--- product_id: 258211059 title: "56521 High Performance Thread Sealant,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/Hand Tools 50 ml" brand: "permatex" price: "£35.35" currency: GBP in_stock: true category: "Permatex" url: https://www.desertcart.co.uk/products/258211059-56521-high-performance-thread-sealant-thread-lock-and-screw-glue store_origin: GB region: United Kingdom --- # 1000 PSI leak-proof seal Locks threads tight Withstands -60°F to 300°F 56521 High Performance Thread Sealant,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/Hand Tools 50 ml **Brand:** permatex **Price:** £35.35 **Availability:** ✅ In Stock ## Summary > 🔧 Lock it down, seal it tight — the pro’s secret weapon! ## Quick Answers - **What is this?** 56521 High Performance Thread Sealant,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/Hand Tools 50 ml by permatex - **How much does it cost?** £35.35 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/258211059-56521-high-performance-thread-sealant-thread-lock-and-screw-glue) ## Best For - permatex enthusiasts ## Why This Product - Trusted permatex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched Seal & Hold:** Combines thread sealant and blue thread locker for ultimate leak and loosening protection. - • **Pressure-Proof Performance:** Secures fittings with an airtight, watertight seal up to 1000 PSI—no leaks, no worries. - • **Clean, Tape-Free Application:** Replaces messy pipe tape and dope with a smooth, professional-grade sealant for metal threads. - • **Extreme Temperature Resilience:** Operates flawlessly from freezing -60°F to scorching 300°F without breaking down. - • **Rapid Cure, Heavy-Duty Strength:** Fast curing formula handles up to 10,000 PSI, perfect for demanding industrial and DIY tasks. ## Overview Permatex 56521 High Performance Thread Sealant is a dual-action formula combining thread sealing and locking to prevent leaks, loosening, and corrosion. It delivers a watertight seal up to 1000 PSI and rapidly cures to withstand pressures up to 10,000 PSI. Temperature resistant from -60°F to 300°F, it’s ideal for metal and tapered pipe threads in automotive and industrial applications, replacing traditional tapes and dopes with a cleaner, faster solution. ## Description Permatex High Performance Thread Sealant offers the ultimate sealing power with the added strength of a blue thread locker. This versatile sealant creates an airtight, watertight hold that prevents leaks, loosening, and corrosion, even under high pressures and temperatures. It seals connections up to 1,000 PSI, with a rapid cure capable of withstanding 10,000 PSI, ensuring leak-proof reliability for your toughest jobs. Temperature resistant from -60°F to 300°F, it’s designed specifically for metal and tapered pipe thread fittings, delivering protection against galling, rust, and corrosion over time. Ideal for stainless steel fittings, oil PSI sending units, oil and coolant lines, intake manifold switches, rear axle fill plugs, fuel fittings, and more, this high-performance thread sealant replaces traditional pipe tape and dope with a faster, cleaner application. Keep your metal connections locked and secure without the risk of leaks, making this sealant a must-have for both professional mechanics and DIY enthusiasts who need lasting, high-strength results. ## Features - Unbeatable Seal & Hold: Combines the sealing power of thread sealant with the firm hold of a blue thread locker, ensuring connections stay tight and leak-free even under pressure. - High-Pressure, No-Leak Assurance: Delivers an airtight, watertight seal up to 1000 PSI, locking fittings securely against leaks in the toughest conditions. - Temperature Resistant & Durable: Withstands extreme temperatures from -60°F to 300°F, protecting threads from rust, corrosion, and wear. - Fast-Curing Strength: Rapidly cures to handle up to 10,000 PSI, making it perfect for heavy-duty applications like stainless steel fittings, oil lines, and fuel systems. - No More Tape or Pipe Dope Needed: Replaces messy alternatives with a smooth, reliable sealant that’s designed for metal, tapered pipe thread fittings—ideal for professional and DIY projects alike. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000FW7VHI | | Best Sellers Rank | #53,972 in Automotive ( See Top 100 in Automotive ) #197 in Automotive Fillers, Adhesives & Sealants | | Department | Thread Sealants | | Item model number | 56521 | | Manufacturer | Permatex | | Product Dimensions | 20.32 x 7.62 x 5.08 cm; 49.9 g | ## Product Details - **Material:** Rubber - **Brand:** Permatex - **Style:** Thread Sealant - **Item weight:** 0.11 Pounds - **Item dimensions L x W x H:** 20.3 x 7.6 x 5.1 centimeters ## Images ![56521 High Performance Thread Sealant,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/Hand Tools 50 ml - Image 1](https://m.media-amazon.com/images/I/71XJlR1DA2L.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: Does this stuff seal pneumatic (800 psi) threads on an and npt fittings.** A: I’ve not used it for your application however, her is the product discription for reference Formulated for metal, tapered ppe thread fittings. Protects threaded areas from rust and corrosion. Uses: head bolts, oil senders, oil and coolant lines, fuel fittings. Features & details Cures rapidly to withstand 10,000 PSI Perfect as a replacement for Vibra-Seal pre-coated parts Prevents galling and protects mated threaded areas from rust and corrosion **Q: Can this be used on plastic pipe** A: Here is a copy and paste of the product description. "Formulated for metal, tapered ppe thread fittings. Protects threaded areas from rust and corrosion. Uses: head bolts, oil senders, oil and coolant lines, fuel fittings". Hope this helps. **Q: What's the difference between this & Special Edition? I need 2 use it 2 seal inline fuel filter thread brass fitting 4 a motorcycle tank 2 carb.** A: I tried a number of things to seal a brass tee into a motorcycle oil pressure outlet. Nothing worked 'til I tried this stuff. Be sure to clean the threads well beforehand. If the stuff is rated for fuel, I'm sure it'll work for your application. It's good stuff. **Q: What's the difference between this & Special Edition? I need 2 use it 2 seal inline fuel filter thread brass fitting 4 a motorcycle tank 2 carb.** A: The special edition is no doubt like many other products listed on Amazon a seller attempting to use the false label of a "special edition" to lure buyers to buy from them at a higher price, without prime shipping and more often than not slower shipping. I am willing to bet if you contact the maker of the product that they do not produce a "special edition". ## Frequently Bought Together - Permatex 56521 High Performance Thread Sealant ,Thread Lock & Screw Glue for Bolts Nuts & Fasteners to Prevent Loosening & Corrosion, Removable w/ Hand Tools 50 ml - Permatex 85080 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 9.5 oz - Permatex 22058 Dielectric Tune-Up Grease, 3oz. - High Performance Dielectric Grease Used To Protect Terminals, Spark Plugs, Wiring And Other Electrical Connections Against Salt, Dirt, And Corrosion --- ## 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.co.uk/products/258211059-56521-high-performance-thread-sealant-thread-lock-and-screw-glue](https://www.desertcart.co.uk/products/258211059-56521-high-performance-thread-sealant-thread-lock-and-screw-glue) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-07-19*