LOCTITE® 577 High-Performance Thread Sealant | 50ml | 577-50 | Metal Pipe & Fitting Sealant

Medium-Strength Anaerobic Thread Sealant for Metal Pipes, Fittings and Industrial Fluid Systems

Supply Solutions Group supplies LOCTITE® 577 Thread Sealant – 50ml (577-50) to organisations operating across manufacturing, engineering, mining, automotive, fluid processing, pump maintenance, industrial maintenance and mechanical workplaces throughout Australia.

LOCTITE 577 is a professional general-purpose thread sealant developed for the locking and sealing of threaded metal pipes and fittings.

Manufactured by Henkel, LOCTITE 577 uses anaerobic curing technology.

The sealant cures when confined in the absence of air between close-fitting metal surfaces, filling the spaces between mating threads to create a reliable seal while also helping lock the threaded connection.

LOCTITE 577 is a:

• One-component product

• Medium-strength thread sealant

• Thixotropic formulation

• Anaerobic curing sealant

• General-purpose metal pipe sealant

The product is designed for straight-to-straight and straight-to-taper threaded fittings.

Its thixotropic consistency helps prevent the sealant from migrating away from the application area after dispensing.

LOCTITE 577 provides an instant low-pressure seal after assembly, helping prevent leakage while the anaerobic product continues curing.

Once cured, it helps prevent both loosening and leakage from appropriate threaded metal joints.

A significant advantage of LOCTITE 577 is its ability to completely fill the spaces between threaded components.

Unlike conventional thread tape, the liquid sealant conforms to the threaded connection and cures within the joint.

Henkel specifies gap performance up to:

0.25mm / 0.01"

The product is effective on both active and inactive metals.

It is particularly useful on stainless steel and can cure on stainless-steel threaded connections without requiring surface activation under normal conditions.

LOCTITE 577 also provides useful contamination tolerance.

Henkel states that the product can cure in the presence of minor surface contamination from materials such as:

• Cutting fluids

• Lubricating oils

• Anti-corrosion fluids

• Protective fluids

• Certain cleaners containing surfactants and corrosion inhibitors

Proper cleaning and surface preparation are still recommended for optimum performance.

LOCTITE 577 is designed not to:

• Creep

• Shrink

• Shred

This makes it a useful alternative to traditional thread-sealing materials in suitable industrial piping and fluid-processing applications.

Typical uses include:

• Threaded metal pipes

• Pipe fittings

• Pumps

• Fluid-processing equipment

• Industrial machinery

• Maintenance and repair

• Metal threaded connections

The medium-strength formulation allows suitable threaded joints to be disassembled using conventional hand tools for servicing when required.

The convenient 50ml pack provides a practical quantity for workshops, maintenance departments, engineering teams, mine sites and manufacturing facilities.

This listing contains 1 × 50ml LOCTITE 577 Thread Sealant – 577-50.

As an Indigenous-owned industrial supplier and procurement partner, Supply Solutions Group provides LOCTITE thread sealants, threadlockers, retaining compounds, flange sealants, adhesives, anti-seize products and industrial maintenance consumables backed by responsive customer service, procurement support and Australia-wide business supply capability.

