Pratley Pratlok Grade 10-20 is a high-strength, anaerobic thread locker specifically engineered for medium to large bolts and studs between M10 and M20. It is designed for industrial, mechanical, and automotive applications where heavy vibration or high stress may otherwise loosen threaded assemblies.

When applied to metal threads, the adhesive cures in the absence of air, forming a strong bond that prevents both leaks and loosening. Unlike weaker thread lockers, this high-strength formula provides a permanent hold that can only be disassembled with heat, ensuring reliable performance even in the most demanding conditions.

Key Features

• Designed for studs, bolts, and pipe fittings sized M10–M20

• Anaerobic curing locks fasteners securely in place

• Prevents loosening caused by vibration, pressure, or impact

• High-strength formula—requires heat for disassembly

• Resistant to oils, fuels, coolants, and industrial fluids

Applications

The Pratley Pratlok Grade 10-20 is suitable for a wide range of heavy-duty applications. For example, it is ideal for:

• Industrial machinery: securing studs, nuts, and bolts exposed to vibration

• Automotive repairs: thread locking in engines, gearboxes, and suspension systems

• Hydraulic and pneumatic fittings: preventing leaks and loosening under pressure

• Pipework and flanges: providing a reliable seal in threaded connections

• General engineering: wherever long-lasting thread security is required

Performance & Durability

Once cured, Pratley Pratlok Grade 10-20 creates a permanent, high-strength lock inside the threads. Therefore, it withstands vibration, heat, and the stresses of heavy mechanical loads. In addition, it seals against fluid leaks, offering dual functionality as both a thread locker and a sealing compound. The adhesive is resistant to oils, fuels, coolants, and most common industrial chemicals, which makes it suitable for both automotive and engineering environments.

Why Choose Pratley Pratlok Grade 10-20?

Pratley is a trusted South African brand with a global reputation for adhesives and sealants. The Pratlok range is engineered for professional use and Grade 10-20 fills the crucial space for medium to large fasteners. Moreover, its proven reliability reduces downtime and maintenance costs by ensuring assemblies remain secure for the long term.

With its high-strength anaerobic formulation, this product is the go-to choice for technicians and engineers who need absolute confidence that their bolts and fittings will stay locked, sealed, and protected against vibration or stress.