Loctite 271 High Strength Threadlocker 50ml
Available
Loctite 271 is a one-component, red, high strength anaerobic threadlocker (dimethacrylate ester). It is designed for the permanent locking and sealing of threaded fasteners.
It is a low viscosity grade intended for large bolts and studs up to M25. An activator can be used as a secondary cure, and the product fluoresces under UV light.
Where this product is used
- Permanent locking and sealing of large bolts and studs up to M25
- Brass and steel fasteners, including stainless steel
- Fasteners in contact with petrol, brake fluid, ethanol or 50/50 water/glycol
- Threaded fasteners where removal by local heat is acceptable
Features
- High strength, for permanent locking and sealing
- One component, no mixing
- Red, with fluorescence under UV light
- Low viscosity: 400 to 600 mPa·s
- Anaerobic cure, with an activator (SF 7471 or SF 7649) as a secondary cure
- 17 to 40 N·m breakaway torque on M10 steel (24 h at 22 °C)
- Removable with localised heat to about 250 °C
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Dimethacrylate ester (acrylic, anaerobic) |
| Colour | Red, fluorescent under UV light |
| Strength class | High |
| Viscosity (Brookfield RVT, 25 °C, spindle 1, 10rpm) | 400 to 600 mPa·s (low) |
| Specific gravity (25 °C) | 1.1 |
| Breakaway torque (M10 steel, 24 h at 22 °C, ISO 10964) | 17 to 40 N·m |
| Prevail torque (M10 steel, 24 h at 22 °C, ISO 10964) | 23 to 40 N·m |
| Breakaway torque (3/8 x 16 steel, 24 h at 22 °C) | 16.9 to 34 N·m |
| Breakaway torque (3/8 x 16 steel, 90 min at 22 °C) | 8.5 to 25.4 N·m |
| Thread size | Large bolts and studs up to M25 |
| Approvals | Mil-S-46163A lot requirements (regional approval); ASTM D5363 (North American lots); UL Classification MH8007 (regional approval) |
| Storage | 8 °C to 21 °C, unopened, dry location |
Choosing the right option
For a medium strength grade see Loctite 243 Medium Strength Threadlocker; for medium to high strength see Loctite 262 Acrylic Anaerobic Threadlocker Red 50ml.
For bolts and studs M25 and larger, see Loctite 277 High Strength Threadlocker 50ml and Loctite 272 High Strength - High Temperature Threadlocker 50ml.
See also: Loctite 243 Medium Strength Threadlocker, Loctite 262 Acrylic Anaerobic Threadlocker Red 50ml, Loctite 263 High Strength Threadlocker, Loctite 277 High Strength Threadlocker 50ml.
Using it
An activator (Loctite SF 7471 or SF 7649) can be used as a secondary cure.
To disassemble, apply localised heat to the nut or bolt to about 250 °C and disassemble while hot.
Cure speed depends on the materials, the gap and the temperature.
Hot strength was tested at 0, 100, 120 and 150 °C, and heat ageing at 100, 120 and 150 °C for up to 5,000 h.
Storage and handling
Store unopened in a dry location. Temperature range 8 °C to 21 °C as the optimal range. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.
Limits and safety
Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidisers. Not normally recommended for plastics. Read the safety data sheet before use.
Hot strength was tested at 0, 100, 120 and 150 °C, so check those results against your service temperature.
After 1,000 hours at 22 °C, retained strength is 95% in gasoline, ethanol and acetone, 100% in brake fluid and 85% in 50/50 water/glycol.
In motor oil at 125 °C it retains 75%.
Mil-S-46163A lot requirements (regional approval), ASTM D5363 for North American lots, and UL Classification MH8007 (regional approval) for gasoline, petroleum oils, natural gas to 300 psig, butane and propane, up to 2 in pipe.
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Loctite 271 High Strength Threadlocker 50ml
SKU: A0049841 | Model: 271-50ML-LOC
Loctite 271-50ML-LOC: loctite 271 low viscosity. Size: 50ml. Type: High strength threadlocker.