Expand-A-Seal is a unique microencapsulated expanding thread sealant which is pre-applied by ND to your fasteners and arrives dry to the touch and ready for assembly. Upon installation Expand-A-Seal increases in volume 20 to 50%, penetrating gaps in fastener threads typically left unfilled by conventional thread sealants. When fully cured it forms a high pressure seal against gas and fluid.

How it Works

Expand-A-Seal contain a microencapsulated epoxy resin and expanding compounds suspended in a hardener. The forces of engagement crush the microscopic capsules of epoxy resin and expansion agent, mixing the separate reactant components, and initiating a chemical reaction. As the reaction is taking place, the material expands, filling the fastener thread gaps while hardening.


Problem Solver

Many threadsealants fail when used in less than optimal conditions, such as misfit parts or threadformed screws. Because of its expansion properties, Expand-A-Seal can overcome these limitations.

High Pressure Seal

Expand-A-Seal has been shown to have some of the highest sealing pressures of all our pre-applied theadsealants with burst pressure in excess of 10,000 psi under challenging conditions.

Chemical Resistant

A cross-linked molecular structure makes it one of the most resistant types of adhesives. Oil, gasoline, salt spray, acids, solvents, and water have virtually no effect on parts when introduced after final cure.

Surface Insensitive

Expand-A-Seal is compatible with most fastener sizes, configurations, materials and finishes. Its epoxy formulation ensures that a strong reliable lock and seal are formed.

Secure Lock

Once cured, a low strength lock is formed which helps prevent loosening under vibration or reversal of stress and greatly reduces the need to retighten fasteners.

Long Shelf Life

Expand-A-Seal has an on-part life of 1 1/2 years and will remain inert until a cure is activated by engagement with a mating thread.


  • Saves Time: ND’s Expand-A-Seal Pre-Applied service utilizes custom build in-house equipment to coat your fasteners at extremely high rates. In addition, our rapid turn around time and fast customer service lead to significant time savings.
  • Saves Money: The bulk pre-application of Expand-A-Seal to fasteners is less expensive than hand applying bottled thread sealing compounds at the point of assembly. It also eliminates the need for costly lock washers, cotter pins or castellated nuts.
  • Quality Control: The Expand-A-Seal Pre-Applied process is strictly controlled by ND to meet and reduce variation between parts. Fasteners are coated to specification, insuring consistent performance from fastener to fastener and lot to lot.


  • Breakaway Torque: M-10 Phosphate oil bolt. Zinc Test Nut @24 hr: 13 Nm
  • Breakaway Torque: M-10 Zinc plate bolt. Zinc Test Nut @24hr: 12 Nm
  • Fixture time: 60 minutes @ 72°F
  • Full cure time: 24 hours @ 72°F
  • Expand-A-Seal is normally applied one to three threads back from the end of a fastener to assure ease of starting.
  • It is recommended that Expand-A-Seal fasteners are not reused.
  • *Shelf life of un-activated part is 18 months when stored in a dry, cool environment.

Expand-A-Seal Competes With

  • N/A – Expand-A-Seal is a ND Industries exclusive product.


Marine Ride Plates, Head Bolts, Engine Plugs, Pipe Fittings, Engine Bolts

Compatible Fasteners

External Threads:Internal Threads:Rivets:
Banjo Bolts, Hex Bolts, Flange Bolts, Wheel Bolts, Machine Screws, Cap Screws, Wood Screws, Sheet Metal Screws, Self Drilling Screws, Shoulder Bolts, Fully Threaded Studs, Double Ended Studs, Singled Ended Studs, Press-In Captive Studs, Carriage Bolts, Lag Bolts, Socket Screws, Set Screws, Eye Bolts, Eye Lags, J-Bolts, U-Bolts, Elevator Bolts, Hangar Bolts, Perforated Base Studs, Through Hole Weld Studs.Flange Nuts, Hex Body Clinch Nuts, Prevailing Torque Nuts, Floating Nuts, Hollow Bolts, Insert Nuts, Lock Nuts, Weld Nuts, Barrel Nuts, Chicago Bolts, Jam Nuts, Wing Nuts, Square Nuts, Self-Locating Projection Weld Nuts (WN/WNS), Spot Weld Nuts, Projection Weld Nuts, Bridge Spot Weld Nuts, Tab Spot Weld Nuts, Square Projection Weld Nuts, Flange Weld Projection Nuts, Stamped Flange Weld Nuts, Spot Weld Cage Nuts.N/A

Don’t see your parts on this list? We process thousands of different types of fasteners and depending on the quantity will gladly look at whether we can accommodate yours as well.

Technical Data

ProcessColorPrimary UsePrevailing On TorqueBreakaway TorqueTemp MinTemp MaxLubricityPressure Resistance**
Expand-A-SealPurpleHigh Pressure Seal, Medium Strength LockExceeds IFI 125 & IFI 525-65°F (-54°C)300°F (150°C)Medium> 115 PSI

**Coated parts assembled into aluminum block and submersed in the test fluid and heated for 30 days then tested at temperature for sealing and tested for breakaway torque when cooled. Assembled parts tested at 793 kPa (115 PSI).

Safety, Technical & Product Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Process Data Sheet
Expand-A-Seal®ES0106Expand-A-Seal - TDS (Applied)Expand-A-Seal - PDS
Increase product quality while saving time and money with Pre-Applied adhesives and sealants.