Can this be used on natural gas grill orifices?

No. Heat is used to loosen this sealant. Use pipe dope.

Is this compatible with propane lines?

It should be I never used it I did used it on auto gas systems which are a propane mix

Would I need to use the 7649 primer if I was screwing a brass fitting (active metal) into a stainless steel (inactive metal)?

Actually I would recommend anti-seize compound. This will lock the thread where anti-seize will prevent reaction between dissimilar metals

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🔩 Lock it down fast, seal it tight, and never look back!

NO PRIMER NO FUSS - Cures on lightly contaminated surfaces, speeding up your installation process
VERSATILE COMPATIBILITY - Works seamlessly on all metal types and thread styles—straight or tapered
RESILIENT UNDER PRESSURE - Exceptional chemical and heat resistance keeps seals intact in demanding environments
INSTANT LOW PRESSURE SEAL - Achieve quick, leak-proof results without waiting around
RELIABLE METAL THREAD LOCK - Seals and locks metal threads with medium strength for lasting durability

Loctite 577 Thread Sealant is a medium strength, polymer-based liquid designed for sealing and locking metal threaded pipes and fittings. It provides an instant low pressure seal, cures without primer on lightly contaminated surfaces, and offers excellent resistance to heat and chemicals, making it ideal for quick, reliable installations across various metal types and thread configurations.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Manufacturer	ヘンケルジャパン(Henkel Japan)
Part number	2068749
Item Weight	29.5 g
Product Dimensions	2.54 x 2.54 x 2.54 cm; 29.48 g
Is Discontinued By Manufacturer	No
Size	1-(Pack)
Color	yellow
Style	コンパクト。
Material	ポリマーベースの素材
Measurement System	US
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	25 x 25 x 25 mm

(1-(Pack)) - 577 Thread Sealant 50 mL Tube

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