--- product_id: 149710836 title: "LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906)" brand: "loctite" price: "VT962" currency: VUV in_stock: false reviews_count: 5 url: https://www.desertcart.vu/products/149710836-loctite-243-threadlocker-for-automotive-medium-strength-oil-tolerant-high store_origin: VU region: Vanuatu --- # High-temp tolerance up to ~360°C Medium-strength bond for 6-20mm fasteners Oil-tolerant, works on oily surfaces LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) **Brand:** loctite **Price:** VT962 **Availability:** ❌ Out of Stock ## Summary > 🔩 Lock it tight, service it easy — the pro’s choice for unstoppable fasteners! ## Quick Answers - **What is this?** LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) by loctite - **How much does it cost?** VT962 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/149710836-loctite-243-threadlocker-for-automotive-medium-strength-oil-tolerant-high) ## Best For - loctite enthusiasts ## Why This Product - Trusted loctite brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Medium-Strength, Removable:** Locks fasteners firmly yet allows disassembly with standard hand tools—perfect for maintenance and servicing. - • **Versatile Application Range:** Ideal for bolts and nuts from 1/4" to 3/4" (6mm to 20mm) across engine parts, brakes, alternators, and more. - • **Surface-Insensitive Adhesion:** Bonds securely on all metals including stainless steel, aluminum, and plated surfaces—even with minor oil contamination. - • **Rapid Curing, Long-Lasting Hold:** Sets in just 10 minutes and fully cures within 24 hours to prevent loosening from shock and vibration. - • **Trusted by Pros, Specified by OEMs:** Engineered and lab-tested for professional automotive use, ensuring race-grade reliability. ## Overview LOCTITE 243 is a medium-strength, blue threadlocker designed for automotive and general-purpose use. It offers superior adhesion on all metals, including oily and passive surfaces, withstanding temperatures up to 360°C. Trusted by OEMs and race teams alike, it cures quickly and allows easy disassembly with hand tools, making it ideal for maintenance on fasteners sized 6mm to 20mm. ## Description LOCTITE 243 is a general purpose, medium strength, primerless, blue threadlocker with improved oil tolerance. For fasteners between 1/4" to 3/4" (6mm to 20mm). Parts can be separated using hand tools.LOCTITE 243 is a general purpose threadlocker that provides a medium strength bond. This product works on all metals, including passive substrates such as stainless steel, aluminum and plated surfaces. It is proven to be tolerant of minor contamination STEADFAST ADHESIONLOCTITE 243 is designed for the locking and sealing of threaded fasteners which require normal disassembly with standard hand tools. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Suitable for applications on less active substrates such as plated surfaces, where disassembly with hand tools is required for servicing.LOCTITE automotive aftermarket products are not just OEM-specified, they are also designed by auto manufacturers and lab tested. Engines of nearly every professional race car are assembled and maintained with LOCTITE brand adhesives, sealants, gasket makers, and coatings. Whether gasoline or diesel, from bolts and gaskets to cooling lines and core plugs, Henkel products are used to seal, secure, and repair vehicle components. Review: good Review: I bought this to use on a firearm and I must say I am very impressed. I used loctite 242 and it produced some great success but using it in conjunction with oily areas of the rifle, it seems to cause issues. It appears either I had to carefully apply oil or just never oil the area. Then came this product after reading around. The maximum temperature threshold for loctite 242 is about 200 degrees. With Loctite 243 it's almost twice that nearing 360 degrees. On top of that, it is indeed surface insensitive when you apply it. Before going all crazy with this product, I decided to give it a garage science test. My favorites are Loctite 242, and Rocksett and finally the newcomer, 243. I got a scope mount that had set screws to torque it down. What I did was for each screw I would wipe it completely clean with rubbing alcohol, and simply apply each product. Each product worked as advertised and to unscrew I had to apply above average torque to break loose. Then I cleaned it all again and got the stuff off the screw. I then applied a light oil on the surface and wiped it down with a towel the best I could to get it somewhat dry but still have oil on it that you can't see. The loctite 242, and Rocksett both failed. I could unscrew it by hand after waiting 1 week and it even seemed like it was loose before even trying to unscrew it. With loctite 243, it had the same amount of torque required to unscrew it and it was on really tight. It seems like it is working as advertised. My guess is if loctite 243 fail, it will fail due to high temperature but that is expected on a firearm. It's impossible to really say how hot a firearm can get as it depends on how much you shoot and all that. From reading online military manuals, it appears that the expected