Loctite 37397 592 Thread Sealant (50-Mililiter Tube)

Loctite 37397 592 Thread Sealant (50-Mililiter Tube)

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

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Product ID: 302072217

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Details

Brand
Loctite
Specific Uses For Product
Automotive
Item Form
Liquid
Colour
off-white
Item Package Quantity
1

💧Leak Prevention

🔥400°F Resistance

🔧OEM Specified

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Description

🔒 Seal the Deal with Confidence!

USER FRIENDLY DESIGN - Easily lubricates threads for hassle-free assembly and repositioning within 24 hours.
UNMATCHED RELIABILITY - Engineered for professionals, LOCTITE is the go-to for automotive sealing.
VERSATILE APPLICATION - Perfect for fuel, oil, coolant lines, and more—your all-in-one solution.
HIGH TEMPERATURE PERFORMANCE - Withstands extreme conditions up to 400°F, ensuring durability.
MOISTURE VIBRATION RESISTANT - Say goodbye to leaks and loosening; this sealant stands strong against the elements.

The Loctite 37397 592 Thread Sealant is a professional-grade, OEM-specified solution designed for automotive applications. This 50-milliliter tube provides reliable sealing for threaded metal fittings, preventing leaks in high-temperature environments up to 400°F. Its unique formulation resists moisture, vibration, and various automotive fluids, making it an essential tool for any mechanic or DIY enthusiast.

Specifications

Brand	Loctite
Specific Uses For Product	Automotive
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
Product Dimensions	20.32 x 9.69 x 3.05 cm; 82 g
Item model number	483630
Manufacturer Part Number	LOC483630
OEM Part Number	37397
Country of Origin	USA
Item Weight	82 g

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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