Under Head Sealant (Resistant To Automotive Fluids)

NYSEAL® creates a gasket-type seal, preventing leakage of fluids and gases under pressure. The coating is permanently fused on the bearing surface of the fastener. As the screw is seated to its final position against the mating part, the NYSEAL® element compresses slightly and fills the void between the bearing surface of the head and the counter sink/counter bore.


  • Eliminates time-consuming, in-house applications of O-rings, gasket seals and sealant compounds
  • Permanently bonded to the bearing surface
  • Eliminates the leak path
  • Prevents galvanic corrosion between dissimilar materials
  • Reusable

Technical Data

  • Color — green (special colors available upon request)
  • Resistant to most chemicals: alcohol, gasoline, oil, kerosene, diesel fuel and hydraulic fluids
  • Temperature Range: -40 C (-40 F) to +66 C (+150 F)
  • Can be applied to virtually any headed fastener
  • Shelf-Life indefinite


download file icon Nyseal® RoHS / WEEE Compliance Material Declaration for Nylok Nyseal®

Manufacturing Specs