SW 821 — Low-strength threadlocker
Ideal for vibration-prone applications. Ensures sealing and reliability without compromising maintenance.
General description:
SW 821 is a low-strength anaerobic threadlocker designed to safely lock threaded components that require frequent disassembly.
It is ideal for screws, bolts, nuts and fittings exposed to vibration, thermal excursions and aggressive chemicals.
It withstands oils, fuels, refrigerant fluids and high temperatures up to 150°C.
Used by Faiveley Transport for applications on components subject to regular maintenance, it ensures reliability without compromising removability.
SW 821 is ideal for:
Locking bolts, nuts and screws subject to frequent disassembly or adjustment.
Threaded components requiring periodic maintenance.
Pressure regulators, filters, control valves and similar railway systems.
Composition
Anaerobic methacrylate resin
Color
Purple
Viscosity (25°C)
800 – 1,400 mPa·s
Specific gravity
1.05 g/ml
Detection
UV fluorescence
Flash point
100°C+
Max. thread diameter / Max. joint tolerance
M24 / 0.20 mm
Shelf life
1 year at 25°C in the original containers
Handling time
15 – 30 min
Functional cure
1 – 3 h
Full cure
5 – 10 h
Breakaway torque (ISO 10964)
5 – 8 N·m
Prevailing torque (ISO 10964)
2 – 5 N·m
Shear strength (ISO 10123)
3 – 5 N/mm²
Operating temperature
−55°C ↔ +150°C
Chemical resistance (after 5000 h)
• Engine oil: Good
• Gear oil: Good
• Gasoline: Excellent
• Water/glycol 50%: Good
• Brake fluid: Good
Clean and degrease the surfaces with a suitable product. Apply SW 821 in an amount sufficient to completely fill the joint. Assemble the components and wait for polymerisation.
For disassembly, use conventional tools or heat to 150–250°C to facilitate removal.
Remove residues mechanically and complete cleaning with acetone. Avoid contact with sensitive thermoplastics.
For safety information, refer to the Safety Data Sheet (SDS), available on request.
The product can be ordered in the following packaging:
50 ml bottle – box of 10 pcs