Product Type

• Product Type: Thread Sealant

• Brand: LOCTITE®

• Manufacturer: Henkel

• Product: LOCTITE 577

• Product Reference: 577-50

• Current Australian 50ml IDH: 2779092

• Pack Size: 50ml

• Application: Metal Pipes & Fittings

• Technology: Acrylate

• Cure Type: Anaerobic

• Components: One Component

• Strength: Medium

• Consistency: Thixotropic

• Maximum Gap Performance: 0.25mm

• Immediate Low-Pressure Seal: Yes

• Oil / Contamination Tolerant: Yes

• Suitable for Active Metals: Yes

• Suitable for Inactive Metals: Yes

• Suitable for Stainless Steel: Yes

• Primary Application: Pipe & Thread Sealing

Key Features

• Genuine LOCTITE® industrial thread sealant

• Manufactured by Henkel

• LOCTITE 577

• 50ml pack

• General-purpose thread sealant

• Designed for metal pipes and fittings

• One-component formulation

• No mixing required

• Anaerobic cure technology

• Medium strength

• Thixotropic consistency

• Helps prevent migration after application

• Seals threaded connections

• Locks threaded connections

• Straight-to-straight thread compatibility

• Straight-to-taper thread compatibility

• Gap performance up to 0.25mm

• Provides instant low-pressure sealing

• Effective on active metals

• Effective on inactive metals

• Suitable for stainless steel

• High contamination tolerance

• Tolerates minor oil contamination

• Does not creep

• Does not shrink

• Does not shred

• Helps prevent leakage

• Helps prevent loosening

• Suitable for industrial piping

• Suitable for fluid processing

• Suitable for pump repair

• Suitable for manufacturing

• Suitable for industrial maintenance

• Serviceable medium-strength formulation

Technical Specifications

Specification Details
Brand	LOCTITE®
Manufacturer	Henkel
Product	577
Product Type	General-Purpose Thread Sealant
Product Reference	577-50
Current Australian 50ml IDH	2779092
Pack Size	50ml
Technology	Acrylate
Cure Type	Anaerobic
Components	One Component
Strength	Medium
Rheology	Thixotropic
Maximum Gap Performance	0.25mm / 0.01"
Immediate Low-Pressure Seal	Yes
Thread Compatibility	Straight-to-Straight
Thread Compatibility	Straight-to-Taper
Recommended Material	Metal
Active Metal Compatibility	Yes
Inactive Metal Compatibility	Yes
Stainless Steel Compatibility	Yes
Minor Surface Contamination Tolerance	Yes
Creep	No
Shrink	No
Shred	No
Primary Applications	Pipe Sealing & Thread Sealing

Typical Applications

• Metal pipe threads

• Metal pipe fittings

• Threaded connections

• Straight threaded fittings

• Tapered threaded fittings

• Pumps

• Pump repair

• Fluid-processing equipment

• Industrial piping

• Plant maintenance

• Machinery maintenance

• Mechanical assemblies

• Manufacturing equipment

• Process equipment

• Workshop repairs

• Industrial servicing

• Maintenance and repair operations

Suitable Industries

• Industrial manufacturing

• Fluid processing

• Mining and resources

• Engineering

• Pump repair

• Automotive

• Industrial maintenance

• Mechanical services

• Oil and gas support

• Power generation support

• Utilities

• Infrastructure

• Heavy equipment

• Plant maintenance

• Equipment manufacturing

• Remanufacturing

• Mechanical workshops

• Trades and contracting

Why Choose LOCTITE® 577 Thread Sealant?

LOCTITE 577 provides a reliable alternative to traditional thread-sealing methods for suitable metal pipe connections.

Threaded fittings contain microscopic spaces between the male and female threads.

If these spaces are not effectively sealed, liquids or gases can travel through the threaded path and create leaks.

LOCTITE 577 flows into these spaces during assembly.

Once confined between the metal threads, the product cures anaerobically and creates a durable seal throughout the threaded interface.

This provides both:

Sealing + Locking

in a single application.

Anaerobic Cure Technology

LOCTITE 577 uses anaerobic cure technology.

The material remains uncured while exposed to air.

Curing begins when the product is:

• Confined between close-fitting surfaces

• In contact with metal

• Deprived of oxygen

This curing mechanism makes anaerobic sealants particularly effective for threaded metal connections.

Medium Strength

LOCTITE 577 is classified as a:

Medium-Strength Thread Sealant

The cured product helps secure the threaded connection while still allowing appropriate disassembly using conventional hand tools for maintenance and servicing.

Actual disassembly requirements depend on:

• Thread diameter

• Thread geometry

• Material

• Cure conditions

• Service environment

• Assembly torque

Instant Low-Pressure Seal

Henkel specifies that LOCTITE 577 provides an:

Instant Low-Pressure Seal

This means the assembled connection can resist appropriate low pressure before the product has achieved its final cure.

Full service conditions should still account for the required curing period and the equipment manufacturer’s procedures.

Gap Performance up to 0.25mm

LOCTITE 577 offers gap performance up to approximately:

0.25mm / 0.01"

The liquid sealant fills the spaces between mating threads to help eliminate potential leak paths.

Straight-to-Straight Threads

LOCTITE 577 is suitable for:

Straight-to-Straight Threaded Fittings

This makes it useful across a wide variety of industrial pipe and equipment assemblies.

Straight-to-Taper Threads

The product is also designed for:

Straight-to-Taper Threaded Fittings

Always ensure the thread form and connection design are suitable for the application.

Suitable for Stainless Steel

LOCTITE 577 is particularly effective on:

Stainless Steel

Henkel states that it can be used on stainless-steel connections without the need for surface activation under normal application conditions.

This is useful because stainless steel is considered a relatively passive metal and some anaerobic products may cure more slowly on passive substrates.

Active & Inactive Metal Performance

Henkel identifies LOCTITE 577 as effective on both:

• Active metals

• Inactive metals

This provides flexibility across industrial facilities using different pipe and fitting materials.

Material compatibility should still be confirmed for the exact application.

Contamination Tolerance

LOCTITE 577 offers useful tolerance to minor surface contamination.

Henkel identifies compatibility with residual contamination from materials including:

• Cutting fluids

• Lubricating oils

• Anti-corrosion fluids

• Protective fluids

• Certain industrial cleaners

This does not eliminate the need for good surface preparation.

