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3M™ Thread Sealant 4291

Photo: 3M™ Fastener Adhesives family of specialized parts
Photo: 3M™ Fastener Adhesives family of specialized parts
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.
  • Synthetic polymer chemistry allows for an extended shelf life, excellent resistance to automotive fluids, high temperatures and pressures
  • Designed to be used on both pipe and straight threads, providing more robust sealing performance
  • Flow-coatable formula allows controlled application to fasteners so that viscosity can be adjusted to achieve target coating weights, providing broad handling, dispensing and drying windows for the applicators
  • Bonds to a broad range of fastener finishes
  • Water-based product - no VOCs.
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Key Attributes


ApplicationsSecuring threaded fasteners in the engine compartment
Form TypeFlowable Liquid
Manufacturing SegmentChassis and Wheels, Powertrain
Maximum Service Temperature149°C (300°F)
Shelf LifeBulk adhesives storage: 6 months from date of receipt by customer when stored at 15°C- 27°C (60°F- 80°F). Rotate inventory on FIFO (first-in, first-out) basis. Coated Fasteners: 1 year from date of adhesive application when stored at 4°C- 38°C (40°F- 100°F)
Solids Level59%