The STD-213 seal is an aerospace / engine oil seal (radial lip-type seal) commonly used in aircraft piston engine applications, particularly in systems related to fuel pumps, accessory drives, or rotating shaft sealing points.

It is part of a standardized aviation seal size family where “213” refers to a dimensional standard (AS568 / industrial cross-reference sizing in many seal catalogs) rather than a single manufacturer-specific design. In aviation parts catalogs (e.g., Lycoming/Continental aftermarket systems), STD-213 is often used as a replacement oil seal for rotating shafts to prevent oil leakage while maintaining low friction operation.

Key features include:

Aircraft-grade radial lip oil seal
Used in engine accessory sections (fuel pumps, drives, shafts)
Designed to retain oil and exclude contaminants
Typically nitrile (Buna-N) or Viton elastomer construction (variant dependent)
Compatible with rotating shaft applications under pressure and heat
Standardized “213” size used across multiple aviation seal systems
Resistant to aviation oils, hydraulic fluids, and temperature cycling
Common in piston engine maintenance and overhaul kits