800 Series Lock-O-Seals

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. Lock-OSeals
are recommended for use instead of 600 series
Stat-O-Seals under the following circumstances:
(1) To seal bolts, studs, or other fasteners in the small
and miniature sizes specifically #2, #4 and #5
(2) The elastomer, retainer material or combination of
both is not offered as a 600 Series Stat-O-Seal