, silver, plastic, cadmium, Iconel, zinc, natural or chemical black oxide and anodized aluminum.


Klean 'N Prime can speed the cure rate of Threadlocker Blue Stick. This is especially helpful when you are applying the adhesive to any material, active or inactive, in colder temperatures (below 70 F).



506166 Loctite Blue Threadlocker Stick - Medium Strength

Alternate part number: 37643

Installation Details LT37643 Installation instructions


California residents: click here



Customer Reviews

Loctite Blue Stick Threadlocker - Medium Strength - 1/4" to 3/4" Nut/Bolt - 0.32 Oz Stick - LT37643

Average Customer Rating:  4.8 out of 5 stars   (140 Customer Reviews)

This general-purpose, paste-like, blue threadlocker locks and seals a variety of threaded assemblies, preventing unwanted loosening of nuts and bolts. Paste-like formula in convenient stick applicator is easy to apply and avoids mess.

by:

I will never go back to liquid threadlockers. This should be the industry standard. No mess, no waste, much more control, no spilling, and countless more benefits. I use it for small screws, so it makes it much easier to apply a more reasonable amount so I don't end up stripping the torx heads when I remove them from having to put too much torque on it to remove them. My only complaint about this product is that I didn't find it sooner!

Jens R.

12/3/2020

As I said in my previous review, I use this product on small screws, so I only use a little at a time. For that reason, I dont go through it very quickly, and after a year or seems to have maintained the vast majority, if not the entirety, of its effectiveness.



by:

Excellent delivery time. Product is as described and installation was just like everyone said.



by:

Easy to use, and works perfectly for locking in threaded wheel studs.



by:

easy to use website, quick shipment. i will continue to do business with trailer.



by:

applied on well. only time will tell if it works!



by:

worked good



by:

Great product, easy to use and setup time is short.



by:

Great website, great prices, and appreciate the fast shipping. Thank you very much



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These were suggested as I was replacing my suspention system. They work well. Only thing I woould say is that they are a little longer than I think they should be. Made it hard to use my torque wrench.



by:

The instructions and accompanying videos on your site made this a DIY installation that came out perfectly.



by:

This is a really solid base plate. Installation for the Pontiac Vibe was is definitely more involved that installing the alternative (Road Master). The Road Master base plate just bolts through existing bumper holes and an engine mount. This base plate is bolted directly to the frame just behind the bumper, with four 3/8" grade 5 bolts in holes you have to drill after clamping the base plate in place. I found it easy to get the required height (3/4" below bumper) but simply using a 1x3 piece of lumber. You also have drill a 1.25"hole in the frame to gain access to the inside of the frame. Tricky part of this install is getting the nuts, which are welded to a 1" plate and a ~14" steel rods, into place to be line up with the holes. It is a little hard to see. I also recommend making sure the bolts actually thread easily on to the nuts before putting the nuts in the the frame. I had the misfortune of one of the either cross threading or jamming, and I ended up having to cut the bolt head off with a sawsall using a metal blade. The bolt had not gone very far into the nut before it jammed so I was just able to get the sawsall blade behind the head, and cut it off, holding the head with a pair of vice grips. If that hadn't worked I would have had to take the car to a shop with oxy-acetaline torch to have it cut off. I was able to fish the cut of bolt out for the frame with a bent coat hanger. The first photo is of the base plate after I cut off the bolt.
Blue Ox support was GREAT! I sent them and email explaining that I needed new nuts and bolts, and they sent the needed parts (at no charge!). I just had to put my install on hold for several days.

The second problem I had was in attaching the electrical harness recepticle to the tubes on the to bar. One of the self tapping screws twisted off as I was tighting it. I ended up cutting of 1/2" of the tubes (with the sawsall) and then tapping the tubes with 1/4x20 threads, and regaining the length cut off with the bolt. My recommendation to blue ox, is that they tap these tubes with to 1/4x20, and provide regular bolts to attach the recepticle. The second picture showes the result.

When I showed the 3rd and 4th pictures to my mechanic, he was impressed and said, "That looks really solid!" The last picture shows the front of the car after I have started to assemble it (with the styrofoam padding on the bumper, and the draw bars in place.

The solidity of the Blue Ox engineering and the FABULOUS customer support has totally turned my into a Blue Ox fan. I'm glad my RV dealer suggested that I go with Blue Ox instead of the slightly cheaper solution, that would have been much less solid.



by:

Used it for the towing equipment on our Jeep and it has done it's job by keeping all the bolts in the same position. Would highly recommend



by:

Worked as expected.



by:

Locks the threads so the screw doesn't back off. Its holding down a tongue pivot bolt and a anti-rattle bolt currently. Only time will tell if it stays put per long run. Put it was exactly as desired.



by:

I ordered multiple Roadmaster products from etrailer.com to rebuild a used Roadmaster Sterling towbar and prepare my car for its first time towing behind the motorhome. The etrailer people are great to work with, the prices are good, delivery is quick, and free shipping for all of my orders. The technical support at both etrailer and Roadmaster is the best.



by:

This stuff works! Used it to install my trailer hitch bolts.



by:

Bought this product after watching the video how to install base plates on 2014 Honda CR-V. If you read the instructions talks about checking the bolts periodically for torque, now I don't know how many people are going to spend 4 hours pulling off the front bumper to this. So for peace of mind use this product so bolts won't come loose.



by:

For the installation the instructions were good, but watching some videos made it much easier to take apart a brand new car. All went well. Installed on a 2020 Chevy Equinox 2.0



by:

I have used the LocTite products for many years. They make several grades of thread locking fluids, each appropriate for specific uses. Their products do exactly what they say they will; and will secure threaded parts from vibration or lock them together permanently. Your toughest choice will be in determining which product is most appropriate for your use. My recommendation is to start with the lowest strength and work you way up as needed. Just remember that without special tools, permanent means permanent with this product. The lower grades are very strong in preventing vibratory loosening.



by:

Locktite makes very good products, and this is another one. Used for fasteners that are already assembled/torqued and it wicks into place. E-Trailer completed the order process and delivered the product as expected, so well-done to them.



by:

Loctite 243 (blue) worked great on my Harley Road King Custom primary asse3mbly. Great service and fast shipping. Would recommend etrailer to anyone. Will buy from in the future.


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