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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Loctite 37397 592 Thread Sealant (50-Mililiter Tube)

Product ID: 302072217

Details

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

💧Water & fluid resistant seal

🔥Withstands up to 400°F

🔧OEM-approved for pro-grade reliability

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Description

🔩 Seal like a pro, drive with confidence!

VERSATILE LEAK PROTECTION - Secures fuel, oil, coolant, brake, and steering fittings against leaks and vibration loosening.
ENGINEERED FOR EXTREME HEAT - Keeps seals leak-proof even at 400°F, perfect for high-temp automotive demands.
TRUSTED BY INDUSTRY LEADERS - OEM-specified and tested by top auto manufacturers for unmatched professional-grade performance.
SMOOTH ASSEMBLY REPOSITIONING - Thread lubrication allows hassle-free installation and part repositioning up to 24 hours post-application.
DURABLE DEFENSE AGAINST ELEMENTS - Resists moisture, hydraulic fluids, diesel fuels, and prevents galling for long-lasting reliability.

Loctite 37397 592 Thread Sealant is a 50 ml high-viscosity, anaerobic sealant designed for automotive threaded fittings. OEM-approved and trusted by professionals, it withstands extreme temperatures up to 400°F, prevents leaks from fuel to brake lines, and offers smooth assembly with repositioning flexibility. Water and fluid resistant, it ensures durable, vibration-proof seals for lasting engine and vehicle performance.

Specifications

ASIN	B0002KKTH2
Are batteries included?	No
Best Sellers Rank	#26,541 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #38 in Fillers, Adhesives & Sealants
Brand	Loctite
Colour	off-white
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (345)
Date First Available	17 September 2013
Generic Name	LOCTITE PST 592 Thread Sealant for Automotive: Low-Pressure, High-Viscosity, Anaerobic, Prevents Galling \| Opaque, Off-White, 50 ml Tube (PN: 483630)
Item Dimensions LxWxH	20.3 x 9.7 x 3 Centimeters
Item Height	1.2 Inches
Item Weight	90.7 g
Item Width	3.81 Inches
Item model number	37397
Manufacturer	Loctite
Model number	37397
Net Quantity	1.69 Fluid Ounces
Product Dimensions	20.32 x 9.69 x 3.05 cm; 90.72 g
Special Feature	Prevents Galling, Anaerobic
Specific Product Use	Fleet and plant maintenance.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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S$62

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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