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LOCTITE 592 Automotive Opaque Thread Sealant - High-Pressure, High-Viscosity, Prevents Galling - 50 ml, 1 Pack

LOCTITE 592 Automotive Opaque Thread Sealant - High-Pressure, High-Viscosity, Prevents Galling - 50 ml, 1 Pack

Q: How much should I apply to the threads on a hydraulic fitting? It says 3/4 of a thread but I don’t know how much that really is...

Loctite 592 has a ribbon style nozzle, wide slot for discharge. The correct method is to hold the end of the nozzle up against the side of the fitting, so the width of the slot opening is across a few threads. As you squeeze the tube gently and dispense the sealant into the root of the threads, slide the nozzle around the fitting in order to go ¾ of the way around the tube. Feel free to go 360° around if you wish. That’s a little excess material but won’t really hurt. You end up with sealant in the root of the treads only, which is enough. Hope that helps.

Q: Is the "activator" necessary or will the sealant work without it?

While the manufacturer recommends cleaning with their cleaner (that just happens to be a primer and activator) I have used the 592 thread sealant and even the 518 gasket maker with other cleaners such as vm&p naphtha (that is not a primer or activator) with excellent results. A primer is recommended when both surfaces are considered "inactive". The Loctite primer defines what this is.

Q: How strong is the thread locker? Can fittings be removed?

This is not thread locker. This is thread sealant (like pipe dope). You will be able to remove the fittings.

Q: I have a brass engine coolant temperature gauge leaking. Do i have to drain the coolant before using and let dry completely?

The fitting must be clean and dry prior to applying the 592, and it should be allowed to cure for at least 24 hours (preferably 72) before adding the coolant back into the system. Any other questions, please reach out to our technical team at 1-800-LOCTITE

Product ID: 12372323

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Details

Brand
Loctite
Specific Uses For Product
Fleet and
Material
Acrylic Metal
Item Form
Liquid
Special Feature
Strong

⏳24-hour repositioning window

🔥Resists temps up to 400°F

🔧OEM-approved high-pressure sealant

Description

🔩 Lock it down with LOCTITE — the pro’s choice for leak-proof confidence!

VIBRATION LEAK DEFENSE - Blocks moisture, hydraulic fluids, and diesel fuel intrusion
HEAT RESISTANT RELIABILITY - Maintains integrity in extreme temps up to 400°F
SMOOTH ASSEMBLY FLEXIBILITY - Lubricates threads for hassle-free install and 24-hour part repositioning
UNYIELDING SEAL UNDER PRESSURE - Secures fuel, oil, brake & steering fittings with confidence
TRUSTED BY PROS APPROVED BY OE MS - Engineered and tested for top-tier automotive performance

LOCTITE 592 is a 50 ml high-viscosity automotive thread sealant, OEM-approved and trusted by engine builders worldwide. It delivers durable, leak-proof seals in high-pressure applications, resisting temperatures up to 400°F and protecting against vibration, moisture, and harsh fluids. Its thread lubrication allows easy assembly and repositioning for up to 24 hours, ensuring professional-grade reliability and convenience.

Have a Question? See What Others Asked

How much should I apply to the threads on a hydraulic fitting? It says 3/4 of a thread but I don’t know how much that really is...

Is the "activator" necessary or will the sealant work without it?

How strong is the thread locker? Can fittings be removed?

I have a brass engine coolant temperature gauge leaking. Do i have to drain the coolant before using and let dry completely?

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