{"product_id":"loctite-flange-sealant-gasket-maker-515-50-ml-anaerobic-seals-gaps-to-0-25-mm","title":"Loctite Flange Sealant Gasket Maker 515 — 50 ml anaerobic, seals gaps to 0.25 mm","description":"\u003cp\u003e\u003cstrong\u003eLoctite 515 is an anaerobic, form-in-place gasket maker for rigid machined metal flanges, sealing gaps up to 0.25 mm and replacing preformed gaskets.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis methacrylate-based flange sealant is engineered for use on tightly machined flange faces where a durable, flexible gasket is needed. It cures in the absence of air (anaerobically) to form a resilient seal that resists oil, coolant, and typical automotive service conditions. LOCTITE 515 is OEM approved and commonly used by professionals on pumps, thermostat housings, transmission pans, compressor covers and axle housings — applications where precision fit and vibration resistance are essential.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Loctite 515 perform on machined metal flanges?\u003c\/h3\u003e\n\u003cp\u003eLoctite 515 bonds to metal flange faces and cures to a flexible gasket that accommodates slight movement without cracking. It is formulated for rigid flanges with very small gaps and eliminates the need for pre-cut paper, rubber, or cork gaskets.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCures anaerobically to form a continuous gasket on contact faces.\u003c\/li\u003e\n  \u003cli\u003eDesigned for gaps up to 0.25 mm (0.015\"), perfect for precision-machined surfaces.\u003c\/li\u003e\n  \u003cli\u003eFlexes with flange movement to maintain a leak-resistant seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat automotive or industrial parts is it best suited for?\u003c\/h3\u003e\n\u003cp\u003eThis sealant is intended for components where a custom, formed gasket improves sealing and serviceability. It’s frequently used on water pumps, thermostats, transmissions and other housings that require a medium-strength, solvent-resistant seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWater pumps, thermostat housings, and cooling system components.\u003c\/li\u003e\n  \u003cli\u003eTransmission pans, transmission case covers and transaxle casings.\u003c\/li\u003e\n  \u003cli\u003eCompressor housings, axle covers and places where O-ring replacement or formed gaskets are needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long does it take to set and how strong is the cured gasket?\u003c\/h3\u003e\n\u003cp\u003eLoctite 515 offers a medium cure speed with an approximate fixture time near 30 minutes under typical conditions, reaching functional strength as it fully cures anaerobically. The product provides a medium tensile shear strength suitable for many automotive and light industrial sealing tasks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTypical fixture time: around 30 minutes (varies with joint size and conditions).\u003c\/li\u003e\n  \u003cli\u003eMedium tensile shear strength: about 6 N\/mm² when cured.\u003c\/li\u003e\n  \u003cli\u003eFinal cure depends on absence of air and contact with metal surfaces for optimal polymerisation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I apply Loctite 515 safely and get best results?\u003c\/h3\u003e\n\u003cp\u003ePrepare clean, dry, oil-free flange faces before applying. Apply an even bead, assemble while the sealant is still uncured, and avoid disturbing the joint until initial fixture to form a continuous, reliable gasket.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean mating surfaces of oil, grease, old gasket material and dirt.\u003c\/li\u003e\n  \u003cli\u003eApply continuous bead to one flange; assemble within recommended open time.\u003c\/li\u003e\n  \u003cli\u003eAllow anaerobic cure; avoid pressure testing until cured to recommended strength.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Loctite 515 is aimed at professional mechanics, restoration specialists and serious DIYers who work on engines, transmissions and machined housings that require precise, reliable sealing without preformed gaskets. It suits situations where OEM-level performance and a form-in-place solution simplify assembly, reduce inventory of pre-cut gaskets, and provide a flexible, oil- and coolant-resistant seal for long-term service.\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: Can Loctite 515 replace preformed gaskets?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It forms a custom gasket on machined flanges, eliminating paper, rubber, or cork gaskets for gaps up to 0.25 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Loctite 515 suitable for coolant and oil-exposed parts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It cures to a solvent-resistant, flexible gasket designed for water pumps, thermostat housings and transmission components.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Loctite","offers":[{"title":"Default Title","offer_id":67593514975417,"sku":"B0002KKTTA","price":57.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/loctite-515-front-tube-50ml.jpg?v=1790576381","url":"https:\/\/redleafauto.ca\/products\/loctite-flange-sealant-gasket-maker-515-50-ml-anaerobic-seals-gaps-to-0-25-mm","provider":"Redleaf Auto","version":"1.0","type":"link"}