







🔒 Lock it tight, last for life — the green glue pros trust!
ESKONKE Retaining Compound Green 638 is a high-strength anaerobic adhesive designed for smooth, unthreaded cylindrical metal assemblies. With a tensile strength of 3625 PSI and a full cure time of 24 hours, it prevents loosening, corrosion, and wear by filling gaps and sealing out oxygen. Suitable for metals like steel, copper, aluminum, and more, it ensures durable, precise, and reliable component locking that withstands heavy loads and harsh conditions.
















| ASIN | B09VHBQ8W3 |
| Best Sellers Rank | #815 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Retaining Compounds |
| Brand | ESKONKE |
| Color | Green |
| Date First Available | March 2, 2022 |
| Full Cure Time | 24 Hours |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Volume | 50 Milliliters |
| Item Weight | 2.4 ounces |
| Item model number | 638 |
| Manufacturer | ESKONKE |
| Material | Polyethylene glycol 200 dimethacrylate(MPL) 60~65% / Polyethylene glycol monooleate 25~30% |
| Package Information | Bottle |
| Product Dimensions | 6.2 x 2.2 x 0.6 inches |
| Special Feature | green retaining 638, loc tite green 638, retaining compound 638, sleeve lock tight 638, sleeve retainer 638 |
| Specific Uses For Product | Evenly distribute loads and stresses, Fill gaps between components, Isolate oxygen and prolong product life, Lock components to prevent loosening, Prevent component abrasion & corrosion |
| Tensile Strength | 3625 Pounds Per Square Inch |
| UPC | 736561512613 |
| Unit Count | 1.69 Fluid Ounces |
| Viscosity | 2500 Centipoise |
| Water Resistance Level | Water Resistant |
J**C
Great product and an excellent value
Great product that is indistinguishable from the brand name stuff. You get a huge quantity by comparison for a much better price. Used it for screws on red dot optic mounts and nothing has worked loose after being used in service.
N**K
Great value and works excellent
This stuff is fantastic, save your money on threadlocker and go with this brand.
G**H
Maybe not for Space-X use, but works for me fine.
I always have a bottle of 243 and 680 on hand and use them all the time on all sorts of stuff that needs attention. Yes, the bottle is supposed to be "half full" , the air space is to prevent it from hardening in the bottle. It is sold by weight, not volume and hardens in the absence of oxygen. The application nozzle is opened by pulling up on the white ring at the base, and useful for preventing accidental spills. Not much fun finding the tipped over bottle somewhere with half the liquid hardened underneath it IFYKYK.... Slightly more viscous than the name brand which I think is nice, so I get a better chance of installing the fastener in difficult locations without it dripping off. Works the same, looks the same, smells the same, and hardens the same, at a fraction of the cost.
D**K
Great alternative...
Nice alternative to Loctite 638. Grabs quick and holds - had a .007" gap and it filled it, removed wobble, and held tight. Will update later if anything changes, but I intend to use this for many non-threaded fit-ups.
D**C
Seems To Work
This thread locker seems to work, however I found it a little tricky and did not see any info on how to actually open the bottle ... first there's the main cap, ok just pop that off it is tight at first but simple enough right? well yes and no, as with most you have to pierce the nozzle to get the liquid to flow so I did that and it still was not dispensing any liquid. NOTE: Just in case others are unsure and have the same issue I did then the following info is for you. Then I noticed there's a spot that sticks out lower on the nozzle this is a secondary seal that you must pull up on to unlock it (See Pic), while this is great it would be nice if the info to open the bottle was included in the package. So unless I somehow missed it I did not see any ... Anyway with all that sorted the product works as it should and seems to hold tight and sets quickly, but because of the lack of proper instructions I am docking a star. O and yes as others have mentioned the bottle is half full. I checked the weight of the product and it is around 50g minus the weight of the bottle, so you are getting what they say your getting, its just in a large one size fits all bottle that they must use for all there products which in my opin is just ridiculous and one of the reasons for many bad reviews, they should really just use a smaller bottle for a smaller amount, but because you only use a drop or 2 at a time this amount is still quite a lot, and should still last a very long time. Yes I can recommend this product, as it does seem like a decent value, just know it will come in an oversize bottle, but they are not shorting you on the actual product.
K**H
Does what you need on smaller threads.
The first thing to understand is that this is non-permanent and designed to prevent breaking smaller threaded parts when removing without heat or impact. It can be messy if you use too much, but that’s on you! The bottle is a good design. Store it upright to prevent leaks. Shake well!
J**R
Keeps my leg adjustments tight
Great thread lock! Use it on my Prosthetic Leg after adjustments. A gotta have item!
H**.
Just saying!
Did a great job on a metal frame for a Queen size bed.... Have had it ( the frame), for a while. Not going to bad mouth any other brands. Bought this to see if it could help even with the wear and tear of the past. Had previously used a popular brand but for what ever reason it failed immediately, (in a week or so.. Had waited to give it time to set and cure) . The Eskonse thread blocker Blue 234 actually has held and I even gave it the week to cure just like the one I havd been using previously. This thread locker worked after the same curing time, on the same frame and is still working 2 weeks later.
Trustpilot
4 days ago
2 weeks ago