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

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

37397 592 Thread Sealant (50-Mililiter Tube)

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

🔥Temp resistant to 400°F

🔧OEM-approved for pro-grade reliability

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

1808946₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered 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 Vietnam.

Secure transaction

Description

🔩 Seal like a pro, drive with confidence.

VERSATILE FLUID DEFENSE - Seals fuel, oil, coolant, brake, and steering fittings against leaks and corrosion.
ENGINEERED FOR EXTREME HEAT - Withstands up to 400°F to keep your threads leak-proof under pressure.
TRUSTED BY INDUSTRY LEADERS - OEM-approved and tested by top automotive manufacturers for unmatched reliability.
VIBRATION MOISTURE SHIELD - Protects against loosening from vibration and moisture intrusion for lasting durability.
SMOOTH ASSEMBLY REPOSITIONING - Lubricates threads for hassle-free installation and allows 24-hour part repositioning.

Loctite 37397 592 Thread Sealant is a high-viscosity, OEM-approved anaerobic sealant designed for automotive threaded fittings. It delivers reliable leak protection against fuel, oil, coolant, brake, and steering fluids, resists temperatures up to 400°F, and prevents loosening from vibration and moisture. Ideal for professional engine building and repair, it ensures smooth assembly with repositioning flexibility for 24 hours.

Specifications

ASIN	B0002KKTH2
Best Sellers Rank	#99,462 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #102 in Fillers, Adhesives & Sealants
Brand	Loctite
Brand Name	Loctite
Colour	off-white
Compatible Material	Glass, Metal, Plastic, Rubber
Container Type	Tube
Customer Reviews	4.8 out of 5 stars 327 Reviews
Full Cure Time	24 Hours
Global Trade Identification Number	00079340373976
Item Form	Liquid
Item Package Quantity	1
Item Type Name	LOCTITE PST 592 Thread Sealant for Automotive: Low-Pressure, High-Viscosity, Anaerobic, Prevents Galling \| Opaque, Off-White, 50 ml Tube (PN: 483630)
Manufacturer	Loctite
Material	Anaerobic
Material Type	Anaerobic
Model	37397
Other Special Features of the Product	Prevents Galling, Anaerobic
Special Feature	Prevents Galling, Anaerobic
Specific Uses For Product	Fleet and plant maintenance.
UPC	079340373976
Unit Count	50 Milliliters
Viscosity	high
Volume	50 Millilitres
Water Resistance Level	Water Resistant

Reviews

A**R

This stuff is great for any threads that are applied to oil connections ...

10.11.2016

D**Y

Hard to get in local stores

3.08.2023

M**D

Works on Avgas.

26.10.2025

J**N

The right stuff for the job

15.04.2021

T**N

Good stuff

11.08.2020

Common Questions

Are the products genuine and authentic?+

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.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

1808946₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered 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 Vietnam.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

View all Trustpilot reviews