---
product_id: 45059808
title: "577 Thread Sealant 50 mL Tube | Medium Strength, For Metal Threads"
price: "105.60 DT"
currency: TND
in_stock: true
reviews_count: 13
url: https://www.desertcart.tn/products/45059808-577-thread-sealant-50-ml-tube-medium-strength-for-metal
store_origin: TN
region: Tunisia
---

# Chemical & thermal resistant Medium strength sealant Instant low-pressure seal 577 Thread Sealant 50 mL Tube | Medium Strength, For Metal Threads

**Price:** 105.60 DT
**Availability:** ✅ In Stock

## Summary

> 🔩 Seal it once, trust it forever!

## Quick Answers

- **What is this?** 577 Thread Sealant 50 mL Tube | Medium Strength, For Metal Threads
- **How much does it cost?** 105.60 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/45059808-577-thread-sealant-50-ml-tube-medium-strength-for-metal)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No Primer Needed:** Effective sealing without extra prep, saving you time and hassle
- • **Durable Under Pressure:** Resists chemical, thermal stress, and vibration without shrinking or shredding
- • **Fast & Easy Application:** Gel-like formula cures quickly even on lightly contaminated surfaces
- • **Reliable Leak-Proof Lock:** Seals and locks metal threads instantly for zero leaks
- • **Versatile Metal Compatibility:** Works flawlessly on all metal types and thread styles

## Overview

Loctite 577 is a medium-strength, general-purpose thread sealant designed for metal pipes and fittings. It provides an instant, low-pressure seal that locks threads securely, resists chemicals and heat, and cures quickly without the need for primers—even on lightly contaminated surfaces. Ideal for professionals seeking reliable, leak-proof connections in demanding environments.

## Description

Medium-strength, general purpose thread sealant for straight/straight and straight/taper threads and fittings. Fills the space between threaded parts and seals and locks at the same time. Loctite 577 thread sealant is a medium-strength, general purpose thread sealant for straight/straight and taper/straight threads and fittings. Great for overhead applications and fast application at low temperatures. Excellent chemical and thermal resistance; gel-like form results in less migration of product after application. Loctite 577 is designed for the locking and sealing of metal pipes and fittings as well as other threaded assemblies. The product provides an instant, low-pressure seal for metal pipes and fittings. It will not creep, shrink or shred. Suitable for fast application at low temperatures. Cures on lightly contaminated surfaces and does not require a primer on inactive metals. It has excellent chemical and thermal resistance and offers less migration of liquid product after application to the part.

Review: A must for leak proofing fittings. - It's a great thread sealant for air compressor fittings. Air compressor fittings are prone to leak due to bad cut threads, vibrations, oil and moisture. I have used teflon tape, pipe compound, blue thread lock with various levels of success. Loctite 577 guarantees a leak proof connection every single time. It may seem expensive but you don't even have to go back and check the connects for leaks. Most likely one of the bests thread sealants around for compressed air applications.
Review: Great product by a trusted manufacture - Excellent choice for sealing gas fitting, easy to apply, a little pricey but well worth it for piece of mind that you will have no leaks

## Features

- General purpose, medium strength liquid thread sealant for sealing metal threads
- Suitable for all metals types
- Instant low pressure seal
- Item Package Dimension: 5.0" L x 3.0" W x 1.0" H

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Customer Reviews | 4.6 out of 5 stars 134 Reviews |

## Product Details

- **Brand:** Loctite
- **Item Weight:** 0.07 Pounds
- **Item dimensions L x W x H:** 1 x 1 x 1 inches
- **Material:** Polymer-based material
- **Style:** Compact

## Images

![577 Thread Sealant 50 mL Tube | Medium Strength, For Metal Threads - Image 1](https://m.media-amazon.com/images/I/51xZil+WyrL.jpg)

## Questions & Answers

**Q: Can this be used on natural gas grill orifices?**
A: No. Heat is used to loosen this sealant. Use pipe dope.

**Q: Is this compatible with propane lines?**
A: It should be I never used it 
I did used it on auto gas systems which are a propane mix

**Q: Would I need to use the 7649 primer if I was screwing a brass fitting (active metal) into a stainless steel (inactive metal)?**
A: Actually I would recommend anti-seize compound.  This will lock the thread where anti-seize will prevent reaction between dissimilar metals

## Customer Reviews

### ⭐⭐⭐⭐⭐ A must for leak proofing fittings.
*by P***. on March 12, 2026*

It's a great thread sealant for air compressor fittings. Air compressor fittings are prone to leak due to bad cut threads, vibrations, oil and moisture. I have used teflon tape, pipe compound, blue thread lock with various levels of success. Loctite 577 guarantees a leak proof connection every single time. It may seem expensive but you don't even have to go back and check the connects for leaks. Most likely one of the bests thread sealants around for compressed air applications.

### ⭐⭐⭐⭐⭐ Great product by a trusted manufacture
*by G***. on February 1, 2026*

Excellent choice for sealing gas fitting, easy to apply, a little pricey but well worth it for piece of mind that you will have no leaks

### ⭐⭐⭐⭐⭐ Works great on PVC, SS, and Brass
*by M***K on October 27, 2023*

You have to shake it a lot to mix it if it's been sitting at all. I keep it in the refrigerator hoping that will preserve its shelf life which isn't listed as that long for a non-professional. I usually use teflon tape or the liquid teflon even more. However, you still need to max torque on the fittings and some of the Chinese SS & Brass fittings still leak. If you've got elbows or tees that need a particular alignment, best fitting torque often puts me 180-270 deg. out of alignment. This stuff works great to seal (I was using less than 80 psi) water fittings with a mild snug fit and yet without excess force, is removable. Leaves a lot to clean up on the threads but an easy job. Now my go-to sealant for pipe threads I would typically glue or solder or epoxy. Hope it stores well in the refrig.

## Frequently Bought Together

- 577 Thread Sealant 50 mL Tube
- Loctite 2087067 567 Thread Sealant 50 mL Tube, White (Pack of 1)
- Loctite 1329467 243 Blue Medium Strength Threadlockers, 1.69 Ounces, 50 mL, 3/4" Thread

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-16*