ST-3 is a pre-applied process whereby a series of resilient thread sealants are coated onto straight or tapered threaded fasteners. A widely-used automotive industry approved process, ST-3 creates a custom-fit elastic gasket around fastener threads which prevents the passage of most fuels and chemicals, and helps keep joints tight under severe vibration.
During the ST-3 pre-application process, ND Industries accurately dispenses a select range of materials onto fasteners, making them self-sealing. The applied sealants act as a partial lubricant, reducing torque tension variation and preventing the galling of metals. They will not harden or cure, allowing fasteners to be adjusted, removed, and replaced, throughout the life of the part if needed. Processed fasteners arrive to the customer dry to the touch, and ready for immediate assembly.
ST-3 creates fasteners which provide an instant seal of over 2000 psi on both straight and tapered threads. Contains PTFE to help with lubricity and sealing.
The materials applied through the ST-3 process are non-hardening with lubricating properties, making fasteners easy to adjust, remove, and reuse.
Although ST-3 processed fasteners are primarily for sealing, they also provide a limited amount of resistance to vibrational loosening and thermal shock resistance through a wide range of temperatures.
Materials used in the ST-3 process are non-hazardous, non-flammable, and will not migrate into fluid systems like paste or tape sealants.
Sealants applied in ST-3 processing are resistant to corrosion from brine, chlorine, acids, and alkalis. They effectively resist natural gas, butane, propane, motor fluids, and other chemicals.
ST-3 processing inhibits corrosion between mating fasteners which prevents seizing and allows for easy removal.