ST-3® Thread Sealant

Overview

ST-3 series products are resilient thread sealants for straight or tapered threaded fasteners. A widely-used, automotive industry approved product, ST-3 series materials immediately form a custom-fit, elastic gasket right in the threads that prevents the passage of most fuels and chemicals, and helps keep joints tight, even under severe vibration.

How it Works

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

Features

Exceptional Sealing Power

ST-3 creates an instant seal of over 2000 psi on both straight and tapered threads.

Offers Multiple Reuses

ST-3 is a non hardening formula with lubricating properties which makes it easy to adjust, remove, and reuse.

Resists Vibration

Though ST-3 is used to seal fasteners, it also helps to lock threads by resisting vibration. It is highly resistant to thermal shock and remains elastic through a wide range of temperatures.

Environmentally Friendly

ST-3 is non-hazardous and non-flammable, and will not migrate into fluid systems like paste and tape sealants.

Chemical Resistant

ST-3 protects against corrosion from brine, chlorine, acids, and alkalis. It effectively resists natural gas, butane, propane, motor fluids, and other chemicals.

Corrosion Resistance

ST-3 inhibits corrosion between mating fasteners which prevents seizing and allows for easy removal.

Benefits

  • Saves Time: Fasteners coated with ST-3 thread sealants can be automatically fed through standard feeding devices – speeding up your process and improving productivity.
  • Saves Money: The bulk pre-application of ST-3 products to fasteners is less expensive than hand applying bottled thread sealing compounds or tapes at the point of assembly.
  • Quality Control: Pre-Applied ST-3 fasteners are coated to specification, ensuring consistent performance, unlike the variation from hand applying bottled products.
  • Reliability: Under most operating conditions, ST-3 products are unaffected by vibration or reversal of stress and greatly reduces the need to re-tighten fasteners.
  • Increased Margins: Add value to your fasteners without adding to inventory by supply customers with self-sealing fasteners.
  • Easy to use: Works on a wide range of material finishes

Notes

  • ST-3 materials are normally applied one to three threads back from the end of a fastener to assure ease of starting.
  • Indefinite on part life under ideal storage conditions [+40°F (+4°C) to +90°F (+32°C)], but re-certification must occur once a year.
  • As with all our Pre-Applied products, ND Industries can apply ST-3 to your fasteners at any one of our regional service centers, or we can supply you with completed pre-applied fasteners.

ST-3 Competes With

See technical data table below for full comparison listing

Applications

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

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.Blind Rivets, Break Stem Open Rivets, Closed-End Rivets, Easy-Entry Rivets, Grip Tite™ Rivets, High-Retention Rivets, High-Strength Rivets, Load Spreading Rivets (lsr), Micro Rivets, Multi-Grip Rivets (mgr), Open-End Rivets, Pull-Thru Rivets, Soft-Set Rivets, Tri-Fold Rivets, Ultra-Grip Rivets, Vgrip® Rivets, Grooved Rivets, Peel Rivets, Steel T Rivets, TVD Rivets, Interlock Rivets, Klik-Lok Rivets, Bulbing Rivets, Domed and Flat Head Solid Rivets, Low-Profile Domed Head Solid Rivets, Countersunk Head Solid Rivets, Mil. Spec Solid Rivets.

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

ProductColorCompetes WithTextureLubricityTemp MinTemp Max
ST-3-WWhite3M® Fastener Adhesive 4291, Tectorius® Tec-Seal™ 4291SoftHigh-65°F (-54°C)370°F (187°C)
ST-3-L3White3M® Fastener Adhesive 4291, Tectorius® Tec-Seal™ 4291SoftHigh-65°F (-54°C)370°F (187°C)
ST-3-L4WhiteNylok® Precote® 5, omniTECHNIK® Precote 5®, Tectorius® Tec-Seal™ PC-5, Bradley Coatings® Thread Sealer 40Medium0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L5WhiteLoctite® Vibra-Seal® 503, Tectorius® Tec-Seal™ 503Hard0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L5AWhiteLoctite® Vibra-Seal® 503HVHard0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L6Burnt OrangeLoctite® Vibra-Seal® 516, Tectorius® Tec-Seal™ 516Hard0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L7Burnt OrangeLoctite® Vibra-Seal® 517, Tectorius® Tec-Seal™ 517Hard0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L8WhiteLoctite® Vibra-Seal® 503 modMedium0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L8AWhiteLoctite® Vibra-Seal® 503HV modMedium0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L9Burnt OrangeLoctite® Vibra-Seal® 516 modMedium0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L10Burnt OrangeLoctite® Vibra-Seal® 517 modMedium0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L11BlueLoctite® Dri-Seal® 506, Tectorius® Tec-Seal™ 506Med-Hard0.11-0.13-65°F (-54°C)350°F (180°C)
ST-3-L13WhiteLoctite® Dri-Seal® 513, Tectorius® Tec-Seal™ 513SoftMedium-65°F (-54°C)370°F (187°C)
3M™ is a trademark of 3M Company Corporation, USA.  Tec-Seal™ is a trademark and Tectorius® is a registered trademark of Maelstrom Chemical Technologies, LLC DBA Tectorius, USA.  omniTECHNIK®, Precote®, and Precote 5® are registered trademarks of Omnitechnik, Mikroverkapselungs GMBH LLC, Germany. Nylok®, is a registered trademark of Nylok LLC, USA. Loctite® and Vibra-Seal® are registered trademarks of Henkel Corporation, USA.

