The pattern of a knurl: straight grooves (DIN 82 RAA), helical grooves turning left (RBL) or right (RBR), or both crossing in a raised diamond (RGE); ASME B94.6 names the helical ones diagonal.
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The pattern of a knurl: straight grooves (DIN 82 RAA), helical grooves turning left (RBL) or right (RBR), or both crossing in a raised diamond (RGE); ASME B94.6 names the helical ones diagonal.