J-B Weld Perma-Lock™ Blue Medium Strength Threadlocker

J-B Weld Perma-Lock™ Blue Medium Strength Threadlocker is a medium-strength thread locking and sealing compound designed to help prevent threaded fasteners from loosening due to shock and vibration. It provides a reliable hold while still allowing fasteners to be removed using standard hand tools when maintenance or disassembly is required.

Ideal for automotive, mechanical, workshop and general maintenance applications, Perma-Lock™ Blue can be used on suitable threaded fasteners ranging from 1/4 inch to 1 inch in size.

The medium-strength formulation makes it particularly useful for applications where bolts and screws need to remain securely in place during operation but may need to be removed at a later date. It is ideal for rocker arms, stud bolts, frame bolts, fasteners, bushings, loose screws and other vibration-sensitive components.

By locking and sealing threaded fasteners, J-B Weld Perma-Lock™ Blue helps reduce the risk of unwanted loosening caused by repeated movement, vibration and shock. This makes it useful for vehicles, machinery, mechanical equipment and body assemblies.

Perma-Lock™ Blue is temperature resistant up to 148°C (300°F), providing dependable performance across a wide variety of mechanical environments.

The product is also OEM approved, making it suitable for applications where a dependable medium-strength threadlocker is required to help keep bolts, screws and other threaded fasteners secure.

For anyone searching for a blue threadlocker, medium-strength thread lock, removable bolt locking compound or vibration-resistant thread sealant, J-B Weld Perma-Lock™ Blue provides a practical solution that combines reliable holding power with hand-tool disassembly.

Key Benefits

• Medium-strength blue threadlocker

• Locks and seals threaded fasteners

• Helps prevent bolts and screws from loosening

• Resistant to loosening caused by vibration

• Helps protect against shock-related fastener movement

• Designed for removable fastener applications

• Can be disassembled using standard hand tools

• Ideal where future maintenance may be required

• Suitable for 1/4in to 1in fasteners

• Temperature resistant up to 148°C / 300°F

• Suitable for automotive applications

• Ideal for mechanical components

• Suitable for body assemblies

• Useful for rocker arms

• Suitable for stud bolts

• Ideal for frame bolts

• Useful for bushings and fasteners

• Helps secure loose screws

• Ideal for vibration-sensitive components

• Suitable for workshop and maintenance applications

• OEM approved

How to Use

• Make sure the threaded fastener and mating threads are clean and suitably prepared before application.

• Remove dirt, grease, oil and other contamination that could interfere with the threadlocker's performance.

• Apply J-B Weld Perma-Lock™ Blue to the threaded section of the fastener according to the manufacturer's instructions.

• Ensure sufficient product is applied to the threads that will engage with the mating component.

• Assemble and tighten the fastener to the required specification.

• Allow the threadlocker to cure according to the manufacturer's instructions before subjecting the assembly to normal operating conditions.

• For future maintenance, medium-strength Perma-Lock™ Blue is designed to allow disassembly using standard hand tools.

• Always follow the equipment manufacturer's specified tightening or torque requirements.

• Follow all application and safety instructions supplied with the product.

Typical Applications

• Rocker arms

• Stud bolts

• Frame bolts

• Threaded fasteners

• Bushings

• Loose screws

• Vibration-sensitive components

• Automotive assemblies

• Mechanical equipment

• Body assemblies

• Machinery

• Workshop repairs

• Maintenance applications

• Bolts requiring future removal

Product Information

Brand: J-B Weld
Product: Perma-Lock™ Blue Threadlocker
Strength: Medium
Colour: Blue
Type: Thread locking & sealing compound
Suitable Fastener Size: 1/4in to 1in
Maximum Temperature Resistance: 148°C / 300°F
Removable: Yes, designed for disassembly with hand tools
Vibration Resistant: Helps prevent vibration-related loosening
Shock Resistant: Helps prevent shock-related loosening
OEM Approved: Yes
Applications: Automotive, mechanical & general threaded fasteners
Primary Use: Locking and sealing fasteners while allowing future disassembly

Data Sheets:
Data Sheet
Data Sheet
Data Sheet

WEEE Recycling Producer Registration Number:12889

How do I return my old product to be recycled?

You can return your old product to MyDIY. Waste Electrical and Electronic Equipment (WEEE) is taken back free of charge on a one-for-one, like-for-like basis. Waste batteries including rechargeable batteries are taken back free of charge. You are not obliged to make any purchase when returning old batteries. Each local authority must also accept household WEEE and small batteries free of charge at its recycling facilities. All WEEE and waste batteries must be recycled and should not be placed in any of your household wheelie bins. Make sure you always recycle all your old electrical goods and batteries.

What products can I recycle for free?

You can return anything that is electricaly powered or battery powered. Even your old bicycle lamps can be recycled!.

Do you take back used batteries?

Yes we do. The batteries that we accept are AA, AAA, C or D, powertool batterys and also the flat batteries that are found in watches and toys. Unfortunately we do not accept back any Industrial or car batteries.

Do I need to have made a purchase at MyDIY.ie?

No you don't. You can recycle any of the above items at our store in Inchicore Dublin 8, even if you have not made a purchase with us.

Will you collect my old product?

Yes, but we must be notafied within 14 days of purchase date. You can still arrange to have your old appliance recycled free of charge. Simply bring it back to our Inchicore store and we will ensure that it is disposed of in an environmentally friendly manner.

How much will it cost?

There is no charge to return products to any of our warehouses.

Why should I recycle with MyDIY?

We will ensure that your old product is disposed of correctly to reduce the potentially harmful effects caused on the environment and to conserve natural resources. Further information can be found on weeeireland.ie.

EMC (Environmental Management Cost) Included in the purchase price. 

Gas discharge lamps, LFLs and CFLs €0.15

LED lamps and luminaires €0.05

Large appliances €5.00

Information

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We ship all orders via DPD, one of Ireland’s most trusted couriers. With DPD’s one-hour delivery window, you won’t have to wait around all day for your MyDIY.ie order!

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Each product on our website is marked with an estimated delivery time. If you order multiple items, your order will arrive based on the item with the longest delivery time. For example, if you buy two next-day items and one 3-day item, the entire order will arrive in 3 days.

While most products arrive in 1-2 days, we offer over 44,000 items, so please allow 4-5 working days for some deliveries. Need it faster? Call us at 01-446692, and we'll do our best to help.

Delivery Charges

• FREE delivery for orders over €150 within Ireland.

• Orders under €150: €8.99 delivery fee.

• International delivery: Charges based on weight—contact us for a quote.

When Will I Receive My Order?

• Most orders ship on a 24-hour courier service (2 working days).

• Larger orders may take 4-5 days, and pallet deliveries require scheduling.

• Orders placed before 2 PM usually ship within 24 hours.

• Orders after 1:30 PM Friday or on weekends ship the following week.

• Busy holiday periods may cause slight delays beyond our control.

Do I Need to Be Home for Delivery?

Yes, someone must sign for deliveries due to item value. If you're not home, DPD will leave a card with re-delivery or collection instructions. After two failed attempts, your order may be returned to us, and a re-delivery fee may apply.

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We carefully pack all orders, but if something arrives damaged or incomplete, contact us within 24 hours. Report shortages within 3 days of delivery.

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We ship to Europe and worldwide, with charges based on weight. Liquid products cannot be shipped internationally due to regulations. Contact us for a quote—we're happy to help!

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