Specifications

Particular formulations of ST-3 meet or exceed the performance requirements of the following specifications and/or standards:

Spec ForSpec NumberND ProcessND Material
Bendix (Allied Signal)BW-317-PST-3ST-3-L5, ST-3-L6
Briggs & StrattonGM TYPE A (9985473)ST-3ST-3-L5, ST-3-L5A
Briggs & StrattonGM TYPE AA (9985490)ST-3ST-3-W
Dana8M-30ST-3ST-3-L7
Dana8M-34ST-3ST-3-L7
Dana - Boston WeatherheadMS-71ST-3ST-3-W, ST-3-L8, ST-3-L13
Dana - Boston WeatherheadPS-5040ST-3ST-3-W, ST-3-L8, ST-3-L13
Detroit Diesel80K14ST-3ST-3-L10
Detroit Diesel80K15ST-3ST-3-L6
Detroit Diesel9S421ST-3ST-3-L10
Detroit DieselTPS 12635ST-3ST-3-L6, ST-3-L7
Fiat ChryslerMS-CD16ST-3ST-3-W
Fiat ChryslerMS-CD914 TYPE AST-3ST-3-L5, ST-3-L7
Fiat ChryslerMS-CD914 TYPE BST-3ST-3-L5A, ST-3-L6
FordES-379570-S100ST-3ST-3-L5
FordESA-M4G208-A1ST-3ST-3-L5
FordESA-M4G208-A2ST-3ST-3-W
FordEST-M4G208-B1ST-3ST-3-L6
FordEST-M4G208-B2ST-3ST-3-L7
FordWSK-M4G328-A1ST-3ST-3-W-A
FordWSK-M4G328-A2ST-3ST-3-L5
FordWSK-M4G328-A3ST-3ST-3-L7
FordWSK-M4G328-A4ST-3ST-3-11
FordWSK-M4G328-A5ST-3ST-3-L6
FordWSK-M4G328-A6ST-3ST-3-W-C
FordWSS-M18P12-AST-3ST-3-W
FordWX-201ST-3ST-3-W
General Motors9985473ST-3ST-3-L6
General Motors9985490ST-3ST-3-W
General Motors9985490ST-3ST-3 Type 1
Index Sensors & ControlsIndex Item number 4014004ST-3ST-3-L9
John DeereRES 10059ST-3ST-3-L5A, ST-3-L6, ST-3-L5, ST-3-L7
Mack Truck023 GS 17002ST-3ST-3-W
Mack Truck3/6AXS7ST-3ST-3-W
Mack Truck617GS135ST-3ST-3-W
Mack Truck64AMS1ST-3ST-3-W
Meritor (Rockwell)Q-56ST-3ST-3-L6
NavistarCEMS D-31ST-3UNK.

Safety, Technical & Product Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Product Data Sheet
ST-3®ST-3-L3ST-3 - PDS
ST-3®ST-3-L4ST-3-L4 (Applied)ST-3 - PDS
ST-3®ST-3-L5ST-3 - PDS
ST-3®ST-3-L5AST-3 - PDS
ST-3®ST-3-L6ST-3-L6 (Applied)ST-3 - PDS
ST-3®ST-3-L7ST-3-L7 (Applied)ST-3 - PDS
ST-3®ST-3-L8ST-3 - PDS
ST-3®ST-3-L8AST-3 - PDS
ST-3®ST-3-L9ST-3 - PDS
ST-3®ST-3-L10ST-3 - PDS
ST-3®ST-3-L11ST-3 - PDS
ST-3®ST-3-L13ST-3-L13 TDS (Applied)ST-3 - PDS
ST-3®ST-3-WND3254ST-3 - PDS
Increase product quality while saving time and money with Pre-Applied adhesives and sealants.