Clean components generally provide the most predictable bonding and sealing performance.

Does Not Creep, Shrink or Shred

Henkel specifies that LOCTITE 577:

Does not creep, shrink or shred.

This is particularly valuable in fluid systems.

Conventional sealing materials can potentially move, fragment or become displaced during assembly.

An anaerobic liquid thread sealant cures within the threaded interface, creating a seal that conforms directly to the joint.

Helps Prevent Leakage

Threaded pipe leakage can cause:

• Fluid loss

• Pressure loss

• Equipment contamination

• Maintenance requirements

• Production downtime

• Workplace housekeeping issues

LOCTITE 577 fills the threaded interface to help prevent leakage in properly designed and assembled systems.

Helps Prevent Loosening

Once cured, the product also helps prevent threaded connections from loosening due to appropriate levels of:

• Shock

• Vibration

• Equipment operation

This combination of sealing and locking performance is one of the primary advantages of anaerobic thread sealants.

Pump Repair Applications

Henkel identifies pump repair as a relevant application area for LOCTITE 577.

Typical suitable threaded connections may occur in:

• Pump assemblies

• Process equipment

• Maintenance systems

• Fluid-handling equipment

Application suitability should always be determined from the equipment design and service conditions.

Fluid Processing

LOCTITE 577 is also positioned for fluid-processing applications.

Reliable thread sealing is important in fluid systems because even small leak paths can result in:

• Loss of pressure

• Fluid leakage

• Reduced system reliability

• Increased maintenance

The product fills threaded spaces rather than relying solely on mechanical interference between the threads.

Application Guidance

For appropriate application:

1. Ensure the fitting is suitable for anaerobic thread sealant.

2. Clean mating threads as required.

3. Remove excessive contamination.

4. Apply LOCTITE 577 according to Henkel instructions.

5. Distribute the sealant appropriately around the male thread.

6. Assemble the fitting.

7. Tighten according to the equipment manufacturer’s requirements.

8. Allow adequate cure before exposure to demanding operating conditions.

Always refer to the current Henkel Technical Data Sheet for detailed instructions.

Surface Preparation

Although LOCTITE 577 tolerates minor surface contamination, appropriate cleaning is recommended for optimum performance.

Before application:

• Remove dirt

• Remove loose corrosion

• Remove excessive oil

• Remove old thread tape

• Remove previous sealing material

• Check threads for damage

Clean, serviceable threads help provide consistent assembly and sealing.

Compared with Thread Tape

Liquid anaerobic thread sealants operate differently from conventional PTFE thread tape.

LOCTITE 577:

• Fills spaces between threads

• Cures inside the joint

• Does not shred

• Helps lock the fitting

• Does not shrink

• Provides consistent coverage when correctly applied

The most appropriate sealing method depends on the system design, applicable standards and service requirements.

Compared with Conventional Thread Paste

Conventional pipe-thread pastes may rely on solvent evaporation or drying.

Anaerobic LOCTITE thread sealants instead cure when confined between metal surfaces.

This allows the cured material to conform closely to the threaded interface without relying on conventional drying.

Disassembly

Because LOCTITE 577 is a medium-strength product, appropriately assembled connections can generally be dismantled using normal hand tools for maintenance.

Where disassembly is difficult, follow Henkel’s current technical guidance rather than applying uncontrolled force or heat.

Storage

For best product condition:

• Keep in the original container

• Keep the container closed when not in use

• Store according to the temperature range specified on the current product label or Technical Data Sheet

• Protect from excessive heat

• Protect from contamination

• Observe the expiry date

• Do not return dispensed material to the original container

Important Application Considerations

LOCTITE 577 is intended primarily for:

Threaded metal pipes and fittings

Do not automatically assume suitability for:

• Plastic threads

• Non-metallic fittings

• Oxygen systems

• Strong oxidising media

• Every potable-water installation

• Every gas system

• Every high-temperature steam application

Application requirements, approvals, operating fluids, temperature and pressure must be checked against the current Henkel technical documentation and relevant system standards.

For fine-thread hydraulic and pneumatic fittings, a product such as LOCTITE 545 may be more appropriate depending on the application.

For specialised high-temperature steam systems, Henkel offers dedicated products such as LOCTITE 5770.

Important Safety Information

LOCTITE 577 is an industrial chemical product.

Before use:

• Read the current product label

• Read the current Safety Data Sheet

• Follow workplace chemical-handling procedures

• Avoid eye contact

• Avoid unnecessary skin contact

• Use suitable PPE identified by the risk assessment

• Maintain appropriate workplace ventilation

• Wash hands after use

• Store correctly

• Dispose of waste according to applicable requirements

Why Buy from Supply Solutions Group?

