LOCTITE 571

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

LOCTITE 571

Main features

  • Medium-Viscosity Tapered-Thread Sealing
  • Anaerobic One-Part Retention
  • Fluid-Exposure Strength Retention

Product Description

LOCTITE 571 is a brown, medium-viscosity one-component anaerobic thread sealant for locking and sealing metal tapered threads and fittings. The methacrylate liquid cures in confined metal joints after air is excluded, with activator-supported cure available where the application process requires it. Its viscosity range supports controlled coverage without the very free flow of lower-viscosity grades. The cured sealant has medium-strength retention and measured prevailing-torque performance. Properly tightened fittings can seal immediately to moderate pressure, while a 24-hour cure supports maximum pressure and solvent resistance.

Key features

  • Controlled tapered-thread coverage: A 1,000 to 10,000 mPa s viscosity supports application to metal tapered threads and fittings.
  • Anaerobic one-part cure: The material cures in confined metal joints without component mixing.
  • Fluid-exposure strength retention: Tested joints retained initial strength after specified 720-hour fluid exposures at 87 deg C.

Applications / Suitable for

  • Locking metal tapered threads
  • Sealing metal pipe fittings
  • Assemblies requiring medium-strength service retention
Product Family

LOCTITE 571

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Chemistry Type
Methacrylate ester
Color
The color
Brown liquid
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
One component
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Thermal Properties
Linear thermal expansion
0.1×10^-6 K -1
Specific Heat Capacity
Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to the size of the system being examined.
0.3 J/(g⋅°C)
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
0.1 W/m.K
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
1,000 to 10,000 mPa.s

Additional Information

Technical properties

As-supplied / before-processing properties

Typical values and characteristics for the product before cure, application, or assembly.

PropertyValueUnitMethod / condition
AppearanceBrown liquid-As supplied
Chemical typeMethacrylate ester-One-component material
Specific gravity1.1-25 deg C
Viscosity1,000 to 10,000mPa sBrookfield RVF, spindle 3, 20 rpm, 25 deg C
Cure mechanismAnaerobic-Confined between close-fitting metal surfaces
Secondary cure supportActivator-When specified for the application
Technical properties

After-processing / final-state properties

Typical values for the cured, bonded, treated, or in-service product under the listed conditions.

PropertyValueUnitMethod / condition
Prevailing torque after 6 h0.6 to 2.8N m3/8 x 24 grade 2 steel fasteners, 22 deg C
Prevailing torque after 24 h1.1 to 2.8N m3/8 x 24 grade 2 steel fasteners, 22 deg C
Strength retention in motor oil100% of initial720 h at 87 deg C
Strength retention in unleaded gasoline100% of initial720 h at 87 deg C
Strength retention in phosphate ester100% of initial720 h at 87 deg C
Strength retention in acetone100% of initial720 h at 87 deg C
Strength retention in distilled water100% of initial720 h at 87 deg C

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