3M™ Thread Sealants

ATTENTION: 3M has announced that Thread Sealant 4291 will be discontinued at the end of 2023. We recommend ND Industries ST-3 as a comparable offset.

Click Here to learn more about the performance and specifications associated with each ST-3 formulation

Authorized Applicator

ND Industries is an Authorized Applicator of 3M™ Fastener Adhesives and 3M™ Thread Sealants. 3M™ is a trademark of 3M Corporation, USA.

Overview

3M™ Thread Sealant 4291 is a water-based product designed to be pre-applied to threaded fasteners, providing excellent resistance to automotive fluids and withstanding high temperatures and pressures. Typical applications are threaded fasteners for the engine compartment.

How it Works

3M™ Thread Sealant 4291 is dry to the touch on arrival and ready for immediate assembly. During fastener installation, 4291 acts as a partial lubricant, reducing torque tension variation and preventing the galling of metals. 4291 does not harden or cure, allowing fasteners to be adjusted, removed, and replaced, if needed, during the life of the part.

Document Links

SDSSDS TDSTDS Product Data SheetProduct Data Sheet Request a Quote or SampleRequest a Quote or Sample

Features

High Pressure Seal

3M Fastener Sealant 4291 creates an instant seal on both straight and tapered threads.

Offers Multiple Reuses

3M Fastener Sealant 4291 is a non hardening formula with lubricating properties which makes it easy to adjust, remove, and reuse.

Resists Vibration

3M Fastener Sealant 4291 helps to lock threads by resisting vibration and thermal shock.

Environmentally Friendly

3M Fastener Sealant 4291 is a water based formula that contains no harmful Volatile Organic Compounds (VOC).

Chemical Resistant

3M Fastener Sealant 4291 exhibits excellent resistance to automotive fluids such as gasoline, motor oil, transmission fluid and anti-freeze.

Versatile

3M Fastener Sealant 4291 can be used on both pipe and straight threaded fasteners.

Benefits

Saves Time: Fasteners coated with 4291 thread sealants can be automatically fed through standard feeding devices – speeding up your process and improving productivity.
Saves Money: The bulk pre-application of 4291 products to fasteners is less expensive than hand applying bottled thread sealing compounds or tapes at the point of assembly.
Quality Control: Pre-Applied 4291 fasteners are coated to specification, ensuring consistent performance, unlike the variation from hand applying bottled products.
Reliability: Under most operating conditions, 4291 products are unaffected by vibration or reversal of stress and greatly reduces the need to re-tighten fasteners.

Notes

3M Thread Sealant 4291 is normally applied one to three threads back from the end of a fastener to assure ease of starting.
Shelf life of one year from date of adhesive application, but can be as long as four years, depending on the storage conditions. Fasteners which are more than one year from the date of adhesive application should be checked for performance prior to use.
As with all our Pre-Applied products, ND Industries can apply 4291 to your fasteners at any one of our regional service centers, or we can supply you with completed pre-applied fasteners.

3M Thread Sealant 4291 Competes With

ND Industries ST-3-W
ND Industries ST-3-L3

Applications

Applications
Pipe Plugs, Engine Applications, Head Gasket Application, Under Head Sealant for Torque Tension control, Automotive Hose Fittings, Cooling System, A/C System

Technical Data

Product	Competes With	Chemical Resistance	Fluid Tightness	High Pressure Resistance
3M™ Thread Sealant 4291	ND ST-3-W, ND ST-3-L3	toluene (room temperature) No leaks gasoline (room temperature) No leaks motor oil (300°F/149°C) No leaks transmission fluid (300°F/149°C) No leaks anti-freeze (266°F/130°C) No leaks brake fluid (300°F/149°C) No leaks diesel fuel #2 (room temperature) No leaks hot water (200°F/93°C) No leaks	gasoline (room temperature) 150 psi / no leaks motor oil (300°F/149°C) 150 psi / no leaks transmission fluid (300°F/149°C) 150 psi / no leaks anti-freeze (266°F/130°C) 150 psi / no leaks hot water (200°F/93°C) 150 psi / no leaks	1200+ psi (84+ kg/cm2) No leaks

Safety, Technical & Product Data Sheets

Process Name	Material	Safety Data Sheet (Applied)	Technical Data Sheet (Applied)	Product Data Sheet
3M™ Thread Sealant	4291	4291 SDS	4291 - TDS (Applied)	4291

Increase product quality while saving time and money with Pre-Applied adhesives and sealants.