Loctite 577 Medium Strength Thread Sealant 50ml
Available
Loctite 577 is a one-component, yellow, medium strength anaerobic thread sealant in paste form. It is a dimethacrylate ester designed for the locking and sealing of metal threaded pipes and fittings.
It is particularly suitable for stainless steel without surface activation. It cures in the presence of minor surface contamination from cutting, lubrication and anti-corrosion fluids, and has gap performance to 0.25mm.
Where this product is used
- Locking and sealing metal threaded pipes and fittings
- Stainless steel threads, without surface activation
- Threads with minor contamination from cutting, lubrication or anti-corrosion fluids
- Threads where gap performance to 0.25mm (0.01") is needed
- Gas fittings where the regional approvals in the specification apply
Features
- Medium strength, 33 N·m breakaway on M10 steel
- One component, no mixing
- Yellow paste, high viscosity and thixotropic
- Fluorescence positive under UV light, useful for inspection
- Anaerobic cure, with an activator as secondary cure
- Seals instantly to moderate pressures when properly tightened
- Gap performance to 0.25mm (0.01")
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Dimethacrylate ester |
| Colour | Yellow paste, fluorescence positive under UV light |
| Viscosity (Brookfield RVT, spindle 6, 25 °C, 2.5rpm) | 100,000 mPa·s |
| Viscosity (Brookfield RVT, spindle 6, 25 °C, 20rpm) | 24,500 mPa·s |
| Specific gravity | 1.1 at 25 °C |
| Breakaway torque (M10 steel, 24 h at 22 °C, ISO 10964) | 33 N·m |
| Breakaway torque (M10 stainless steel, 24 h at 22 °C) | 15 N·m |
| Prevail torque (M10 steel) | 2.5 N·m |
| Compressive shear strength (ISO 10123, steel pins and collars) | 5 N/mm² |
| Gap performance | To 0.25mm (0.01") |
| Approvals (AGA, GASTEC and NSF marked regional by Henkel) | Australian Gas Association certificate 4787 (Class III, 2000 kPa, working temperature -10 to 135 °C); EN 751-1 class H compound with DVGW certification; GASTEC QA AR-214, Hydrogen Certified Adhesive; NSF category P1 (no possibility of food contact, in and around food processing areas) |
| Storage | 8 °C to 21 °C, unopened, dry |
Choosing the right option
Loctite 577 is the medium strength paste. For a medium strength liquid see Loctite 542 Medium Strength Thread Sealant. For low strength see Loctite 567 PST Low Strength Thread Sealant or Loctite 565 PST Thread Sealant 50ml.
See also: Loctite 542 Medium Strength Thread Sealant, Loctite 567 PST Low Strength Thread Sealant, Loctite 565 PST Thread Sealant 50ml, Loctite 569 Low Strength Thread Sealant 50ml.
| Option | Part number | SKU |
|---|---|---|
| 50ml | 577-50ML-LOC | A0049887 |
| 250ml | 577-250ML-LOC | A0049864 |
Using it
Apply a 360 degree bead to the threads of the male fitting, leaving the first thread free. Activator SF 7471 or SF 7649 is the secondary cure.
Fittings seal instantly to moderate pressures. For maximum pressure and solvent resistance, allow a minimum of 24 hours to cure.
Storage and handling
Store unopened in a dry location. Optimal storage is between 8 °C and 21 °C. 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 oxidising materials. Plastics can stress crack.
The approval is regional, so confirm it for your application.
The working temperature in the AGA approval is -10 to 135 °C, and cold strength was tested to -75 °C.
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50ml
Model Number: 577-50ML-LOC
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250ml
Model Number: 577-250ML-LOC
