The 800 Series Lock-O-Seal is a two piece combination seal comprised of a separately molded O-ring fitted within a surrounding metal washer. These Lock-O-Seals are intended to seal beneath the head of a fastener.
800 Series: Intended to seal immediately under the head of a bolt
Ideal for sealing small and miniature sizes
Special material combinations not available as a 600 Series Stat-O-Seal