Loctite 561 Thread Sealant Stick

USD 49.00

Semi-solid anaerobic thread sealant stick with PTFE for metal pipes up to M80/R3″. Offers instant 100 psi seal, curing to 10,000 psi. NSF/ANSI 61 certified.

SKU Loctite-561-19g Category
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Loctite 561 Thread Sealant Stick (19g)

Model Identifier 561
Official Part Number 463973
GTIN Standard 079340371279

Technical Overview

Semi-solid anaerobic thread sealant stick with PTFE for metal pipes up to M80/R3". Offers instant 100 psi seal, curing to 10,000 psi. NSF/ANSI 61 certified.

Key Features

  • Convenient semi-solid stick format eliminates drips, leaks, and spills, ensuring clean application
  • Suitable for all tapered metal pipes and fittings up to M80/R3" (3 inches) thread diameter
  • Provides immediate low-pressure sealing up to 100 psi upon assembly
  • Achieves high-pressure sealing up to 10,000 psi once fully cured (24 hours)
  • Low disassembly strength allows easy removal with standard hand tools (breakaway torque of 6 N·m on M10 steel)
  • Tested and certified to NSF/ANSI Standard 61 for commercial and residential potable water systems up to 82°C
  • Fluoresces under UV light for easy coverage inspection and quality control
  • Withstands continuous operating temperatures from -55°C to 150°C (-65°F to 300°F)

Anaerobic semi-solid stick formula providing instant low-pressure sealing up to 100 psi and a high-pressure seal up to 10,000 psi when fully cured, with NSF/ANSI 61 certification.

Technical Specification Matrix

ParameterValue
TechnologyAcrylic / Methacrylate ester
Cure TypeAnaerobic
Physical FormSemi-solid stick / Wax-like
ColorWhite to Off-white
Specific Gravity @ 25°C1.14
Maximum Thread SizeM80 / R3" (3 inches)
Operating Temperature Range-55°C to +150°C (-65°F to +300°F)
Breakaway Torque (Steel M10)6.0 N·m
Instant Low-Pressure Seal100 psi
Maximum Pressure Resistance10,000 psi
Agency Approvals / CertificationsNSF/ANSI Standard 61
FluorescencePositive under UV light
Full Cure Time24 hours
Physical Weight (kg)0.04
Dimensions L x W x H (cm)9.65 x 2.54 x 2.54

Industrial Applications

1. Overhead Industrial Fluid Processing Repairs

In chemical processing plants and wastewater facilities, retrofitting or repairing overhead piping networks can lead to messy drips when using traditional liquid or paste sealants. Using the non-drip, semi-solid stick format, maintenance technicians can cleanly apply the compound to threaded joints overhead without the risk of gravity-induced runs, keeping work areas clean and safe.

Problem Solved

Eliminates messy dripping and environmental contamination during overhead threaded pipe assembly and repair.

overhead applicationnon-dripsemi-solidtapered threadsspill prevention

2. High-Pressure Hydraulic Feed Line Sealing

Hydraulic systems operating under extreme pressures up to 10,000 psi require robust sealing at connection interfaces to prevent micro-leakages under continuous shock and vibration. Fully cured, this compound fills the microscopic voids between close-fitting metal threads, creating a high-pressure barrier up to 10,000 psi that dampens vibration and prevents self-loosening.

Problem Solved

Prevents high-pressure fluid leakage and vibration-induced loosening in hydraulic systems up to 10,000 psi.

high pressure sealingvibration resistance10,000 psiclose-fitting metal surfacesanaerobic cure

3. Potable Water System Pipe Fitting Sealing

In commercial and residential water distribution networks, any thread sealant used must comply with strict safety certifications to prevent water contamination. This compound's NSF/ANSI Standard 61 certification ensures it is safe for potable water systems up to 82°C. Additionally, its low breakaway torque (6 N·m) allows maintenance teams to quickly swap out water meters, valves, and fittings during routine service without damaging pipe threads.

Problem Solved

Meets strict safety standards for drinking water while enabling easy, non-destructive maintenance disassembly of water pipes.

NSF/ANSI Standard 61potable watereasy disassemblybreakaway torquepotable water systems
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