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$13.78Other options: $3.93 to $44.06

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23% above the 6-day averagetracked $42.92 · avg $35.04 · low $31.43 · checked 29 Oct 🛒 Buy on AliExpress →

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$13.78

Blue Thread Locker 243 Bolt Sealant, 50ml, Metal Glue and Rust Protection for Screws and Fasteners

Name: Blue Thread Locker 243 Bolt Sealant, 50ml, Metal Glue and Rust Protection for Screws and Fasteners
SKU: 1005011743119254
Price: 13.78 USD
Availability: InStock

98% positive feedback8,292 reviews 14k+ sold recently🏬 Sold by Stone's Store✓ Picked

AliExpress buyer rating

The percentage shows how many AliExpress buyers rated this product positively. InstaShop does not edit or filter the rating.

✓ Selected for InstaShop by high positive feedback (88%+) and proven sales

✅ Prevents loosening from vibration
✅ Protects against rust and corrosion
✅ Medium strength allows disassembly with hand tools

👤 It suits DIYers and mechanics looking to secure bolts on engines, bikes, or machinery.

Price updated 29 Oct 2026

Price range by option: $3.93 – $44.06

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Options (6):

ℹ️ Final price per option is set on AliExpress.

🚚 Shipping to Israel: $2.41 · 6–11 days (live from AliExpress)

89/100⭐ RecommendedInstaShop Score

Rating

Sales volume

Discount

Computed by InstaShop from the product's real rating, sales volume and discount - an independent editorial signal, not a guarantee. How it is calculated

Secure your bolts and screws with this medium-strength blue thread locker, designed to prevent loosening from vibration while still allowing for future disassembly. It is the perfect reliable choice for automotive enthusiasts, machinery maintenance, and home DIY projects.

📋 Full specs, sizes, materials & detailed description - on the AliExpress product page →

🌍 International price: $13.78 (AliExpress's international listing). Shipping and any import taxes are shown at checkout. Details

Price historyLowest $10.09 (24.10) · full chart ↓

💡 Why buy · InstaShop analysis

👤 Best for: It suits DIYers and mechanics looking to secure bolts on engines, bikes, or machinery.

🚫 Less suitable for: It is less suitable for permanent applications requiring high-strength red locker or for non-metal fasteners.

🔎 Check before buying: Verify that the bolt diameter and material are compatible with medium-strength anaerobic adhesives.

💰 Is the price good? AliExpress lists 50% off, but in our daily tracking the price is higher than usual right now - consider waiting.

Good to know:

Requires curing time before full stress
Only effective on metal surfaces

⭐ Quality & trust: 98% positive feedback from 8,292 AliExpress buyer reviews. Updated daily.

🚚 Tracked shipping · 🔒 AliExpress Buyer Protection · Shipping, customs & returns →

What AliExpress buyers say

98%

positive feedback

8,292 reviews · 14k+ sold recently

The data comes from AliExpress and is updated daily. Full reviews, including buyer photos, are on the AliExpress product page.

See reviews on AliExpress →

InstaShop is a catalog that links to AliExpress. Purchase, shipping and warranty are provided solely by the AliExpress seller; some links are affiliate links (the price to you doesn't change). Terms of Use

📈 Price history

⚠ Higher than usual

Based on InstaShop's daily price tracking on AliExpress since 24.10.2026 · 6 measurements

Today's price

$13.78

checked 29.10

Lowest

$10.09

24.10 · +2 more days at this price

Average · 6 measurements

$11.25

24.10–29.10

All 6 measurements as a table

Date	Price	Change
29.10.2026	$13.78	↑ $0.45
28.10.2026	$13.33	↑ $3.21
27.10.2026	$10.12	↑ $0.03
26.10.2026	$10.09	–
25.10.2026	$10.09	–
24.10.2026	$10.09	–

The final price is set by AliExpress. · How we check fake discounts

🔍 In-depth analysis

The Blue Thread Locker 243 is a medium-strength anaerobic adhesive designed to secure threaded fasteners and prevent them from loosening due to vibration or shock. This 50ml bottle provides a significant volume of sealant suitable for automotive repairs, machinery maintenance, and home DIY projects. As a 'blue' formula, it is intended to lock bolts and screws firmly while still allowing for disassembly using standard hand tools, making it a versatile choice for parts that may require future servicing.

With over 15,000 orders and a high buyer rating, this product has established a strong reputation for reliability in the workshop. It functions by curing in the absence of air when confined between close-fitting metal surfaces. While the listing highlights its rust-resistant properties and suitability for metal connectors, it is important to remember that performance can vary based on the specific metal type and the cleanliness of the threads during application.

✅ Pros

High market trust with a massive number of successful orders and a near-perfect rating.
Medium-strength formula allows for future maintenance without needing specialized heating equipment.
Large 50ml volume offers better long-term value compared to small precision tubes.
Provides an added layer of protection against thread corrosion and leaks.

Cons and cautions

Curing time can be affected by ambient temperature and metal type, requiring patience before putting parts under load.
The generic branding means performance consistency might differ from more expensive industrial name brands.

From our data

Paid shipping to Israel: $2.41 (per the AliExpress shipping quote)
6 variants on one listing: price and spec change with the option you pick
Price moved between $10.09 and $13.78 since 28 Sep (6 tracked days)

This analysis is written with an AI model from the product data (name, category, price, rating and orders), not from a hands-on test. How we choose and score

Who it's for: This adhesive is ideal for DIY mechanics, cyclists, and hobbyists who need to ensure that bolts on engines, frames, or furniture stay put. It is a practical choice for anyone performing routine maintenance where vibration-induced loosening is a constant risk.

Who should skip it: It is not recommended for permanent assemblies that should never be removed, nor is it suitable for plastic fasteners. Those working on high-heat exhaust manifolds should verify if the temperature range meets their specific requirements.

🔎 Check before you buy

Confirm the exact shelf life and expiration date of the current batch.
Verify if the formula is effective on inactive surfaces like stainless steel or plated parts without a primer.
Ask the seller for the maximum operating temperature range for this specific 243 variant.
Check if the bottle is shipped with the necessary air gap required to keep the liquid stable.

💰 Value verdict: Given the high volume of orders and the exceptional buyer rating, this product offers excellent value. The current discount makes it a very competitive alternative to hardware store brands, especially for users who go through sealant frequently. It is a low-risk, high-reward purchase for any standard toolbox.

💡 Tips

Thoroughly degrease both the bolt and the internal threads with a solvent before application for the strongest bond.
Store the bottle upright in a cool, dark place to prevent the adhesive from curing prematurely inside the container.
Apply only a few drops to the engagement area, as over-application can lead to messy runoff and wasted product.

Questions about this product

Can I remove a bolt once this glue has dried?

Yes, the 243 blue formula is designed to be removable using standard hand tools, though it will require more force than an untreated bolt.

Does this work on plastic threads?

No, this is a metal-to-metal adhesive that requires the presence of metal ions and the absence of air to cure properly.

How long does it take to set?

While it begins to fix quickly, you should generally wait several hours for a full cure. Check with the seller for the specific fixture time of this batch.

❓ Questions & Answers

What does it cost in US dollars?

$13.78 - AliExpress's international price at our latest check (29.10.2026). The exact amount in your currency, with shipping, is shown at AliExpress checkout.

Shipping and import taxes to my country?

Delivery to your address, its cost and time depend on the seller and your country; import duty/VAT depends on your country's rules (in the EU, the UK and Australia VAT/GST is usually collected at AliExpress checkout). All of it is shown before you pay.

Shipping, import taxes, returns & Buyer Protection - full answers →