Scope—This standard is for cutting edge sections typically used in earthmoving machinery defined in SAE J1507:a. Tractor - Scrapers as defined in SAE J728.b. Dozers as described in SAE J729 and J173.c. Loaders as described in SAE J731.d. Graders as described in SAE J870.Hole spacing is defined for dozers and scrapers in J737 and graders in J739. Hole conformation is defined in J740.This standard specifies dimensions for cutting edge cross section.