temperature range depends on location of the barrel. On a rifle, it appears the average temperature for near the muzzle is about 400-600 degrees and this is shooting approximately 1 round per second until 60 rounds are fired. Of course that is on the surface of the barrel and the question is transferring that heat off the barrel to where the set screws are different questions. It's only a matter of time before this is figured out and I believe so long as whatever it is torqued correctly I shouldn't see any issues. Overall I am impressed with this product. It does work very well and I highly recommend it for firearm folks who are looking for something that can still oil over. You don't have to go all crazy with taking off the oil on the screw when you install whatever it is you're installing. However, I still recommend doing that just to be sure you have the best application possible. From there, you can apply oil to your heart desire without worry about it breaking loose. As a side note, another product I'm looking into is loctite 246. This is the same stuff as 243 where it is surface insensitive, BUT it has a higher temperature threshold. I also notice loctite 246 has a expiration date but the loctite 243 doesn't. Not sure what the shelf life is on this but that is another thing I will monitor on my own. ## Features - Causes serious eye irritation. - Causes skin irritation. - May cause an allergic skin reaction. - OEM SPECIFIED. Our LOCTITE automotive aftermarket products are not just OEM-specified, they are also designed by auto manufacturers and lab tested. Wherever engines are being built or repaired, LOCTITE is trusted by professionals. - RELIABLE ADHESION. Works on all metals, including passive substrates (e.g. stainless steel, aluminum, plated surfaces) with improved oil tolerance. - REMOVABLE WITH HAND TOOLS. Well suited for automotive and other applications where maintenance or servicing is required. - MULTI-PURPOSE APPLICATIONS. Rocker studs, rocker adjustment bolts, bolts on valve and cam covers, oil pans, disc brake calipers, intakes and alternators, and pulley assemblies. Ideal for all nut and bolt applications ¼" to ¾" (6 mm to 20 mm). - CONVENIENT CURING. Sets in just 10 minutes & is fully cured in 24 hours. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B005M1RI84 | | Best Sellers Rank | 160,555 in Automotive ( See Top 100 in Automotive ) 684 in Fillers, Adhesives & Sealants 4,124 in Vehicle Oils & Fluids | | Brand | Loctite | | Colour | Blue | | Compatible Material | Metal | | Container Type | Can | | Customer Reviews | 4.8 4.8 out of 5 stars (648) | | Full Cure Time | 24 Hours | | Global Trade Identification Number | 00079340439092 | | Included Components | (1) Threadlocker 243 Surface Insensitive-Medium Strength Bottle, Blue, 36-ml | | Item Form | Bottle | | Item Package Quantity | 1 | | Item Type Name | Loctite 1330906 Threadlocker 243 Surface Insensitive-Medium Strength Bottle, Blue, 36-ml | | Item Volume | 36 Millilitres | | Item Weight | 0.18 Pounds | | Manufacturer | Loctite | | Material | Aluminum,Stainless Steel | | Model Number | 1330906 | | Other Special Features of the Product | Surface insensitive, suitable for fasteners between 1/4-Inch to 3/4-Inch | | Specific Uses For Product | automotive maintenance and repair, parts requiring threadlocking and sealing, medium-strength applications | | UPC | 079340439092 | | Unit Count | 1.22 millilitre | | Viscosity | Medium | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Loctite - **Item form:** Bottle - **Material:** Aluminum,Stainless Steel - **Special feature:** Surface insensitive, suitable for fasteners between 1/4-Inch to 3/4-Inch ## Images ![LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) - Image 1](https://m.media-amazon.com/images/I/71vHzZz7TEL.jpg) ![LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) - Image 2](https://m.media-amazon.com/images/I/71IxZ6TLZBL.jpg) ![LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) - Image 3](https://m.media-amazon.com/images/I/81twwYD8Q4L.jpg) ![LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) - Image 4](https://m.media-amazon.com/images/I/715kPRRX+IL.jpg) ![LOCTITE 243 Threadlocker for Automotive: Medium-Strength, Oil Tolerant, High-Temperature, Anaerobic, General Purpose | Blue, 36 ml Red Bottle (PN: 1330906) - Image 5](https://m.media-amazon.com/images/I/71CcTL4+EgL.jpg) ## Questions & Answers **Q: is there a loctite that resists gasoline ?** A: Most of our Loctite anaerobic sealants and threadlockers will resist gasoline once they're fully cured. The right product will depend on your application requirements. Please call 1-800-LOCTITE (562-8483) to receive a product recommendation from one of our engineers. **Q: How do I open the Loctite 243 bottle?** A: You simply twist the cap and it should open. **Q: Is this good to use on battery cable bolts?** A: Yes this can be used on the threads. Loctite 243 is a plastic so keep it off the post where good electrically conductive contact is required. I am thinking a car battery here. If this is a different design and IF THIS THREADED ASSEMBLY REQUIRES ELECTRICALLY CONDUCTIVY DO NO USE OUR PLASTIC THREADLOCKER IT WILL INSULATE AND GENERATE RESISTANCE. **Q: Can this still be effective on a bolt that is threaded, left to sit, and then threaded again to torque spec?