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.

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.

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.

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

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🔩 Seal like a pro, drive with confidence!

VERSATILE APPLICATION - Seals fuel, oil, coolant, brake, and steering fittings with unmatched reliability.
LONG LASTING PROTECTION - Defends against vibration loosening, moisture, hydraulic fluids, and diesel fuels to keep your systems secure.
TRUSTED BY INDUSTRY LEADERS - OEM-approved and tested by top automotive manufacturers for professional-grade results.
SMOOTH ASSEMBLY REPOSITIONING - Lubricates threads for hassle-free installation and allows 24-hour repositioning flexibility.
ENGINEERED FOR EXTREME CONDITIONS - Withstands high pressure and temperatures up to 400°F for leak-proof performance.

Loctite 37397 592 Thread Sealant is a high-viscosity, OEM-approved liquid sealant designed for automotive and industrial threaded fittings. It provides durable, leak-proof seals resistant to extreme temperatures (up to 400°F), moisture, and various fluids. Trusted by professionals worldwide, it ensures smooth assembly with repositioning flexibility and long-lasting protection against vibration and loosening.

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Brand	Loctite
Specific Uses For Product	Fleet and plant maintenance.
Item Form	Liquid
Colour	off-white
Item Package Quantity	1
Package Information	Tube
Item Volume	50 Millilitres
Viscosity	high
Full Cure Time	24 Hours
Water Resistance Level	Water Resistant
Net Quantity	1.69 millilitre
UPC	079340373976
Global Trade Identification Number	00079340373976
Manufacturer	Loctite
Model	483630
Product Dimensions	20.32 x 9.69 x 3.05 cm; 82 g
Item model number	37397
Manufacturer Part Number	483630
OEM Part Number	37397
Assembly Required	No
Country of Origin	USA
Item Weight	82 g

Loctite 37397 592 Thread Sealant (50-Mililiter Tube)

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