{"product_id":"loctite-threadlocker-243-medium-strength-blue-threadlocker-for-6-20-mm-fasteners-oil-tolerant-and-removable","title":"Loctite Threadlocker 243 Medium-Strength Blue Threadlocker for 6–20 mm Fasteners, Oil-Tolerant and Removable","description":"\u003cp\u003e\u003cstrong\u003eLoctite 243 is a medium-strength, oil-tolerant anaerobic threadlocker that secures metal fasteners from 6 mm to 20 mm against loosening from vibration while allowing later disassembly with hand tools.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis blue Loctite formula is designed for general automotive and industrial use where parts face shock, vibration, and moderate chemical exposure. OEM-specified and widely used by mechanics, the compound bonds to a wide range of metals — including stainless steel, aluminum, and plated surfaces — and works even when surfaces are not perfectly clean or dry. It sets quickly for rapid handling and develops full strength within 24 hours, delivering temperature-resistant performance up to about 140°F (60°C).\u003c\/p\u003e\n\n\u003ch3\u003eHow quickly does Loctite 243 set and reach full strength?\u003c\/h3\u003e\n\u003cp\u003eThe threadlocker develops initial handling strength in roughly 10 minutes, allowing you to move on to the next step of a repair or assembly. Full cure is typically achieved within 24 hours under normal conditions, providing a durable bond for long-term service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInitial fixture: ~10 minutes\u003c\/li\u003e\n  \u003cli\u003eFull cure: ~24 hours\u003c\/li\u003e\n  \u003cli\u003eCure speed depends on metal contact and absence of oxygen\u003c\/li\u003e\n  \u003cli\u003eFaster cure in tighter metal-to-metal assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich fasteners and materials is this threadlocker suitable for?\u003c\/h3\u003e\n\u003cp\u003eLoctite 243 is formulated for nut-and-bolt applications from 1\/4\" to 3\/4\" (6 mm–20 mm) and bonds reliably to most common automotive metals. It tolerates residual oil better than many anaerobic adhesives, so it performs well on parts that are difficult to fully degrease.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for bolts, studs, and threaded assemblies 6–20 mm\u003c\/li\u003e\n  \u003cli\u003eWorks on steel, stainless steel, aluminum, and plated parts\u003c\/li\u003e\n  \u003cli\u003eCommon uses: valve covers, alternators, pulleys, calipers\u003c\/li\u003e\n  \u003cli\u003eOil-tolerant for less-than-perfect surface prep\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I remove parts treated with Loctite 243, and how?\u003c\/h3\u003e\n\u003cp\u003eYes — this is a medium-strength threadlocker designed to prevent loosening while still allowing disassembly with standard hand tools. Hand tools or controlled heating will typically release the bond when maintenance or replacement is required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for removal with hand tools\u003c\/li\u003e\n  \u003cli\u003eApply torque as you would for untreated fasteners\u003c\/li\u003e\n  \u003cli\u003eFor stubborn joints, controlled heat can speed removal\u003c\/li\u003e\n  \u003cli\u003eNot permanent — intended for serviceable assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat environmental and performance limits should I expect?\u003c\/h3\u003e\n\u003cp\u003eLoctite 243 resists moderate temperatures and chemicals commonly found in vehicle environments but is not intended as a high-temperature gasket sealant. It provides dependable vibration resistance in applications up to around 140°F (60°C).\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTemperature resistance: up to approximately 140°F (60°C)\u003c\/li\u003e\n  \u003cli\u003eResists vibration, shock, and common automotive fluids\u003c\/li\u003e\n  \u003cli\u003eNot formulated for extreme high-temperature continuous exposure\u003c\/li\u003e\n  \u003cli\u003eBest for mechanical thread locking, not for sealing pressurized fluids\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Loctite 243 is aimed at professional mechanics, DIY automotive enthusiasts, and maintenance technicians who need a reliable, serviceable threadlocker for medium-size fasteners. It is ideal when you require a balance between secure locking and the ability to disassemble parts later — for items such as rocker studs, adjustment bolts, valve and cam covers, oil pans, disc brake calipers, alternators, and pulley assemblies. Choose Loctite 243 when you want a trusted, OEM-specified threadlocker that performs even with some oil contamination and delivers quick handling times and durable results.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Loctite 243 removable with hand tools?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s a medium-strength threadlocker designed to be removed with standard hand tools; heat can assist stubborn joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can Loctite 243 be used on oily surfaces?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This formula is oil-tolerant and performs better than many anaerobic adhesives on less-than-perfectly-clean metal surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Loctite","offers":[{"title":"Default Title","offer_id":48086214246558,"sku":"B005M1RI84","price":42.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/loctite-243-front-label.jpg?v=1785889981","url":"https:\/\/northtrailauto.ca\/products\/loctite-threadlocker-243-medium-strength-blue-threadlocker-for-6-20-mm-fasteners-oil-tolerant-and-removable","provider":"North Trail Auto","version":"1.0","type":"link"}