** A: Left for set how long? When you remove the bolt, if it's still wet then yes, but I would wipe it off and reapply because I would want a thicker application for a tighter bond. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by Y***O on 21 October 2021* good ### ⭐⭐⭐⭐⭐ Review *by D***A on 6 June 2015* I bought this to use on a firearm and I must say I am very impressed. I used loctite 242 and it produced some great success but using it in conjunction with oily areas of the rifle, it seems to cause issues. It appears either I had to carefully apply oil or just never oil the area. Then came this product after reading around. The maximum temperature threshold for loctite 242 is about 200 degrees. With Loctite 243 it's almost twice that nearing 360 degrees. On top of that, it is indeed surface insensitive when you apply it. Before going all crazy with this product, I decided to give it a garage science test. My favorites are Loctite 242, and Rocksett and finally the newcomer, 243. I got a scope mount that had set screws to torque it down. What I did was for each screw I would wipe it completely clean with rubbing alcohol, and simply apply each product. Each product worked as advertised and to unscrew I had to apply above average torque to break loose. Then I cleaned it all again and got the stuff off the screw. I then applied a light oil on the surface and wiped it down with a towel the best I could to get it somewhat dry but still have oil on it that you can't see. The loctite 242, and Rocksett both failed. I could unscrew it by hand after waiting 1 week and it even seemed like it was loose before even trying to unscrew it. With loctite 243, it had the same amount of torque required to unscrew it and it was on really tight. It seems like it is working as advertised. My guess is if loctite 243 fail, it will fail due to high temperature but that is expected on a firearm. It's impossible to really say how hot a firearm can get as it depends on how much you shoot and all that. From reading online military manuals, it appears that the expected temperature range depends on location of the barrel. On a rifle, it appears the average temperature for near the muzzle is about 400-600 degrees and this is shooting approximately 1 round per second until 60 rounds are fired. Of course that is on the surface of the barrel and the question is transferring that heat off the barrel to where the set screws are different questions. It's only a matter of time before this is figured out and I believe so long as whatever it is torqued correctly I shouldn't see any issues. Overall I am impressed with this product. It does work very well and I highly recommend it for firearm folks who are looking for something that can still oil over. You don't have to go all crazy with taking off the oil on the screw when you install whatever it is you're installing. However, I still recommend doing that just to be sure you have the best application possible. From there, you can apply oil to your heart desire without worry about it breaking loose. As a side note, another product I'm looking into is loctite 246. This is the same stuff as 243 where it is surface insensitive, BUT it has a higher temperature threshold. I also notice loctite 246 has a expiration date but the loctite 243 doesn't. Not sure what the shelf life is on this but that is another thing I will monitor on my own. ### ⭐⭐⭐⭐⭐ Review *by D***R on 21 September 2015* The 243 formula really makes a difference when used on stainless and other corrosion resistant metals, even with oil or grease contamination, like that you often get in tap holes of anything mechanical like engine, bikes, gears and sprockets, motors, etc. Using the 242, I often observed very poor, if not total lack of thread locking, when using stainless fasteners or in a shop environment, anywhere around greasy or oily parts. With the 243, I still yet to have a failure in thread locking and I've been using it for over a year now. 36mL is a lot cheaper than the 6mL tube and no, it won't go to waste because you used it once a year ago and are afraid it's no good anymore. Simply cap it off properly and it's gonna remain usable for a very long time. Don't forget to shake it up before using it that day, just like you would shake and stir your paint before painting. ## Frequently Bought Together - LOCTITE 243 Automotive Threadlocker Blue - Medium Strength Thread Lock, General Purpose, Oil Tolerant - 36 ml, 1 Pack - Loctite 271 Automotive Threadlocker Red - High Strength Thread Lock, Fluorescent, Heavy-Duty, Works on All Metals - 36 ml, 1 Pack - Loctite 272 Automotive Threadlocker Red – High Temp Thread Lock, Heavy-Duty High Strength Applications, Works on All Metals - 36 ml, 1 Pack --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/149710836-loctite-243-threadlocker-for-automotive-medium-strength-oil-tolerant-high](https://www.desertcart.vu/products/149710836-loctite-243-threadlocker-for-automotive-medium-strength-oil-tolerant-high) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-04*