--- product_id: 4840826 title: "1330906 243 Medium Strength Surface Insensitive Threadlocker" brand: "loctite" price: "€ 49.70" currency: EUR in_stock: true reviews_count: 13 category: "Loctite" url: https://www.desertcart.at/products/4840826-1330906-243-medium-strength-surface-insensitive-threadlocker store_origin: AT region: Austria --- # Heat resistant up to 140°F Fits 1/4"–3/4" fasteners Oil tolerant for surface insensitivity 1330906 243 Medium Strength Surface Insensitive Threadlocker **Brand:** loctite **Price:** € 49.70 **Availability:** ✅ In Stock ## Summary > 🔧 Lock it down, loosen up later — the smart threadlocker for pros who demand reliability. ## Quick Answers - **What is this?** 1330906 243 Medium Strength Surface Insensitive Threadlocker by loctite - **How much does it cost?** € 49.70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/4840826-1330906-243-medium-strength-surface-insensitive-threadlocker) ## 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 - • **Easy Disassembly:** Medium strength allows parts to be separated with standard hand tools—strong but service-friendly. - • **Fast Curing Time:** Sets in just 10 minutes and fully cures within 24 hours, accelerating your project turnaround. - • **Oil-Tolerant Formula:** Maintains bond strength even on oily or contaminated surfaces, saving prep time without compromising reliability. - • **Vibration-Proof Security:** Locks and seals components to prevent loosening under shock and vibration—no more mid-drive surprises. - • **Precision Fit for Medium Fasteners:** Engineered for bolts and nuts from 6mm to 20mm, ensuring a perfect hold every time. ## Overview Loctite 1330906 243 is a medium-strength, oil-tolerant threadlocker designed for automotive and general-purpose applications. It secures fasteners from 1/4" to 3/4" (6-20mm), resists vibration and chemical exposure, and cures fully in 24 hours. Trusted by professionals, it bonds to all metals including stainless steel and aluminum, withstanding temperatures up to 140°F while allowing easy disassembly with hand tools. ## Description LOCTITE Automotive Threadlocker Blue 243 is a medium-strength, medium-temp, oil-tolerant adhesive designed for general-purpose automotive applications. OEM-specified and trusted by professionals, this anaerobic threadlocker bonds effectively to all metals, including stainless steel, aluminum, and plated surfaces. Its enhanced oil tolerance ensures reliable performance, even in challenging conditions. LOCTITE Blue 243 is ideal for securing components that endure heavy shock, vibration, and chemical exposure. It works perfectly on rocker studs, adjustment bolts, valve and cam covers, oil pans, disc brake calipers, intakes, alternators, and pulley assemblies. Suitable for all nut and bolt applications ranging from ¼" to ¾" (6 mm to 20 mm). The product sets in just 10 minutes, allowing for a fast start, and reaches full strength within 24 hours, providing a durable, temperature-resistant bond up to 140°F. LOCTITE Blue 243 delivers long-lasting, reliable results for your automotive repair and maintenance needs. Review: Great product for a firearm - 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: The best thread locker in the class - I tried several thread lockers before starting using this one and there is a big difference. It is not necessary to perfectly clean off bolts before applying 243 threadlocker. The thickness of the liquid is just right. It is sufficiently liquid to easily apply to bolts but not too liquid to drip off. The strength of locking is sufficient to prevent bolts release from vibration but is not too strong to affect removing bolts with a screwdriver. I mostly use threadlocker with RC helicopter parts and had a few times bolts coming off in flight. It never happened since I switched to Loctite 243. Highly recommended. The only possible "complaint" is that the container is red color, even though formula is blue (medium strength). I have blue (243), red (271) and green (290) strength loctites in my toolbox and have to read the label to select one. It would have been much easier to have matching strength to container's color. ## Features - DESIGN. Ideal for fasteners between 1/4-Inch to 3/4-Inch (6 mm to 20 mm). - SECURE. Locks and seals while preventing parts from loosening due to vibration. - RESULTS. Secure, one-piece assembly that will not loosen under stress. - EASY TO USE. Parts can be separated using hand tools. - Fit type: Vehicle Specific ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B005M1RI84 | | Best Sellers Rank | #3,844 in Automotive ( See Top 100 in Automotive ) #14 in Thread Lock Sealers | | Brand Name | Loctite | | Color | Blue | | Compatible Material | Metal | | Container Type | Bottle, Can | | Customer Reviews | 4.8 4.8 out of 5 stars (3,241) | | 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 | Liquid | | Item Package Quantity | 1 | | Item Type Name | automotive-thread-lock-sealers | | Item Weight | 0.18 Pounds | | Manufacturer | Loctite | | Material Type | Aluminum,Stainless Steel | | Model | 1330906 | | Other Special Features of the Product | Oil Tolerant, High-Temperature, General Purpose | | Specific Uses For Product | Repair | | UPC | 079340439092 | | Unit Count | 1.22 Fluid Ounces | | Viscosity | Medium | | Volume | 36 Milliliters | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Loctite - **Item Form:** Liquid - **Material:** Aluminum,Stainless Steel - **Special Feature:** Oil Tolerant, High-Temperature, General Purpose - **Specific Uses For Product:** Repair ## Images ![1330906 243 Medium Strength Surface Insensitive Threadlocker - Image 1](https://m.media-amazon.com/images/I/71vHzZz7TEL.jpg) ## Available Options This product comes in different **Size** options. ## 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 ### ⭐⭐⭐⭐⭐ Great product for a firearm *by D***A on June 6, 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. ### ⭐⭐⭐⭐⭐ The best thread locker in the class *by W***L on December 6, 2012* I tried several thread lockers before starting using this one and there is a big difference. It is not necessary to perfectly clean off bolts before applying 243 threadlocker. The thickness of the liquid is just right. It is sufficiently liquid to easily apply to bolts but not too liquid to drip off. The strength of locking is sufficient to prevent bolts release from vibration but is not too strong to affect removing bolts with a screwdriver. I mostly use threadlocker with RC helicopter parts and had a few times bolts coming off in flight. It never happened since I switched to Loctite 243. Highly recommended. The only possible "complaint" is that the container is red color, even though formula is blue (medium strength). I have blue (243), red (271) and green (290) strength loctites in my toolbox and have to read the label to select one. It would have been much easier to have matching strength to container's color. ### ⭐⭐⭐⭐⭐ good stuff *by W***. on September 28, 2025* does the job as advertised! Thank you ## 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.at/products/4840826-1330906-243-medium-strength-surface-insensitive-threadlocker](https://www.desertcart.at/products/4840826-1330906-243-medium-strength-surface-insensitive-threadlocker) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-04-22*