Parker Lock-O-Seals™

800 Series Lock-O-Seals


  • Seal beneath the head of a fastener
  • Separately molded O-ring fitted within a surrounding metal washer

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-O-Seals 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



The part numbers for many of Parker fastener seals have changed since their implementation over 40 years ago. As a convenience to our customers the charts below can be used as a reference to convert obsolete part numbers, which may be specified on prints, part lists or other documentation, into the current part number. If you have an obsolete part number not listed, please contact the Composite Sealing Systems Division for assistance in making the conversion.


Download the Warranty

This warranty comprises the sole and entire warranty pertaining to items provided hereunder. seller makes no other warranty, guarantee, or representation of any kind whatsoever. All other warranties, including but not limited to, merchant ability and fitness for purpose, whether expressed, implied, or arising by operation of law, trade usage, or course of dealing are hereby disclaimed. Notwithstanding the foregoing, there are no warranties whatsoever on items built or acquired wholly or partially, to buyer’s designs or specifications.

Limitation of remedy: Seller’s Liability arising from or in any way connected with the items sold or this contract shall be limited exclusively to repair or replacement of the items sold or refund of the purchase price paid by buyer, at seller’s sole option. In no event shall seller be liable for any incidental, consequential or special damages of any kind or nature whatsoever, including but not limited to lost profits arising from or in any way connected with this agreement or items sold hereunder, whether alleged to arise from breach of contract, expressed or implied warranty, or in tort, including without limitation, negligence, failure to warn or strict liability.

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