Supply Solutions Group is an Indigenous-owned Australian supplier of industrial adhesives, thread sealants, threadlockers, retaining compounds, gasket sealants, lubricants and maintenance consumables, providing LOCTITE products backed by procurement support and Australia-wide business supply capability.

Benefits of Partnering with Supply Solutions Group

• Australia-wide business supply capability

• Indigenous-owned and operated business

• Genuine LOCTITE product supply

• Henkel industrial products

• Thread sealants

• Pipe sealants

• Threadlockers

• Retaining compounds

• Flange sealants

• Gasket products

• Engineering adhesives

• Industrial lubricants

• Anti-seize products

• Pump-maintenance consumables

• Fluid-processing products

• Mining maintenance products

• Manufacturing consumables

• Mechanical workshop products

• Procurement support services

• Trade account options

• Bulk purchasing solutions

• Product sourcing assistance

• Responsive customer service

• Ongoing commercial supply arrangements

Frequently Asked Questions

What is LOCTITE 577?
LOCTITE 577 is a one-component, medium-strength anaerobic thread sealant for locking and sealing threaded metal pipes and fittings.

How much product is supplied?
This listing contains 50ml.

What is the product reference?
This listing uses the reference 577-50.

What is the current Australian Henkel IDH for the 50ml product?
Henkel’s current Australian product documentation identifies IDH 2779092 for the 50ml Australian configuration.

Is LOCTITE 577 a high-pressure thread sealant?
LOCTITE 577 is designed for reliable sealing of threaded metal pipe and fitting connections and provides an immediate low-pressure seal during cure. Final pressure suitability depends on the pipe system, joint design, cure and operating conditions and should be checked against current Henkel technical data.

Is LOCTITE 577 medium strength?
Yes. Henkel classifies it as a medium-strength thread sealant.

Does LOCTITE 577 require mixing?
No. It is a one-component product.

How does LOCTITE 577 cure?
It cures anaerobically when confined between close-fitting metal surfaces in the absence of air.

What type of threads is LOCTITE 577 designed for?
Henkel specifies straight-to-straight and straight-to-taper threaded fittings.

What gap can LOCTITE 577 fill?
Henkel specifies gap performance up to approximately 0.25mm / 0.01".

Does it provide an immediate seal?
Yes. Henkel specifies an instant low-pressure seal.

Can LOCTITE 577 be used on stainless steel?
Yes. Stainless steel is a key application material for LOCTITE 577.

Does stainless steel require an activator?
Henkel states that LOCTITE 577 is suitable for stainless steel without requiring surface activation under normal conditions.

Does it work on active and inactive metals?
Yes. Henkel describes the product as effective on both active and inactive metals.

Does it tolerate oil contamination?
LOCTITE 577 tolerates minor surface contamination from certain cutting, lubricating, anti-corrosion and protective fluids. Proper cleaning is still recommended.

Does LOCTITE 577 shrink?
Henkel specifies that it does not creep, shrink or shred.

Does it help stop fittings loosening?
Yes. Once cured, it seals and locks the threaded connection and helps prevent loosening and leakage.

Is LOCTITE 577 suitable for pumps?
Yes. Henkel identifies pump repair as a relevant application area.

Is it suitable for fluid-processing equipment?
Yes. Fluid processing is a manufacturer-identified application segment.

Can it replace PTFE thread tape?
It can provide an alternative sealing method for suitable metal threaded connections. The correct sealing technology should always be selected according to the system design and applicable standards.

Can LOCTITE 577 be used on plastic fittings?
LOCTITE 577 is intended for metal pipes and fittings. Use a product specifically approved for plastic threads where required.

Is LOCTITE 577 the same as LOCTITE 5770?
No. LOCTITE 577 is a general-purpose metal thread sealant. LOCTITE 5770 is a specialised high-temperature product intended for demanding industrial applications such as steam piping.

Is LOCTITE 577 the same as LOCTITE 542?
No. LOCTITE 542 is particularly suited to fine-thread hydraulic, pneumatic and general fittings, while LOCTITE 577 is a general-purpose pipe-thread sealant.

Can the joint be disassembled later?
Yes. Its medium-strength formulation allows suitable connections to be serviced using conventional hand tools.

Should the threads be cleaned first?
Yes. Although the product tolerates minor contamination, appropriate cleaning provides more predictable sealing and curing performance.

Can Supply Solutions Group provide other LOCTITE thread sealants?
Yes. Supply Solutions Group can assist with LOCTITE 542, 545, 55, 567, 569, 577, 5770 and other thread-sealing products, subject to availability.

Can Supply Solutions Group provide bulk quantities?
Yes. Bulk and ongoing procurement arrangements are available for manufacturers, mine sites, engineering companies, pump-service businesses, mechanical workshops and industrial maintenance operations.