This specification covers one type of continuous multifilament carbon (graphite) fibers in the form of a tow or yarn (when twisted). The weight per unit length of the tow or yarn is governed by the filament count which is identified by the supplier's grade or material designation.
SAE AMS3892/5A-2011 history
2011SAE AMS3892/5A-2011 TOW OR YARN, CARBON (GRAPHITE) FIBERS For Structural Composites GF 220 (1515) Tensile Strength, 75 (517) Tensile Modulus