Pro Seal Blue Removable Threadlocker – Medium Strength, 50 mL

Secure threaded fasteners against loosening while maintaining the ability to disassemble them for future service with Pro Seal Blue Removable Threadlocker. This medium-strength anaerobic threadlocker helps lock and seal threaded metal fasteners while allowing removal with hand tools when needed.

The blue liquid cures when confined between assembled metal threads. It is designed for fasteners up to 3/4" in diameter and is a practical choice for automotive, mechanical, power tool, equipment maintenance, and general repair applications exposed to vibration and movement.

Features & Benefits

• Medium-strength blue removable threadlocker

• ANA-LOK 42 anaerobic formula

• Helps prevent threaded fasteners from loosening

• Locks and seals threaded metal components

• Removable with hand tools

• For fasteners up to 3/4" diameter

• Helps prevent galling and corrosion of threads

• Resistant to gasoline, antifreeze, transmission fluid, and oil

• Approximately 5-minute working time

• Full cure in approximately 24 hours

• Temperature range of -65°F to 300°F (-54°C to 150°C)

• Large 50 mL bottle

• Made in the USA

Specifications

Helps Prevent Fasteners from Loosening

Vibration, movement, and repeated equipment operation can gradually loosen threaded fasteners. Pro Seal Blue Threadlocker is applied to the threads before assembly to help keep nuts, bolts, and screws securely in place.

Once cured, the threadlocker fills the space between mating threads, helping resist loosening while also sealing the threaded connection.

Removable Medium-Strength Formula

This blue threadlocker provides medium-strength holding power without creating a connection intended to be permanent.

Fasteners can be removed with hand tools when maintenance, adjustment, or repair is required. This makes it especially useful for serviceable assemblies where additional resistance to loosening is needed but future disassembly is expected.

Anaerobic Cure

Pro Seal ANA-LOK 42 is an anaerobic threadlocker. It cures after being confined between assembled metal threads.

Apply the product to the threads before assembly. Once the fastener is assembled, the threadlocker begins curing within the threaded connection.

The approximate working time is 5 minutes, with full cure reached in approximately 24 hours.

Resistant to Common Automotive Fluids

Once properly cured, Pro Seal Blue Threadlocker provides resistance to several fluids commonly encountered in automotive and mechanical applications, including:

• Gasoline

• Antifreeze

• Transmission fluid

• Oil

It also helps protect threaded connections against galling and corrosion.

For Fasteners Up to 3/4"

Pro Seal 24250 is designed for threaded fasteners up to 3/4" in diameter, making it useful across a broad range of maintenance and repair applications.

Typical applications include:

• Carburetor screws

• Valve cover bolts

• Water pump bolts

• Thermostat bolts

• Rocker arm adjustment nuts

• Power tools

• Mechanical equipment

• Automotive repairs

• Maintenance applications

• Threaded connections exposed to vibration

Wide Operating Temperature Range

Once cured, the threadlocker is rated for temperatures from -65°F to 300°F (-54°C to 150°C), allowing it to be used in a variety of automotive, equipment, and mechanical environments.

50 mL Bottle

This 50 mL bottle provides considerably more threadlocker than the smaller 6 mL version, making it a practical choice for shops, technicians, maintenance departments, and anyone who uses removable blue threadlocker regularly.

For occasional use or smaller repair kits, the 6 mL Pro Seal 24206 version may be a more compact alternative.

How to Use

Apply the threadlocker to the threaded area before assembly, then assemble the fastener normally. The anaerobic formula cures within the assembled metal threads.

For best results, prepare the mating threads properly and follow the manufacturer's application and curing instructions.

Frequently Asked Questions

Is this a permanent threadlocker?
No. This is a medium-strength removable threadlocker designed to secure fasteners while still allowing future disassembly with hand tools.

What does the blue color indicate?
This Pro Seal formulation is the blue, medium-strength removable version. It is intended for applications where fasteners need protection against loosening but may need to be removed later.

What size fasteners can it be used on?
It is designed for threaded fasteners up to 3/4" in diameter.

How much threadlocker is in the bottle?
This bottle contains 50 mL, equivalent to approximately 1.69 fl oz.

How long does it take to cure?
The specified working time is approximately 5 minutes, with full cure in approximately 24 hours.

What temperature range is it rated for?
The specified operating range is -65°F to 300°F (-54°C to 150°C).

Is it resistant to oil?
Yes. The cured product is resistant to oil as well as gasoline, antifreeze, and transmission fluid.

Can the fastener be removed later?
Yes. The medium-strength formulation is designed to allow removal with hand tools.

Does it help protect the threads?
Yes. In addition to helping prevent loosening, the threadlocker helps prevent galling and corrosion of threaded connections.

How does anaerobic threadlocker cure?
The liquid cures after it is confined between mating metal threads during assembly.

What is the difference between 24250 and 24206?
Both are blue removable threadlocker. 24250 contains 50 mL, while 24206 contains 6 mL. The larger 24250 bottle is better suited to frequent shop or maintenance use.

Where is it made?
It is made in the USA.

Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.